Power & Solar

Battery Bank

Type: ECO-WORTHY Cubix100 48V 100Ah Server Rack Batteries
Quantity: 3
Total capacity: 3 x 100Ah @ 48V = 14.4 kWh
Age: New (install pending)

Solar Array

Panel count: TBD
Wattage per panel: TBD
Total wattage: TBD
Controller type: TBD

Inverter

Wattage: 5kW
Type: TBD (pure sine expected)

Shore Power

Hookup amp rating: 30A
Generator: WEN DF1100T (owned) — see Generator-Assisted Power below

Generator-Assisted Power (WEN DF1100T — owned)

Architecture: generator → ECO-WORTHY charger → 48V bank → 5 kW inverter → 120V AC. The gen is a bank-charger, NEVER a direct electronics source.

Holds the plan on long/high-load days (AC + trike + base loads), rebuilds the bank, and enables all-day AC when solar alone can’t. Solar demotes to fuel-saver + quiet-hours backup. 2026-09 decision from the owner’s existing unit — no gen purchase needed.

Verified specs (generatorbible, wenproducts, 2026-09)

Hard rules (non-negotiable)

THD <15% — never direct-connect electronics (Starlink, laptop, TV, phone chargers) to the gen. Route gen → ECO-WORTHY charger → bank → inverter; the inverter re-synthesizes clean 120V. [VERIFY] ECO-WORTHY charger tolerates non-inverter gen input (most LiFePO₄ chargers do; confirm against the charger’s input spec / manufacturers’ gen guidance before relying on it).
Never run it inside/attached to the bus — no CO sensor; exhaust into bus AC intakes = CO death. Ground it, place it downwind ≥20 ft from bus openings, never under a window with the bus running.
Fuel + fumes stay off the bus — gen + cans live on the trailer, not in the living space (see ARCHITECTURE.md §Storage). Gas drained or stabilized + vents cracked for trailer storage.
Playa/desert dust kills open-frame gens: air-filter/cleaner discipline, dust cover, fuel stabilizer, vibration lash-down. Budget post-event maintenance.

Daily operating pattern

2–3 hr/day bank-charge run in one lane: gen charges bank at charger rate while the inverter may also feed AC/trike charger (gen output dwarfs bus draw; 8,300W surge / 4,600W continuous vs ~2–4 kW typical). Bank rest-of-day from solar + stored energy.
Wire gen’s L5-30R → bus 30A shore inlet — one cable, full house power (matches the plan’s 30A shore inlet rating). Gen’s L5-30R is the 30A shore inlet on the gen’s 14AWG 120V duplex outlet.
Rough fuel: ~1.5–2 gal/day at realistic ~1.5–2 kW draw. Propane = clean storage/no stale gas but 3 hr/20-lb tank burns money; gas preferred for runtime, stabilize it.
Runtime limit 8.5 h/tank ≈ 3–4 gen-days per fill.
Listen-hours/no-gen venues (BRC quiet hours, BLM restrictions): gen off, solar + bank carry. Some trips = gen stays home, solar covers (that’s the 600–800W array’s job).

Solar re-sizing (replaces earlier ~1,000–2,000W guidance where the gen is carried)

With gen: array target drops to ~600–800W — fuel-saver + quiet-hours/no-gen-day coverage, not the primary daily harvest.
Without gen (trips it stays home): the ~1,000–1,200W (gear stack) / ~1,500–2,000W+ (AC mainstay) numbers from below still hold.
Treat the two regimes as distinct, same as the 300–400W Starlink-only line below.

Daily Power Budget

Consumption: TBD
Generation: TBD

Install Notes

Solar quote tracker (2026-09-24): see Solar Quotes — bid comparison in progress (bid 1 = $16k, market target $8.5–13k), regime-pinned array decision pending (default gen-carried → ~600–800W), install ordered AFTER mechanical repairs + interior frame (rough-in coordination). Purchase pending deposit gates.
Solar package installation pending
Verify inverter/controller compatibility with ECO-WORTHY Cubix100 batteries
Confirm charge controller supports 48V bank with 3x100Ah configuration
Gear-stack solar sizing (from destinations/event-gear/ARCHITECTURE.md §Update the Power Budget Spreadsheet): the full 5-item gear stack (e-trike + drone + RC + LED kite + 24” TV) pushes the lifestyle to ~30–42% of the usable bank/day (~3,500–4,850 Wh/day including base loads fridge/Starlink/lights/laptop). Solar needs to be sized for ~4,000–5,000 Wh/day generation, which means ~1,000–1,200W array, NOT the old 300–400W estimate in the “Power Draw Tracking” section below. Reference point: an 800W array on playa recovered ~4,900 Wh/day in a documented 2024 burn (sunlightandpower.com, cited in ARCHITECTURE.md). Treatment: the 300–400W figure below is the Starlink-only sizing; the full gear-stack needs ~1,000–1,200W — keep these numbers distinct. Generator revision (2026-09): with the owned DF1100T in the stack, the ~1,000–1,200W (gear stack) / ~1,500–2,000W+ (AC mainstay) targets are the no-gen sizing. With the gen carried (2–3 hr/day bank-charge runs), solar drops to a ~600–800W fuel-saver / quiet-hours backup — gen covers high-load days (AC, trike) and rebuilds the bank; solar trims fuel. See Generator-Assisted Power.
48V→12V DC rail (Victron Orion-Tr 48/12-30, 360W, 87% eff, <80 mA no-load) — recommended add from event-gear research as the highest-leverage change in the plan. Anything ≤400W that can run on 12V goes on the rail (TV, USB-PD chargers, LiPo balance chargers, LED lights, drone car charger); the 5 kW inverter is for 120V-only loads (fridge, e-trike AC charger). Microwave and coffee maker are not in the plan — cooking/heating uses propane (stove, propane heater); both are dropped from the budget and the inverter draw is not part of the plan. Saves ~60–150 Wh/day vs inverter path on the TV alone, removes a failure point, and eliminates the inverter’s 20–50W idle tax. Gates: confirm rail amp budget vs audio/fan loads you add. The Orion is a converter (constant-voltage output), NOT a battery charger — do not use it to directly charge the e-trike battery (48V→54.6V needs a charger algorithm; DIY boost = fire risk, BMS comms void). E-trike charges only via stock AC charger → inverter. [VERIFY] actual inverter idle draw once installed; log 30 days per power-supply.md practice.

📡 Starlink Internet Setup (Remote Work)

Hardware Model & Power Specifications

Model	Active Draw (W)	Idle Draw (W)	24h Energy (kWh)	Notes
Starlink Mini	25-40 W	18-22 W	0.60-0.96 kWh/day	Runs on USB-C PD; 100W (20V/5A) recommended; smallest footprint
Standard Gen 3 (V4 Kickstand)	75-100 W	20-25 W	1.8-2.4 kWh/day	Most common RV model; Wi-Fi 6 router adds 12-15W; no native DC input
Standard Actuated Gen 2 (Legacy)	50-75 W	45 W	1.2-1.8 kWh/day	Motorized mast; proprietary 48V PoE; snow melt adds 50-70W
Flat High Performance	110-150 W	45-55 W	2.6-3.6 kWh/day	Highest power draw; dedicated external PSU; 200-300 Ah battery needed
Starlink Enterprise	110-160 W	50 W	2.6-3.8 kWh/day	AC supply standard; commercial/heavy use
Starlink V5 (July 2026)	35-50 W	N/A	~0.84-1.2 kWh/day	Most efficient fixed-install dish; ~half V4’s draw

Daily Energy Consumption Scenarios

Usage Profile	Hours/Day	Avg Draw (W)	Daily Wh	3-Day Battery Needed (Wh)	Solar Panel Needed (W)
Light / Email only	4	30 W	120 Wh	360 Wh	60 W
Moderate / Video calls	8	50 W	400 Wh	1,200 Wh	120 W
Heavy / Streaming + work	12	75 W	900 Wh	2,700 Wh	180 W
Continuous 24/7	24	75 W	1,800 Wh	5,400 Wh	360 W

Critical Power Considerations for Remote Work

1. Inverter Efficiency Tax

Starlink runs on AC (via power supply); your batteries are DC
Typical inverter efficiency: 85% modern, 80% older
Rule: If Starlink needs 75W, battery actually drains at ~88W (75W ÷ 0.85)
Extra 13W lost as heat over 8-hour workday = 104Wh lost energy

2. Boot/Surge Power

Startup surge: 90-110W for Gen 2 actuated, 75-90W for Gen 3
Critical: Power source must handle surge without browning out
Recommendation: Size battery/inverter for 1.5x normal draw during boot

3. Idle Draw is NOT Zero

Starlink remains active 24/7 to maintain satellite handoffs
Idle draw: 18-55W depending on model (even when “not in use”)
Overnight drain: 8 hours idle = 144-440 Wh (significant for battery!)
Recommendation: Use Starlink app “Sleep Schedule” or physically power off overnight

4. Cold Weather / Snow-Melt Impact

Snow-melt mode can add 50-100W+ during cold conditions
Frequent re-connections (rain, clouds, obstructions) increase draw
Rule of thumb: Add 20-30% to consumption in winter conditions

5. Wi-Fi Router Additional Draw

Starlink router/mesh nodes: 12-15W (Gen 3) or more
Include in total: Starlink dish + router = combined draw
Ethernet connection: Can reduce router draw if devices wired directly

Battery & Solar Sizing for Starlink + Remote Work

Baseline Calculation (Gen 3 Standard, 8h work + 8h idle daily)

Daily Starlink consumption:
  • 8 hours active @ 75W = 600 Wh
  • 8 hours idle @ 25W = 200 Wh
  • 8 hours sleep/off = 0 Wh (if powered down)
  • --------------------------------
  • Total: 800 Wh per day

With inverter loss (85% efficiency):
  • 800 Wh ÷ 0.85 = 941 Wh actual battery draw

3-day cloud buffer (recommended for remote work):
  • 941 Wh × 3 = 2,823 Wh

LiFePO₄ battery sizing (80% DoD usable):
  • 2,823 Wh ÷ (48V × 0.80) = 73.6 Ah @ 48V
  • **Recommendation**: 3x 100Ah 48V batteries (your existing bank = 14.4 kWh total)
    → This gives you 48 kWh total, which is MORE than enough for Starlink + work

Solar panel sizing (assuming 4 peak sun-hours/day):
  • 941 Wh ÷ 4 h = 235 W minimum
  • **Recommendation**: 300-400 W array for clouds/angles + other loads

Your Existing Battery Bank Assessment

3 × ECO-WORTHY Cubix100 48V 100Ah = 14.4 kWh total capacity
Usable (80% DoD): ~11.5 kWh
Starlink daily consumption: ~0.8-1.5 kWh (depending on model/usage)
Your battery bank supports ~8-14 days of Starlink-only use before recharging
With solar: 300-400W array will fully replenish Starlink usage + other loads in 1 day

Portable Air Conditioner (SereneLife SLPAC10 / B07DQSNMWX — 10,000 BTU, R-32, non-inverter)

2026-09 research update — see Air Conditioning for the full off-grid AC decision. Bottom line: the SereneLife stays as shore-power-only backup. The recommended primary off-grid unit is a Midea 12K U-shaped inverter window AC (MAW12U1QWT, CEER 15.2, R-32, ~$509) in an 80/20 window panel — ~2× the efficiency per cooling hour (~0.45–0.6 kWh/hr vs this unit’s 0.7–1.0), no roof cut (roof stays free for solar), removable for travel, and it seats into the window-panel system in insulation-frame.md. Planning number for trip math after install: ~0.5 kWh per cooling hour. If AC becomes a mainstay load (4+ hrs/day), the solar target rises from ~1,000–1,200W to ~1,500–2,000W+ — unless the owned DF1100T generator is carried, in which case solar stays ~600–800W (fuel-saver) and the gen does the heavy day (gen → ECO-WORTHY charger → bank → inverter; all-day AC becomes bank-free-ish for the gen-run hours). See Generator-Assisted Power. SereneLife’s VERIFIED specs below remain accurate for the unit as owned; its role in the plan is demoted.

Verified (this session, retained for the SereneLife as-owned): 10,000 BTU portable AC + dehumidifier + fan, R-32 refrigerant, non-inverter rotary/scroll compressor, 120V AC only (1150W rated), SEER 10.5, ~55 lb, 52 dB, single 59” corrugated exhaust hose + rectangular window sealing kit, Wi-Fi + remote, washable double-layer filter, manual + auto drainage, 4.3 ft power cord, rated 450 sq ft / 3600 cu ft, no inverter compressor. Not separately verified this session: real-world point-in-time wattage in your bus conditions (the listed 1150W is the rated/max figure; the SEER-derived cooling envelope below is a planning estimate). Measure on the bus with a plug-in wattmeter (or inverter output meter) before relying on any hour/Wh number.

What this unit actually is (install reality, not marketing): it is a window-installation portable AC, not a self-contained floor unit. It cools by pumping heat out a single 59” corrugated exhaust hose that must be sealed to the outside via the included window kit (the kit is sized for a ~59”-open window); the spec sheet lists “Window Opening Min/Max 59 in × 59 in,” “Outdoor Unit Compatibility: Requires New Outdoor Unit,” and “Exhaust Hose: Flexible corrugated.” Without that hose sealed to the outside, the unit pumps its condenser’s hot exhaust air right back into the bus and makes the interior hotter, not cooler — there is no “roll it in and turn it on” path. On the bus, that means fabricating a window/vent mount for the hose + kit; that’s the install task.

Why the AC is a different kind of load than the fridge:

The fridge is a small, 24/7-compressor, dual-voltage (12V/24V + 100-240V) load that can run on a 12V rail and avoid the inverter entirely if the rail exists. The AC is a 120V-only, non-inverter, ~700-1,000W-while-running compressor load that can only run off the 5 kW inverter (or shore/generator 120V) — there’s no DC mode, no rail path. The fridge’s daily Wh is a budget assumption (it’s on all the time); the AC’s daily Wh is an optional, hours-limited comfort load you decide to spend bank Wh on.
Cooling is the second-biggest potential inverter load in the plan after the fridge, but unlike the fridge it’s not “always on.” It’s “run for N hours when you want the bus cooler.” That’s why the framing is bank-hours-limited comfort, not baseline load.
Single-hose portable = negative pressure: the unit exhausts air out and pulls replacement air in from wherever it can (bus gaps, door seals, any opening) — so it can pull hot outside air in around the seals and work against itself. In a well-sealed bus cavity it’s less bad, but it’s the inherent limitation of a single-hose portable (dual-hose units avoid this; this unit isn’t one).

Power envelope (planning — measure for real): || Mode | Compressor | Est. draw | Rate | Notes | ||—|—|—|—|—|—| || Fan-only (cooling off, just blower + fan) | Off | ~30-70 W | ~0.03-0.07 kWh/hour | Cheap air movement; still inverter-from-bank in practice (the AC’s fan is wired to the 120V board — no 12V rail path without hacking the unit’s internals; don’t do that) | || Cooling, temperate load, shaded/at-temp bus, good seal | Cycling, 10,000 BTU / SEER 10.5 envelope | ~700-1,000 W while compressor runs; ~1150W spikes at start/hot-load | ~0.7-1.0 kWh per cooling hour | Duty cycle depends on ambient/insulation/seal quality; a single-hose portable in a 450 sq ft insulated space at 90-100°F ambient runs a large fraction of the time | || Dehumidifier mode | Cycling (compressor) | Similar to cooling, often comparable or slightly higher per runtime | ~0.7-1.0 kWh/hour-ish | Pulls water; auto-evaporate handles some, high humidity may need manual drain | || Worst case (hot bus, poor seal, door openings, trying to cool a hot mass down fast) | Running a lot | >1,000 W, high duty | >1 kWh/hour | Don’t plan to this; “user error + heat + bad seal” territory |

Use fan-only (~30-70W, ~0.03-0.07 kWh/hour) as the “air movement” option and ~0.7-1.0 kWh per cooling hour as the planning number for cooling hours, with the understanding that a hot dirty bus with a bad seal will run higher. These are the numbers to design cooling-hours-against-bank around; the 1150W rated figure is the spike/start figure, not the steady average.

Battery bank reality (48V, 3× ECO-WORTHY Cubix100, 14.4 kWh, ~11.5 kWh usable):

~750 Wh per cooling hour ≈ 6.5% of usable bank per cooling hour (750 ÷ 11,500). One hour of cooling = ~6.5% of the usable bank. Four hours of cooling = ~3,000 Wh ≈ 26% of usable bank — and that’s before fridge, Starlink, laptop, TV, lights, gear stack.
Bank-only cooling is not a sustainable off-grid baseline for this bus. Even 1-2 hours is a real chunk of the bank; 4+ hours is a drain the 300-400W (Starlink-only) or even 1,000-1,200W (full gear-stack) solar can’t silently replenish on a bad sun day. Cooling via the bank is “cool the bus down for a couple hours before bed / cool a hot bus after you get back into it,” not “run the AC all afternoon off solar.”
On shore power / generator / campground 120V, the AC is bank-free — this is where the unit is actually at home. Plug into a 120V source, seal the window kit, run as long as the source allows; the bank doesn’t pay for it.
The AC is an optional comfort load, not a budget assumption. The baseline budget (~2,000-3,000 Wh Starlink-only; ~3,500-4,850 Wh full gear-stack per ARCHITECTURE.md) does not include AC cooling hours. If cooling hours matter to you, they get added on top of that and move the “how much solar / how big a bank / how many dry-camp days” conversation — because they do.

Inverter sizing (the AC is the inverter’s big AC load):

The 5 kW inverter can handle the AC on paper (1150W rated, non-inverter rotary/scroll compressor with inrush spikes above rated for a fraction of a second — well under the 5 kW headroom). The constraint is bank Wh, not inverter headroom.
Dedicated 120V circuit recommended for the AC when on AC — a 1150W unit on a marginal shared circuit with other loads can nuisance-trip; give it its own branch. The fridge + AC on the same inverter is fine for headroom (both are well under 5 kW combined); the question is bank Wh for however many cooling hours you run.
If shore/generator is present, use it directly and let the inverter rest for the AC’s runtime — bank-free cooling.

Install/location on the E350 bus (the real gating item, not the bank):

The exhaust hose + window kit must be sealed to the outside. Plan which bus opening you use (window, vent, cut panel) and build a seal for the 59” hose + rectangular kit to it. The included kit is for a ~59”-open window; on a bus you’re fabricating an equivalent seal to whatever opening you choose. This is the install task, and it’s mandatory for the unit to do anything useful.
Route the 59” hose so it doesn’t kink, pinch, or rub hot surfaces, and so the unit isn’t at the end of a stretched/compressed hose (the corrugated hose has a working length; don’t extend it with random hose — that’s a seal + airflow failure point). 59” is the hose length; plan the unit-to-opening geometry around that.
4.3 ft power cord — plan the 120V outlet location so the AC’s cord reaches without an undersized extension; a proper-rated 120V extension is OK if needed, but every foot of undersized cord is voltage drop + heat.
Footprint/weight: ~32”W × 17.5”H × 13.4”D (unit), 55 lb — portable with wheels but not light; dedicate a spot for it on the bus rather than moving it around daily. Measure the bus spot + the hose route + the seal location before expecting it to live there.
Condensate drainage: auto-evaporate handles some moisture, but in high-humidity cooling/dehumidify the unit pulls water and you may need to drain manually — plan where that water goes on the bus (tank, drain to outside, etc.).
Air intake is on the left side panel (per the spec) and the exhaust hose is on the rear — orient the unit so intake has some airflow and the hose routes cleanly out; don’t tuck the intake against a wall/curtain.

Heat interaction with the bus (the AC’s whole job is fighting bus heat, so this is the core operating reality):

The AC’s job is to remove heat you’ve let into the bus — so the biggest win is not letting heat in: shade the bus (awning, park in shade, reflective cover on the windshield/side windows), close up during peak heat, open up at night. The AC works a lot better cooling a bus that’s been shaded/kept closed than one baking in sun with the door open.
Single-hose exhaust seal quality is the single biggest operating variable. A well-sealed exhaust = the unit actually pumps heat out. A leaky exhaust = the unit fights itself and burns bank Wh for little cooling. Seal the window/vent mount carefully; check it each trip.
Pre-cool / cool-down strategy: run the AC for 1-2 hours from the bank when the bus is shaded / after you get back into a hot bus / before bed to drop the bus temperature, then let the sealed-shaded bus hold that coolth. That’s the realistic “bank-hours-limited” cooling use — cooling hours spent on a temperature drop, not on fighting ambient all day.
Dehumidify as a separate use: on a humid day, dehumidify mode can make a hot-humid bus feel more tolerable at a similar watt cost to cooling; it’s another optional bank-hours load.

R-32 refrigerant safety: R-32 is an A2L refrigerant — mildly flammable (lower flammability than R-600a’s A3, but still in the flammable family). Standard in modern ACs and safe in normal operation. Never dent/puncture/kink the refrigerant loop; don’t use the unit as a step or lean on it; if the cabinet is dented hard enough to suspect a line hit, stop using it and get it inspected. Handle like the fridge’s R-600a note: safe in operation, risk only on line breach.

Measure-back / trip-1 practice (same discipline as the fridge and Starlink):

Bring the AC’s actual draw back to this file after trip 1: plug-in wattmeter (or the inverter’s output meter) logging fan-only, cooling in a hot bus, cooling in a shaded/at-temp bus, and dehumidify — in the real bus conditions with your actual seal. Update this section + the spreadsheet’s AC row with the measured Wh/hour for each mode, and with the measured cooling-hours-against-bank number you actually get before the bus stops feeling comfortable.
Until then, ~0.7-1.0 kWh per cooling hour (cooling), ~0.03-0.07 kWh/hour (fan-only), and “bank-hours-limited comfort, not baseline” are the planning numbers.

Comparison framing (AC cooling vs the rest of the comfort/power picture):

AC cooling from the bank = the most bank-intensive comfort option. Good for situational cool-downs (1-2 hours shaded, or cooling a hot bus back down), not for all-day cooling off solar. Adds to the “need more solar / bigger bank / fewer dry-camp days” conversation if you run it a lot.
Shore/generator cooling = the AC’s natural home. Bank-free, as long as the 120V source holds. If you camp where 120V is available, the AC is a comfortable no-bank-cost option.
Fan-only + shade + sealed-up + night cool-down = the low-bank-cost comfort strategy: shade the bus, keep it closed in peak heat, run fan-only or short cooling bursts from the bank, cool down before bed. This is the strategy that stays within the baseline budget; the AC’s all-day cooling does not.

Verified (this session): This unit is a dual-voltage R600a compressor fridge rated AC 100-240V / DC 12V/24V, rated power 45W~65W, rated current 4.6A / 5.5A (4.6A @ 12V ≈ 55W, inside the 45-65W band; 5.5A likely @ 24V ≈ 132W or a different duty condition — treat 45-65W as the rated-power anchor). Not separately verified this session: exact capacity cu ft, dimensions, noise, Energy Star status, brand for this exact SKU — Amazon’s product page is bot-walled. The DC/AC dual-voltage + 45-65W + R600a profile is the verified part; everything else is the typical profile for a dual-voltage 12V/24V R600a compressor compact of this class. Measure on the bus with a plug-in wattmeter for 30 days before relying on any Wh/day number.

Why this fridge’s dual-voltage DC capability matters for the bus (it changes the framing from the earlier “AC-only fridge” writeup):

The E350 house bank is 48V (3× ECO-WORTHY Cubix100, 14.4 kWh, ~11.5 kWh usable). This fridge is nominally a 12V/24V DC fridge, NOT a 48V fridge. To run it off the 48V bank on DC you need a 48V→12V (or 48V→24V) DC-DC converter on the way. The gear research’s recommended Victron Orion-Tr 48/12-30 (360W, 87% eff, 12.2V regulated out, <80 mA no-load) is exactly the right part: 55W fridge draw ÷ 0.87 ≈ 63W from the 48V bank, ~0.5A @ 48V — trivial for the Orion’s 30A / 360W rating, and the fridge becomes a clean 12V rail load with no inverter.
On 12V DC (via the 48V→12V rail) the fridge avoids the inverter entirely — no inverter conversion tax, no inverter idle overhead. This is the “highest-leverage” logic the gear research applies to the TV: the load that’s on 24/7 (the fridge) is the one where avoiding the inverter matters most, and this fridge is DC-capable so it CAN avoid the inverter. That makes it a better bus fit than an AC-only fridge, provided the bus actually has the 12V rail (or a chassis 12V that’s alive when you want the fridge on).
On shore power / generator / 110-240V campground hookup, the fridge runs off the wall directly — AC cord, no rail, no inverter from the bank. Same as any 110-240V appliance.
Bottom line on the “inverter idle tax”: with this fridge, the inverter idle tax only applies when the fridge is running on 120V AC via the inverter (i.e., when the bus is off-grid AND there’s no 12V rail, so the fridge runs off the inverter from the 48V bank). If the bus has a 48V→12V rail, the fridge runs on the rail and the inverter stays off for the fridge’s entire life. That’s the good case. If there’s no rail, the fridge is the load most likely to make inverter idle real — same as the earlier writeup, except this fridge is DC-capable so the fix is “add the rail,” not “swap the fridge.”

Daily Wh envelope (planning — measure for real): || Condition | Compressor rated | Est. daily Wh | Notes | ||—|—|—|—|—|—| || Temperate bus (60-80°F cab, door closed, pre-chilled load, food at temp) | 45-65W running | ~300-650 Wh/day | Dual-voltage DC compressor units in this class are typically efficient; this is the best-case planning band | || Desert/bus heat (90-100°F cab, warm food in, door openings, condenser dusty) | 45-65W running | ~500-1,000 Wh/day | Heat is the fridge’s enemy — duty climbs with ambient; a dusty condenser makes it worse | || Worst case (hot cab, door left open, warm load, dusty condenser, freezer mode) | 45-65W+ running | >1,000 Wh/day | Do not plan to this; “user error + heat + dust” territory |

Use ~400-700 Wh/day as the planning number for trip math with a well-run temperate bus; note that a hot dusty desert bus can push it toward 1,000 Wh/day if the condenser isn’t kept clean and door discipline is loose. These are 30-40% lower than the earlier AC-only fridge writeup’s 500-900 range because the dual-voltage unit’s rated 45-65W is lower than the 60-90W the AC-only writeup assumed — but the heat/dust caveats still apply unchanged.

DC-side wiring (the interesting part for this bus):

A 48V→12V converter is required to run this fridge off the 48V bank on DC. The fridge’s 4.6A @ 12V is the fridge’s draw; the converter supplies that at ~63W from the 48V side (÷0.87). Size the converter for the fridge plus any other 12V rail loads you put on it (TV, USB, drone/RC chargers — those are the gear-research rail loads). The Orion-Tr 48/12-30 handles it easily.
Fuse and wire the 12V fridge circuit properly. 4.6A @ 12V is small, but compressor inrush can spike; use a properly-rated inline fuse on the 12V feed to the fridge (fridge manufacturer’s recommended fuse size if given, else a sensible overcurrent device on a 55W load — a 10-15A fuse is typical for a 4.6A-rated load with inrush margin; verify against the fridge’s spec/label). Keep the 12V wiring short and adequate-gauge between converter and fridge; voltage drop on a long undersized 12V run is the failure mode here, not the converter.
Confirm the fridge’s DC plug/terminal type before wiring — dual-voltage fridges sometimes come with a DC barrel plug, sometimes terminals, sometimes a cigarette-lighter plug (for 12V car use). If it ships with a 12V cigarette-lighter plug, the “cigarette lighter” socket on the bus is a 12V outlet you’d feed from the rail — make sure that outlet is on the rail (or chassis 12V) as intended, and that it’s fused.
Verify the fridge tolerates the rail voltage. The gear research specifically warns about wide-input on a regulated rail: a fridge that expects a vehicle 12V system can see 13.5-14.4V from an alternator/charging bus and cook its electronics; the Orion rail holds 12.2V regulated, which mitigates that risk, but confirm this fridge’s DC operating-voltage range from its label/spec (a “12V/24V” dual fridge usually tolerates a wide 12V range like 10-15V, but verify — don’t assume). [VERIFY] the exact DC voltage range on the fridge’s rating label.

AC-side / shore:

On 110-240V shore/generator, plug the fridge into a 120V (or 230V) outlet. The inverter can supply this from the 48V bank if needed (rated power 45-65W, inrush 2-3x for a fraction of a second — trivial for the 5 kW inverter), but if shore/gen is present, use that directly and let the inverter rest.
Dedicated 120V circuit recommended for the fridge when on AC — the fridge is small (~45-65W, inrush 2-3x for a fraction of a second, trivial for the 5 kW inverter), but a dedicated circuit avoids breaker nuisance. Microwave and coffee maker are not in the plan (propane for cooking/heating), so they’re not a shared-circuit concern here. The fridge itself is the only planned 120V load on that circuit’s branch; the real risk on the fridge is breaker nuisance, not inverter headroom.

Heat interaction with the bus (unchanged from before — heat is the fridge’s real enemy, voltage aside):

The fridge is a heat pump: it moves heat from the cabinet to the condenser on the back/bottom. In a 90-100°F bus, the condenser fights a 90-100°F ambient to dump heat — efficiency drops, duty climbs, daily Wh climbs. In a 60-70°F bus it’s near nameplate; in a 100°F+ bus (closed-up bus in desert sun before shade) it climbs fast.
Shade the bus / get the condenser in airflow — a fridge jammed against a hot wall in a sun-baked bus runs a lot more than one with air behind it. Leave condenser clearance, don’t insulate over the condenser coils.
Pre-chill the load before putting warm food/drinks in — the fridge pays full compressor duty to pull a warm 2-liter down, a short burst of high Wh a plug-meter will catch.
Don’t set it colder than needed — beverage/produce at ~38-42°F is the efficient zone; freezer mode (sub-0°F) is a much higher-duty regime.

Installation/location on the E350 bus:

Freestanding compact — measure the bus cavity before final placement. Footprint is a dual-voltage compact (verify exact dims from the unit’s spec/label; dual-voltage 12V/24V R600a compactor compacts are typically ~18-21” wide × ~20-22” deep × ~31-34” tall, minus door swing + condenser clearance). Make sure the door swings fully open without hitting bus structure, and that the fridge sits level (compressors care about oil return — level is best; a 30° incline is usually OK per Danfoss/Secop-type DC compressor docs, but level is best).
Plan the 12V rail outlet at the fridge location if you go the rail route — a dedicated fused 12V outlet (or hardwired 12V feed to the fridge’s DC terminal/barrel) at the fridge beats an extension run across the aisle. If the fridge ships with a cigarette-lighter 12V plug, the outlet it plugs into must be where you intend (rail-fed or chassis 12V) and fused.
On AC, plan the 120V outlet at the fridge — same aisle-trip-hazard logic; a dedicated outlet beats an extension cord across the floor. If the inverter sits elsewhere, a properly-rated 120V extension (not a daisy of cheap cords) may be needed — watch voltage drop + heat on undersized cord.

Comparison framing for THIS fridge (dual-voltage DC/AC) vs AC-only vs native-12V-only:

This fridge (dual-voltage 12V/24V + 100-240V AC): good bus fit — DC-capable so it can run off a 48V→12V rail and avoid the inverter entirely on DC; also works on shore/generator AC directly. Cost: needs a 48V→12V converter if you want DC-from-the-48V-bank (the bus bank is 48V, the fridge is 12V); if there’s no rail, DC-from-bank means inverter. The 12V/24V dual rating is handy if the bus ever has a 24V rail too, but the 48V→12V path is the relevant one for this bus.
AC-only fridge (earlier writeup’s assumption): not this unit — would force inverter-on for cooling, idle tax, no DC option. Not what you have.
Native-12V-only compressor fridge (Nova Kool R3100, Equator RF-1216, Dometic, ARB, Whynter AC/DC): also DC-capable, runs off a 12V rail with no inverter; but many are 12V-only (no AC) and need a separate AC adapter or are AC/DC models. This dual-voltage fridge is arguably more flexible than a 12V-only unit because it covers AC directly too. The “is it worth a dedicated RV fridge vs this dual-voltage compact” call is: storage volume per dollar, build quality, noise, condenser access for cleaning, and whether you want the fridge to be a built-in vs freestanding — not raw voltage capability, since both can run on a 12V rail.

R600a safety: isobutane is flammable if the sealed refrigerant loop is breached. Never dent/puncture/kink the condenser lines; don’t use the fridge as a step or lean on it; if the cabinet is dented hard enough to suspect a line hit, stop using it and get it inspected. R600a is standard and safe in normal operation — the risk is only on line breach.

Bring the fridge’s actual daily Wh back to this file after trip 1 (plug-in wattmeter on the AC side OR a DC wattmeter/shunt on the 12V rail side, 30-day log, same practice as the Starlink tracking below). Update this section + the spreadsheet’s refrigerator row with measured numbers. Until then, ~400-700 Wh/day (temperate, well-run) is the planning number, with the hot/dusty/bus-error caveat toward 1,000 Wh/day.

Device	Avg Wattage (W)	Daily Hours	Daily Wh	Weekly Wh	Monthly kWh	Notes/Comments
Starlink Gen 3	75 (active) / 25 (idle)	Varies	Varies	Varies	Varies	Track active vs idle hours
Laptop	45-90 W	6-8	270-720	1,890-5,040	22-60	Power management settings
Monitor	20-45 W	6-8	120-360	840-2,520	10-30	Consider laptop screen only
LED Lights	5-10 W	4-8	20-80	140-560	2-7	Motion sensors help
	Refrigerator	Amazon B0928Z7QFK — dual-voltage R600a compressor fridge: AC 100-240V / DC 12V/24V, rated 45W~65W, rated current 4.6A / 5.5A (4.6A @ 12V ≈ 55W, inside the 45-65W band). NOT a 48V fridge — to run off the bus’s 48V bank on DC you need a 48V→12V DC-DC converter (the gear-research’s Victron Orion-Tr 48/12-30 is the recommended part: 55W ÷ 0.87 ≈ 63W from the 48V bank, ~0.5A @ 48V — trivial for the Orion’s 30A/360W rating, and the fridge becomes a clean 12V rail load with no inverter). On 12V DC via the rail the fridge avoids the inverter entirely (no inverter idle tax for its 24/7 life) — that’s the highest-leverage case, provided the bus has the 12V rail. On shore/generator 110-240V, plug into the wall directly — AC cord, no inverter from the bank. Inverter idle tax only bites when the fridge runs on 120V AC via the inverter (off-grid AND no 12V rail). [VERIFY] the fridge’s exact DC voltage range on its rating label before wiring it to the rail — a “12V/24V” dual fridge usually tolerates a wide 12V range (~10-15V) but confirm; the Orion rail’s 12.2V regulated output mitigates under/over-voltage risk either way. Planning envelope: ~400-700 Wh/day temperate/well-run (300-650 best case, 500-1,000 hot/dusty/desert), >1,000 Wh/day worst case (door left open, warm load, dusty condenser, freezer mode — do not plan to this). Measure on the bus with a plug-in wattmeter (AC side) OR a DC wattmeter/shunt (12V rail side) for 30 days before relying on any number; update this row + the §Refrigerator section with measured Wh. R600a isobutane is flammable if the sealed refrigerant loop is breached — never dent/puncture/kink the condenser lines; don’t use the fridge as a step or lean on it. Freestanding compact — measure the bus cavity before final placement (typical dual-voltage 12V/24V R600a compact: ~18-21” wide × ~20-22” deep × ~31-34” tall, minus door swing + condenser clearance — verify from the unit’s label).	Varies	Varies	Varies	Varies	30-day wattmeter log; dual-voltage so DC-on-rail is the efficient path when the rail exists; inverter-only when off-grid + no rail; shore/generator direct.
	Phone Charging	5-10 W	8-12	40-120	280-840	3-10	USB ports, low draw
	Portable AC (SereneLife SLPAC10, B07DQSNMWX) — 10,000 BTU, R-32, non-inverter rotary/scroll, 120V AC only, SEER 10.5, 1150W rated, ~55 lb, 52 dB, single 59” corrugated exhaust hose + window sealing kit (window-installation unit, NOT self-contained; must be sealed to the outside to cool anything; single-hose = negative-pressure, pulls replacement air in around seals). Fan-only mode is the cheap option (~30-70W). Cooling/dehumidify is the expensive option — compressor runs, duty cycle depends on ambient/insulation/seal quality; planning envelope: fan-only ~30-70 Wh per hour, cooling ~700-1,000W while compressor runs (inverter-from-bank), so ~0.7-1.0 kWh per cooling hour; ~1150W spikes at start/hot-load. This is an optional, bank-hours-limited comfort load — NOT in the baseline budget. Bank math: ~750 Wh per cooling-hour ≈ 6.5% of usable bank (48V, 11.5 kWh usable) per hour; 1 hour ≈ 6.5%, 4 hours ≈ 26% of usable bank (before fridge/Starlink/laptop/TV/lights/gear — so bank-only cooling is “situational cool-down,” not “run all day”). Shore/generator 120V is where this unit is at home (bank-free cooling as long as the source holds). [VERIFY] actual draw on the bus with a plug-in wattmeter (or inverter output meter) in the real conditions — fan-only, cooling-hot-bus, cooling-shaded-at-temp-bus, dehumidify — before relying on any hour/Wh number. Install caveat: the 59” exhaust hose + included window kit must be sealed to the outside on the bus (fabricate a bus window/vent mount); without a sealed exhaust the unit pumps hot exhaust back into the bus and makes things worse; single-hose portable pulls replacement air in around seals. R-32 refrigerant is A2L (mildly flammable) — standard/safe in normal operation, risk only on line breach; never dent/puncture/kink the loop. 52 dB audible, not silent. Drainage: auto-evaporate + manual drain; plan where condensate water goes on the bus. Wi-Fi + remote for control from across the bus; doesn’t change the power math. 4.3 ft cord — plan outlet location; proper-rated 120V extension only if needed (voltage drop + heat on undersized cord). Cooking/heating is propane (stove, propane heater) — no microwave, no coffee maker in the plan; the AC is the only additional 120V comfort load under consideration.**	Varies	Varies	Varies	Varies	Optional comfort load — bank-hours-limited; measure actual draw for real trip math; not assumed in the ~2,000-3,000 Wh baseline or the ~3,500-4,850 Wh gear-stack ceiling.
	Total Daily			Target: ~2,000-3,000 Wh (Starlink-only baseline; full gear stack pushes to ~3,500–4,850 Wh/day per ARCHITECTURE.md §Update the Power Budget Spreadsheet). No microwave, no coffee maker — both dropped from the budget; cooking/heating uses propane (stove, propane heater) and the microwave/coffee-maker inverter draw is not part of the plan.			Goal for sustainable off-grid

Starlink Power Monitoring Best Practices

Use a plug-in wattmeter (Kill-A-Watt style) between wall outlet and Starlink power supply
- Log full day including idle, streaming, and overnight periods
- Record: start date, end date, total kWh, peak watts, idle watts
If off-grid (DC): Use DC power meter/shunt
- Log both battery input AND AC output to capture conversion losses
- Record: ambient temperature, obstructions, usage pattern, firmware version
Track these variables daily:
- Hours of active use (streaming, video calls, large downloads)
- Hours of idle mode (maintaining satellite connection)
- Whether sleep schedule was used (reduces overnight draw)
- Weather conditions (clear vs cloudy/rainy)
- Any obstructions (trees, buildings, terrain)
- Snow-melt activation (cold weather)
Weekly review: Calculate total kWh, compare to battery capacity
- Adjust usage patterns if approaching battery limits
- Plan recharge cycles around solar generation
Monthly summary: Total Starlink kWh × your electricity rate
- Compare to grid-tied cost for context
- Inform future solar/battery sizing decisions

Recommended Starlink Model for Your Setup

Given your 3× 48V 100Ah battery bank (14.4 kWh) and remote work needs:

Model	Recommendation	Why
Starlink Mini	⭐⭐⭐⭐⭐	Lowest draw (25-40W); runs on USB-C PD; your battery bank easily supports 10+ days
Standard Gen 3 (V4)	⭐⭐⭐⭐	Most common; 75-100W active draw; your battery bank supports 8-12 days; Wi-Fi 6 good for work
Standard Actuated Gen 2	⭐⭐⭐	Higher complexity (motorized mast); proprietary 48V PoE; snow melt significant drain
Flat High Performance	⭐⭐	Highest draw (110-150W); dedicated PSU needed; overkill for remote work
Starlink V5	⭐⭐⭐⭐⭐	If available: 35-50W average (half V4); most efficient; perfect for your battery bank

Priority Action Items

Purchase Starlink kit - Match to your battery bank (Mini or Gen 3 recommended)
Install wattmeter - Track actual consumption for first 30 days
Set up power tracking spreadsheet - Use the template above
Establish “Starlink schedule” - Power on for work hours, off overnight
Plan solar additions — if traveling with the full gear stack (e-trike + drone + RC + kite + TV), size for ~1,000–1,200W array to cover ~4,000–5,000 Wh/day, not the Starlink-only 300–400W above. With the owned DF1100T generator carried, drop that to ~600–800W (fuel-saver/quiet-hours) and let the gen do high-load days — see the Generator-Assisted Power section above. See destinations/event-gear/ARCHITECTURE.md §Update the Power Budget Spreadsheet. If no gear stack, 300–400W covers Starlink + base loads only.
Test before departing - Verify all-day runtime with your specific usage patterns

Monthly Power Cost Projection

Starlink Model	24/7 Usage Monthly kWh	Cost @ $0.12/kWh	Cost @ $0.16/kWh (US avg)	Cost @ $0.32/kWh (CA/HI)
Mini (25-40W)	18-29 kWh	$2.16 - $3.48	$2.88 - $4.64	$5.76 - $9.28
Gen 3 (75-100W)	54-72 kWh	$6.48 - $8.64	$8.64 - $11.52	$17.28 - $23.04
Gen 2 Actuated (50-75W)	36-54 kWh	$4.32 - $6.48	$5.76 - $8.64	$11.52 - $17.28
Flat HP (110-150W)	79-108 kWh	$9.48 - $12.96	$12.64 - $17.28	$25.28 - $34.56

Note: These costs are negligible compared to battery/solar infrastructure needs, but important for budgeting.