Runtime evidence · sourced load
A 12V camping fridge draws 13.5 W while running. 66 stations clear the capacity, inverter, and startup checks at that load.
By the BatteryRank Engineering Team
01 · Runtime ladder
Nominal capacity × depth of discharge × inverter efficiency ÷ sourced average draw.
| Capacity class | Estimated runtime | Evidence |
|---|---|---|
| 300 Whstep 1 | 17 hr | 12V camping fridge (45L) load · 2026-07-06 |
| 500 Whstep 2 | 28.3 hr | 12V camping fridge (45L) load · 2026-07-06 |
| 1,000 Whstep 3 | 56.7 hr | 12V camping fridge (45L) load · 2026-07-06 |
| 2,000 Whstep 4 | 113.3 hr | 12V camping fridge (45L) load · 2026-07-06 |
These are comparison projections, not a promise. Temperature, inverter behavior, cycling, and the individual station's measured delivered capacity can change real runtime.
02 · Reading the numbers
A 12 V compressor fridge is the one appliance here that can skip the inverter entirely. Running it from the station's DC socket avoids the DC-to-AC conversion step and the losses that come with it, which is why the same fridge on the same station can last noticeably longer on the 12 V outlet than on a wall socket.
Running it on AC out of habit, through the fridge's bundled mains adapter, and paying the inverter tax for no reason. The other one is trusting the rated draw: a compressor fridge cycles, and its duty depends almost entirely on ambient temperature and how often the lid is opened. The same fridge is a modest load in spring and a serious one in a hot vehicle.
Our figure is a steady-state duty for a mid-size 12 V fridge at moderate ambient temperature. Pull-down from warm, direct sun on the cabinet, and frequent opening all push consumption well above it — plan a margin rather than the projection.
03 · Passing stations
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Lightweight fit
Why it fits
5.7 kg, 9.3 kg below the 15 kg preferred limit
Main compromise
9,800 W below the highest sourced solar input across 66 eligible models
Best all-round fit
Why it fits
72 BatteryRank score — the highest of any station that fits this plan
Main compromise
7.7 points below the highest-scoring eligible model (65 of 66 eligible models have this sourced value)
Longer off-grid stay
Why it fits
96.3 projected runtime hours
Main compromise
677.4 hours less projected runtime than the longest-running eligible model across 66 eligible models
This ordered data view is separate from the three recommended buying strategies above.
Runtime uses each linked model's sourced capacity and output data; open its dossier for provenance.
Solar effect
Computed with this model's sourced solar-input limit and BatteryRank's published harvest assumptions. Check the solar method → · Model sources →
04 · Evidence record