Hours = Wh × efficiency ÷ device watts. Using the AC outlets costs roughly 10–15% to inverter losses; DC and USB outputs are more efficient. Fridges and CPAP machines cycle, so use their average draw.
| Device | Typical avg W | 1,000 Wh lasts |
|---|---|---|
| 12V compressor fridge | 20 | 42 h |
| CPAP (no humidifier) | 40 | 21 h |
| Starlink Mini | 30 | 28 h |
| 32" TV | 50 | 17 h |
| Laptop | 60 | 14 h |
Safety: These are general estimates, not a design. Follow your equipment manufacturer's instructions and local electrical code, and consult a qualified electrician for anything connected to shore power, a house, or high-current batteries.
A 12 V compressor fridge averaging 20 W runs about 40 hours on AC power from a 1,000 Wh station; a residential fridge averaging 100–150 W runs about 6–8 hours.
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