Anker SOLIX C1000 Gen 2. The smallest in-stock battery with measured capacity that lasts a full night on a CPAP. 890Wh measured in an independent test.
16 power stations sold in the US, ranked by hours on a ResMed AirSense 11. 11 have capacity measured by an independent tester. The other 5 are estimates from the maker's rating.
| Device | What it uses | Where the figure comes from |
|---|---|---|
| CPAP (ResMed AirSense 11) See the rankingResMed user guide | 56.1W typical, 73.2W peak | ResMed user guide |
| Refrigerator, full size (2 models) Next to be rankedEnergy label, ENERGY STAR data (Frigidaire, Samsung) | 42 to 74W, daily average | Energy label, ENERGY STAR data (Frigidaire, Samsung) |
| Chest freezer (2 models)Energy label, ENERGY STAR data (GE, Whirlpool) | 23 to 32W, daily average | Energy label, ENERGY STAR data (GE, Whirlpool) |
| Sump pump, about 1/3 HP (2 models; start figure is the Liberty 257's, Zoeller publishes none)Volts × maker amps, an upper bound (Liberty, Zoeller) | 598 to 1,116W running; 920W at start | Volts × maker amps, an upper bound (Liberty, Zoeller) |
| Sump pump, 1/2 HP (Liberty 287)Volts × maker amps, an upper bound | 920W running; 2,645W at start | Volts × maker amps, an upper bound |
| Gas furnace blower (Goodman, 60k BTU)Maker fan table | 336W, blower only (excludes inducer and igniter) | Maker fan table |
| Well pump, 1/2 HP (Franklin, 115V or 240V models)Franklin motor manual | 670W running; 7,406W at start (volts × locked-rotor amps, an upper bound) | Franklin motor manual |
| Cable modem or Wi-Fi router, each box (4 models)Ready-state watts published by Xfinity | 11 to 18W | Ready-state watts published by Xfinity |
| LED bulb, 60W equivalent (Feit)Maker spec | 8.8W | Maker spec |
| Oxygen concentrator, home (2 models)Maker average (Philips, CAIRE) (Philips, CAIRE) | 290 to 350W | Maker average (Philips, CAIRE) (Philips, CAIRE) |
These are the watts each device uses, from the makers' sheets and public energy data. Fridges and freezers show a daily average, since the compressor cycles. Sump pump figures and every start figure show volts × maker amps, an upper bound. Hours depend on the power station, so we rank 1 device at a time. CPAP is ranked. The refrigerator is next.
Motors pull far more for a moment at start. A Liberty 287 sump pump can hit 2,645W and a 1/2 HP well pump 7,406W, more than most portable power stations can supply. Well pumps and furnaces are hardwired: an electrician fits the transfer switch, and never backfeed a house. CPAP and oxygen concentrators: no power station here switches over in 0 ms, so none is a medical UPS. Check with your equipment supplier.
Hours at ResMed's 56.1W typical draw, for the 11 power stations with measured capacity. Each bar runs from the shortest-running to the longest-running unit of that size.
Average customer, all outages counted, including major storms. Shown: the 10 states with the most hours.
Source: U.S. Energy Information Administration, Form EIA-861, 2024 final data. All 50 states and DC
You get less out of a battery than the number on the box. The 11 measured units here gave back 78 to 93% of their rating, with a middle value of 86%. So we rank on what testers drew from each unit, and mark the rest as estimates.