Model comparison
Two 1,024 Wh units on the same shelf at different prices: Anker's C1000 Gen 2 against EcoFlow's DELTA 3. Anker SOLIX C1000 Gen 2 is the cheaper energy by 19% per watt-hour. EcoFlow DELTA 3 answers with expandable, ac outlets; buy it for those, and the C1000 Gen 2 for the money.
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Anker SOLIX3.7/5 overall
Score from the maker's figures and 4 independent reviews
Why it’s here
Buy it if you want the most stored energy per dollar ($0.52 against $0.61 per Wh).
$530 · $0.52/Wh
EcoFlow4.0/5 overall
Score from the maker's figures and 2 independent reviews
Why it’s here
Buy it if you may want to add a battery later.
$629 · $0.61/Wh
Compare the differences that matter for your devices; Anker SOLIX C1000 Gen 2 leads on 8, EcoFlow DELTA 3 on 2, and the rest are equal or not comparable.
| Field | C1000 Gen 2 | DELTA 3 |
|---|---|---|
| Capacity | 1,024 Wh | 1,024 Wh |
| Output (surge) | 2,000 W (3,000 surge) | 1,800 W (3,600 surge) |
| Weight | 24.9 lb | 27.6 lb |
| Price | $530 | $629 |
| Price per Wh | $0.52 | $0.61 |
| Chemistry | – | LiFePO4 |
| Rated cycles | 4,000 to 80% | 4,000 to 80% |
| Max solar input | 600 W | 500 W |
| Max AC input | 1,600 W | 1,500 W |
| Wall recharge | 49 min | 56 min |
| Expandable | no | yes, to 5,000 Wh |
| UPS switchover | 10 ms | 10 ms |
| AC outlets | 5 | 6 |
| USB-C ports | 3 | 2 |
| Warranty | 5 years | 5 years |
| Dimensions | 15.12 x 8.19 x 9.61 in | 15.7 x 8.0 x 11.2 in |
Check whether each unit has enough battery and output for the devices you want to run.
| Job | Needs | C1000 Gen 2 | DELTA 3 |
|---|---|---|---|
| a day of home backup (a full-size refrigerator, a router, phones and lights for a day) | 2,323 Wh, 1,351 W start | no: too little capacity | no: too little capacity |
| a night of CPAP (a CPAP with its humidifier for one 8-hour night) | 627 Wh, 124 W start | yes | yes |
| two nights of camping (a compressor cooler, lights, phones, a laptop and a fan for two nights) | 2,066 Wh, 157 W start | no: too little capacity | no: too little capacity |
| a day in an RV (a 12 V fridge, lights, TV, coffee maker, phones and a laptop for a day) | 648 Wh, 156 W start | yes | yes |
| a working day in a van (a working day of laptop, Starlink, fridge, lights and a fan) | 2,295 Wh, 244 W start | no: too little capacity | no: too little capacity |
| a laptop and two phones (a laptop for six hours and two phone charges) | 396 Wh, 60 W start | yes | yes |
Hours = capacity × 0.85 ÷ device watts, with the draws from the device table; "start" is whether the inverter's surge clears the device.
| Device | Draw W | C1000 Gen 2 h | Start | DELTA 3 h | Start |
|---|---|---|---|---|---|
| CPAP machine (with heated humidifier) (with humidifier) | 53 | 16.4 | yes | 16.4 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw) | 41 | 21.1 | yes | 21.1 | yes |
| Laptop (MacBook Air, charging) | 40 | 21.8 | yes | 21.8 | yes |
| Wi-Fi router | 24 | 36.3 | yes | 36.3 | yes |
| Starlink Standard kit (dish + router) | 88 | 9.9 | yes | 9.9 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 9.8 | yes | 9.8 | yes |
| Space heater, 1500 W | 1,500 | 0.6 | yes | 0.6 | yes |
Both brands' full ranges: Anker SOLIX and EcoFlow. Every unit at this size: the full table. Your own devices: the sizing calculator.
The one whose surge clears your refrigerator's compressor and whose capacity covers the days you need; both are in the tables above. Between the two, C1000 Gen 2 refills faster from a panel, and C1000 Gen 2 states a UPS switchover time for sitting between the wall and the fridge.
C1000 Gen 2 at $0.52 per Wh against $0.61. Cycle life changes the lifetime figure: a unit rated for more cycles delivers more energy over its life for the same price.
A small window unit draws 500 to 1,000 W running and several times that for an instant at start; check the surge figure in the table against the air conditioner's label. Either way an afternoon of it empties a 1 kWh unit; the RV page works the rooftop version.
