Model comparison
The two whole-home flagships that get wired to a transfer switch: Anker's F3800 against EcoFlow's DELTA Pro 3, both around 4 kWh and both expandable. Anker SOLIX F3800 is the cheaper energy by 19% per watt-hour. EcoFlow DELTA Pro 3 answers with capacity, weight, rated cycles, max solar input; buy it for those, and the F3800 for the money.
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Anker SOLIX3.6/5 overall
Score from the maker's figures and 3 independent reviews
Why it’s here
Buy it if you want the most stored energy per dollar ($0.57 against $0.68 per Wh).
$2,200 · $0.57/Wh
EcoFlow3.7/5 overall
Score from the maker's figures and 4 independent reviews
Why it’s here
Buy it if you carry it more than you run it (113.5 lb against 132.3 lb).
$2,799 · $0.68/Wh
Compare the differences that matter for your devices; Anker SOLIX F3800 leads on 5, EcoFlow DELTA Pro 3 on 5, and the rest are equal or not comparable.
| Field | F3800 | DELTA Pro 3 |
|---|---|---|
| Capacity | 3,840 Wh | 4,096 Wh |
| Output (surge) | 6,000 W (9,000 surge) | 4,000 W (8,000 surge) |
| Weight | 132.3 lb | 113.5 lb |
| Price | $2,200 | $2,799 |
| Price per Wh | $0.57 | $0.68 |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 to 80% | 4,000 to 80% |
| Max solar input | 2,400 W | 2,600 W |
| Max AC input | 1,800 W | 1,800 W |
| Wall recharge | – | – |
| Expandable | yes, to 26,880 Wh | yes, to 12,000 Wh |
| UPS switchover | 20 ms | 10 ms |
| AC outlets | 8 | 7 |
| USB-C ports | 3 | 2 |
| Warranty | 5 years | 5 years |
| Dimensions | 27.6 x 15.3 x 15.6 in | 16.16 x 13.43 x 27.28 in |
Check whether each unit has enough battery and output for the devices you want to run.
| Job | Needs | F3800 | DELTA Pro 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 | yes | yes |
| 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 | yes | yes |
| 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 | yes | yes |
| 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 | F3800 h | Start | DELTA Pro 3 h | Start |
|---|---|---|---|---|---|
| CPAP machine (with heated humidifier) (with humidifier) | 53 | 61.6 | yes | 65.7 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw) | 41 | 79 | yes | 84.3 | yes |
| Laptop (MacBook Air, charging) | 40 | 81.6 | yes | 87 | yes |
| Wi-Fi router | 24 | 136 | yes | 145.1 | yes |
| Starlink Standard kit (dish + router) | 88 | 37.3 | yes | 39.8 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 36.7 | yes | 39.1 | yes |
| Space heater, 1500 W | 1,500 | 2.2 | yes | 2.3 | 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, DELTA Pro 3 refills faster from a panel, and DELTA Pro 3 states a UPS switchover time for sitting between the wall and the fridge.
F3800 at $0.57 per Wh against $0.68. 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.
