Drawing · 27.6 × 15.3 × 15.6 in · 136.7 lb
$2,399.99 $2,699.99 at Anker SOLIX
Highest in our checks since Oct 7 (low $2,269.99)
- Capacity
- 3,840 Wh
- Output
- 6,000 W (9,000 surge)
- Weight
- 136.7 lb
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Anker SOLIX F3800 Plus vs EcoFlow DELTA Pro Ultra
Two whole-home systems at the top of their makers' ranges, both with 120 V and 240 V outlets and both built to grow past 25 kWh: Anker's one-box F3800 Plus against EcoFlow's DELTA Pro Ultra, sold as an inverter and a battery that stack. The F3800 Plus is the cheaper energy, 9% less per watt-hour at the makers' prices, is 45.1 lb lighter and has 8 AC outlets against 6. The DELTA Pro Ultra holds 2,304 Wh more, gives 1,200 W more continuous output and takes 5,600 W of solar against 3,200 W: buy it for that, and the F3800 Plus for the money.
Drawing · 181.8 lb
$4,199 $5,799 at EcoFlow
- Capacity
- 6,144 Wh
- Output
- 7,200 W (10,800 surge)
- Weight
- 181.8 lb
Capacity
3,840 Wh
6,144 Wh
AC output
6,000 W
7,200 W
Surge
9,000 W
10,800 W
Solar input
3,200 W
5,600 W
Weight
136.7 lb
181.8 lb
Anker SOLIX
Anker SOLIX F3800 Plus
$2,399.99 $2,699.99 at Anker SOLIX
Highest in our checks since Oct 7 (low $2,269.99)
- Capacity
- 3,840 Wh
- AC output
- 6,000 W
- Surge
- 9,000 W
- Solar input
- 3,200 W
- Weight
- 136.7 lb
Buy it if you want the most stored energy per dollar ($0.62 against $0.68 per Wh).
EcoFlow
EcoFlow DELTA Pro Ultra
$4,199 $5,799 at EcoFlow
- Capacity
- 6,144 Wh
- AC output
- 7,200 W
- Surge
- 10,800 W
- Solar input
- 5,600 W
- Weight
- 181.8 lb
Buy it if you need more continuous output (7,200 W continuous and 10,800 W surge, against 6,000 W and 9,000 W).
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Figure by figure
Compare the differences that matter for your devices; Anker SOLIX F3800 Plus leads on 5, EcoFlow DELTA Pro Ultra on 4, and the rest are equal or not comparable.
| Figure | F3800 Plus | DELTA Pro Ultra |
|---|---|---|
| Capacity | 3,840 Wh | 6,144 Wh |
| Output (surge) | 6,000 W (9,000 surge) | 7,200 W (10,800 surge) |
| Weight | 136.7 lb | 181.8 lb |
| Price | $2,399.99 | $4,199 |
| Price per Wh | $0.62 | $0.68 |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 to 80% | 3,500 to 80% |
| Max solar input | 3,200 W | 5,600 W |
| Max AC input | 1,800 W | 1,800 W |
| Wall recharge | – | – |
| Expandable | yes, to 26,880 Wh | yes, to 30,000 Wh |
| UPS switchover | 20 ms | 20 ms |
| AC outlets | 8 | 6 |
| USB-C ports | 3 | 2 |
| Warranty | 5 years | 5 years |
| Dimensions | 27.6 x 15.3 x 15.6 in | – |
Cycle counts are highlighted only when both makers rate them to the same remaining capacity. A full recharge is not ranked against a charge to 80%. Missing figures never count as an advantage. These are manufacturer ratings; matching endpoints do not prove identical test conditions.
Rated cycles: F3800 Plus, 3,000 to 80%; DELTA Pro Ultra, 3,500 to 80%.
How the comparison is worked out
| Figure | F3800 Plus | DELTA Pro Ultra | Meaning |
|---|---|---|---|
| Capacity | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Output (surge) | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Weight | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Price | F3800 Plus price source · checked Oct 9, 2026 | DELTA Pro Ultra price source · checked Oct 11, 2026 | As the maker states it; a dash where not published |
| Price per Wh | F3800 Plus price source · checked Oct 9, 2026 | DELTA Pro Ultra price source · checked Oct 11, 2026 | Price ÷ rated Wh; calculated, not measured |
| Chemistry | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Rated cycles | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | Stated cycles and remaining-capacity percentage; conditions may differ |
| Max solar input | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Max AC input | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Wall recharge | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | Keep the full or 80% charge endpoint |
| Expandable | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| UPS switchover | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| AC outlets | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| USB-C ports | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Warranty | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
| Dimensions | F3800 Plus spec sheet | DELTA Pro Ultra spec sheet | As the maker states it; a dash where not published |
Estimated AC energy = rated Wh × 0.85. Runtime = estimated AC energy ÷ load W, with no reserve. Capacity and weight differences use the displayed figures; price per Wh uses each model's own price and the day it was checked. The device draws are in the watt-hour calculator.
- Capacity: DELTA Pro Ultra minus F3800 Plus = 2,304 Wh (60% of the F3800 Plus figure).
- Carry weight: DELTA Pro Ultra minus F3800 Plus = 45.1 lb (33% of the F3800 Plus figure).
- Price per Wh: DELTA Pro Ultra minus F3800 Plus = 0.06 USD/Wh (9.3% of the F3800 Plus figure).
Will it run your gear?
Check whether each unit has enough battery and output for the devices you want to run.
| Use | Needs | F3800 Plus | DELTA Pro Ultra |
|---|---|---|---|
| a day of home backup (a full-size refrigerator, a router, phones and lights for a day) | 2,323 Wh, 161 W running, 1,351 W startup | yes | yes |
| a night of CPAP (a CPAP with its humidifier for one 8-hour night) | 599 Wh, 53 W running, 104 W startup | yes | yes |
| two nights of camping (camp lights, phones, a laptop and a fan for two nights) | 2,066 Wh, 157 W running, 157 W startup | yes | yes |
| a day in an RV (a day of RV lights, TV, phones and a laptop) | 648 Wh, 156 W running, 156 W startup | yes | yes |
| a working day in a van (a working day of laptop, Starlink, lights and a fan) | 1,674 Wh, 189 W running, 189 W startup | yes | yes |
| a laptop and two phones (a laptop for six hours and two phone charges) | 396 Wh, 60 W running, 60 W startup | yes | yes |
Runtime by device
Hours = capacity × 0.85 ÷ device watts, with the draws from the device table; "Start" says whether the output and surge ratings cover the startup figure we use for each device (the refrigerator, 1,300 W startup allowance, from a larger 27 cu ft Whirlpool's tech sheet), so a "yes" there means likely, not certain, to start yours.
| Device | Draw W | F3800 Plus h | Start | DELTA Pro Ultra h | Start |
|---|---|---|---|---|---|
| CPAP machine (with heated humidifier) | 53 | 61.6 | yes | 98.5 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw) | 41 | 79 | yes | 126.5 | yes |
| Laptop (MacBook Air, charging) | 40 | 81.6 | yes | 130.6 | yes |
| Wi-Fi router | 24 | 136 | yes | 217.6 | yes |
| Starlink Mini (router built in) | 33 | 100.4 | yes | 160.7 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 36.7 | yes | 58.7 | yes |
| Space heater, 1500 W | 1,500 | 2.2 | yes | 3.5 | yes |
Buy the F3800 Plus if…
- you want the most stored energy per dollar ($0.62 against $0.68 per Wh)
- the $1,799.01 difference matters more than the specs
- you carry it more than you run it (136.7 lb against 181.8 lb)
Buy the DELTA Pro Ultra if…
- you need more continuous output (7,200 W continuous and 10,800 W surge, against 6,000 W and 9,000 W)
- you need a higher solar input ceiling (5,600 W against 3,200 W); actual recharge depends on the panels
- you want the higher stated cycle count at the same 80% remaining capacity (3,500 against 3,000); test conditions can still differ
- you want the extra capacity (6,144 Wh against 3,840 Wh)
More models from both brands: Anker SOLIX and EcoFlow. Every model we list: all 116 in one table. Your own devices: the watt-hour calculator.
Questions buyers ask
Which is better for power outages, the F3800 Plus or the DELTA Pro Ultra?
Anker SOLIX F3800 Plus states a 20 ms switchover, so it can sit between the wall and a fridge or router and take over when the power cuts, once the device is in an outlet the manual gives the backup to and any AC timeout is off (for a CPAP or a computer, check that device rides through the switch); EcoFlow DELTA Pro Ultra states 20 ms. EcoFlow DELTA Pro Ultra holds more (6,144 against 3,840). Check your appliance's startup watts against the surge figures in the table.
Which is cheaper per watt-hour?
F3800 Plus at $0.62 per Wh against $0.68. This compares purchase price with rated capacity, not lifetime delivered energy.
Can either run a window air conditioner?
Only if the air conditioner's running watts stay under the AC output (6,000 W on the F3800 Plus, 7,200 W on the DELTA Pro Ultra) and its start fits the surge figures in the table: read both on the air conditioner's label or in its manual, and test it before you rely on it. For the hours, multiply the rated Wh by 0.85 for inverter losses and divide by the running watts. A unit whose label says 500 W, for example, would run about 6.5 hours on the F3800 Plus and about 10.4 hours on the DELTA Pro Ultra on a full charge, if its compressor ran without a break.