FOSSiBOT F1800
#4 in Mid-sizeFull review
A budget 1kWh LiFePO4 station for camping and short outages, with fast wall charging and strong USB-C ports.
Amazon $399 FOSSiBOT $419$399
The FOSSiBOT F1800 is the better portable power station overall, rated 4.4 to 4.2. The FOSSiBOT F1800 leads on value and portability. The EcoFlow DELTA 3 wins on features. The FOSSiBOT F1800 costs $230 less ($399 vs $629).
EcoFlow DELTA 3
#11 in Mid-sizeFull review
A well-rounded 1kWh LiFePO4 station for home backup and car camping that charges from the wall in under an hour.
Amazon $629 EcoFlow $629$629
Prices were last checked October 20, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the FOSSiBOT F1800 for value ($0.39 per rated Wh vs $0.61 per rated Wh) and portability (91 Wh per kg (24.8 lb (11.2 kg)) vs 82 Wh per kg (27.6 lb (12.5 kg))).
- Choose the EcoFlow DELTA 3 for features (UPS (10 ms), expandable, 100 W USB-C, app vs UPS (10 ms), 140 W USB-C, app).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every mid-size portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | FOSSiBOT F1800 | EcoFlow DELTA 3 |
|---|---|---|
| Overall rating | 4.4/5 | 4.2/5 |
| Value 25% | 95 $0.39 per rated Wh | 65 $0.61 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 68 85% of rated capacity delivered (1 test) |
| Battery life 15% | 100 LiFePO4, 4,000 cycles, 5-year warranty | 100 LiFePO4, 4,000 cycles, 5-year warranty |
| AC output 15% | 82 1,800 W continuous AC | 82 1,800 W continuous AC |
| Charging speed 10% | 91 0-100% on AC in 1 h 8 min | 97 0-100% on AC in 56 min |
| Portability 10% | 84 91 Wh per kg (24.8 lb (11.2 kg)) | 67 82 Wh per kg (27.6 lb (12.5 kg)) |
| Solar input 5% | 40 500 W max solar input | 40 500 W max solar input |
| Features 5% | 75 UPS (10 ms), 140 W USB-C, app | 100 UPS (10 ms), expandable, 100 W USB-C, app |
Independent capacity tests
FOSSiBOT F1800
No independent test published yet.
EcoFlow DELTA 3
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 870 Wh | 85% | Light-bar load bank at roughly 80% of rated AC output, 100% to shutdown, measured at the AC outlet. |
Specifications
| FOSSiBOT F1800 | EcoFlow DELTA 3 | |
|---|---|---|
| Battery | ||
| Rated capacity | 1,024 Wh | 1,024 Wh |
| Tested usable capacity | - | 870 Wh (85%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 to 80% | 4,000 to 80% |
| Expandable | No | Yes, up to 5,000 Wh |
| Output | ||
| AC output | 1,800 W (3,600 W surge) | 1,800 W (3,600 W surge) |
| Boost mode (resistive loads) | - | 2,200 W |
| AC outlets | 3 total | 6 total |
| 120V 20A outlets (NEMA 5-20R) | 3 | 3 |
| 120V 2-prong outlets (NEMA 1-15R) | - | 3 |
| AC waveform | Pure sine wave | - |
| USB-C ports | 2 (up to 140 W each) | 2 (up to 100 W each) |
| USB-A ports | 1 | 2 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | - | 2 |
| UPS / pass-through | Yes (10 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,200 W | 1,500 W |
| Full AC charge time | 1 h 8 min | 56 min |
| Max solar input | 500 W | 500 W |
| Solar input voltage | 12-60V, 15A | 11-60V |
| Car charging | 120 W | 800 W |
| Build | ||
| Weight | 24.8 lb (11.2 kg) | 27.6 lb (12.5 kg) |
| Dimensions | 14.6 x 8.1 x 10.2 in | 15.7 x 8.0 x 11.2 in |
| App | FOSSiBOT app (Wi-Fi/Bluetooth) | EcoFlow app |
| Warranty | 5 years | 5 years |