FOSSiBOT F3600 Pro
#7 in Home backupFull review
A large home-backup station for buyers who want lots of capacity and solar input at a low price per watt-hour, and don’t need to move it often.
Amazon $1,139 FOSSiBOT $1,219$1,139
The FOSSiBOT F3600 Pro is the better portable power station overall, rated 4.0 to 3.7. The FOSSiBOT F3600 Pro leads on value, portability and features. The EcoFlow DELTA Pro wins on charging speed. The FOSSiBOT F3600 Pro costs $660 less ($1,139 vs $1,799).
EcoFlow DELTA Pro
#21 in Home backupFull review
A heavy 3.6kWh station built for home backup that can grow into a 25 kWh system. It still makes sense if you want that expansion path, but newer models give similar capacity for less.
Amazon $1,799$1,799
Prices were last checked October 24, 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 F3600 Pro for value ($0.30 per rated Wh vs $0.50 per rated Wh), portability (91 Wh per kg (92.6 lb (42 kg)) vs 80 Wh per kg (99 lb (45 kg))) and features (UPS (10 ms), expandable, 100 W USB-C, app vs expandable, 100 W USB-C, app).
- Choose the EcoFlow DELTA Pro for charging speed (0-100% on AC in 2 h 42 min vs 0-100% on AC in 3 h).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every home backup portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | FOSSiBOT F3600 Pro | EcoFlow DELTA Pro |
|---|---|---|
| Overall rating | 4.0/5 | 3.7/5 |
| Value 25% | 100 $0.30 per rated Wh | 69 $0.50 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 66 84% of rated capacity delivered (2 tests) |
| Battery life 15% | 100 LiFePO4, 6,500 cycles, 5-year warranty | 96 LiFePO4, 3,500 cycles, 5-year warranty |
| AC output 15% | 37 3,600 W continuous AC | 37 3,600 W continuous AC |
| Charging speed 10% | 32 0-100% on AC in 3 h | 41 0-100% on AC in 2 h 42 min |
| Portability 10% | 84 91 Wh per kg (92.6 lb (42 kg)) | 64 80 Wh per kg (99 lb (45 kg)) |
| Solar input 5% | 44 2,000 W max solar input | 35 1,600 W max solar input |
| Features 5% | 100 UPS (10 ms), expandable, 100 W USB-C, app | 65 expandable, 100 W USB-C, app |
Independent capacity tests
FOSSiBOT F3600 Pro
No independent test published yet.
EcoFlow DELTA Pro
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 3,060 Wh | 85% | AC discharge test; the review’s spec table lists 2,950 Wh. Measured AC recharge took a little over 2 hours. |
| The Solar Lab | - | 84% | AC discharge; load not specified. AC recharge took about 2 h 15 min; idle draw 21W. |
Specifications
| FOSSiBOT F3600 Pro | EcoFlow DELTA Pro | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,840 Wh | 3,600 Wh |
| Tested usable capacity | - | 3,042 Wh (84%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 6,500 to 80% per product description and Amazon; US spec table says to 50% | 3,500 to 80% (6,500 to 50%) |
| Expandable | Yes, up to 11,520 Wh | Yes, up to 25,000 Wh |
| Output | ||
| AC output | 3,600 W (7,200 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | - | 4,500 W |
| AC outlets | 5 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | 4 (up to 100 W each) | 2 (up to 100 W each) |
| USB-A ports | 2 | 4 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 2 | 2 |
| UPS / pass-through | Yes (10 ms switchover) | - |
| Charging | ||
| AC charging | 1,500 W | 1,800 W |
| Full AC charge time | 3 h (Manufacturer: about 3 hours on AC; 1 h 50 min with AC + solar (3500W)) | 2 h 42 min (2.7 h at 1800W on 120V; 1.8 h at 3000W on 240V) |
| Max solar input | 2,000 W | 1,600 W |
| Solar input voltage | 12-160V, 20A | 11-150V, 15A |
| Car charging | 120 W | 96 W |
| Build | ||
| Weight | 92.6 lb (42 kg) | 99 lb (45 kg) |
| Dimensions | 24.0 x 12.6 x 18.7 in | 25 x 11.2 x 16.4 in |
| App | FOSSiBOT app | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years | 5 years |
| Released | 2024-07 | 2021 |