EcoFlow DELTA 2 Max vs FOSSiBOT F2400: Which to Buy

The FOSSiBOT F2400 is the better portable power station overall, rated 4.2 to 4.1. The FOSSiBOT F2400 leads on value and battery life. The EcoFlow DELTA 2 Max wins on tested capacity, charging speed and solar input. The FOSSiBOT F2400 costs $470 less ($579 vs $1,049).

Higher rated

FOSSiBOT F2400

#6 in Large4.2Full review

A low-cost 2kWh station for home backup and RV use when price per watt-hour matters more than charging speed.

Amazon $579 FOSSiBOT $609

$579

EcoFlow DELTA 2 Max

#9 in Large4.1Full review

A proven 2kWh LiFePO4 station for home backup and RV trips with plenty of outlets. It costs less than the DELTA 3 Max Plus but has slower switchover and less output.

Amazon $1,049

$1,049

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 F2400 for value ($0.28 per rated Wh vs $0.51 per rated Wh) and battery life (LiFePO4, 4,000 cycles, 5-year warranty vs LiFePO4, 3,000 cycles, 5-year warranty).
Choose the EcoFlow DELTA 2 Max for tested capacity (88% of rated capacity delivered (1 test) vs 84% of rated capacity delivered (2 tests)), charging speed (0-100% on AC in 1 h 20 min vs 0-100% on AC in 2 h) and solar input (1,000 W max solar input vs 500 W max solar input).

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every large portable power station; a clear win is highlighted. How we rank explains each one.

Factor weight	FOSSiBOT F2400	EcoFlow DELTA 2 Max
Overall rating	4.2/5	4.1/5
Value 25%	100 $0.28 per rated Wh	67 $0.51 per rated Wh
Tested capacity 15%	64 84% of rated capacity delivered (2 tests)	81 88% of rated capacity delivered (1 test)
Battery life 15%	100 LiFePO4, 4,000 cycles, 5-year warranty	91 LiFePO4, 3,000 cycles, 5-year warranty
AC output 15%	54 2,400 W continuous AC	54 2,400 W continuous AC
Charging speed 10%	63 0-100% on AC in 2 h	84 0-100% on AC in 1 h 20 min
Portability 10%	87 93 Wh per kg (48.5 lb (22 kg))	80 89 Wh per kg (50 lb (23 kg))
Solar input 5%	11 500 W max solar input	40 1,000 W max solar input
Features 5%	75 UPS (8 ms), 100 W USB-C, app	100 UPS (30 ms), expandable, 100 W USB-C, app

Independent capacity tests

FOSSiBOT F2400

Tested by	Usable AC energy	Of rated	Conditions
techtest.org	1,781 Wh	87%	European 230V model, AC outlets at a 1,200W load (from the review’s capacity chart). Other AC runs: 1,717 Wh at 2,000W and 1,512 Wh at 100W. Full AC recharge took about 2 h 45 min at the 1,100W setting.
nextpit	1,659 Wh	81%	Full discharge of the European 230V model (load not stated); 2,127 Wh from the wall to recharge, about 78% round trip.