The Growatt HELIOS 3600 is the better portable power station overall, rated 3.9 to 3.8. The Growatt HELIOS 3600 leads on value. The EcoFlow DELTA Pro 3 wins on AC output and solar input. The Growatt HELIOS 3600 costs $1,600.02 less ($1,198.98 vs $2,799).
A 3.7 kWh home backup station for buyers who want 240V from one unit and the option to grow toward whole-home backup. At the Amazon price it is one of the cheaper ways to get that much LiFePO4 capacity.
Amazon $1,198.98 Growatt $1,599For households that want a single wheeled unit able to back up 240V circuits and expand toward whole-home capacity.
Amazon $2,799 EcoFlow $2,799Prices 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.
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 | Growatt HELIOS 3600 | EcoFlow DELTA Pro 3 |
|---|---|---|
| Overall rating | 3.9/5 | 3.8/5 |
| Value 25% | 96 $0.33 per rated Wh | 41 $0.68 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 100 93% 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% | 37 3,600 W continuous AC | 46 4,000 W continuous AC |
| Charging speed 10% | 32 0-100% on AC in 3 h | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 67 82 Wh per kg (99 lb (45 kg)) | 63 80 Wh per kg (113.5 lb (51.5 kg)) |
| Solar input 5% | 46 2,000 W max solar input | 57 2,600 W max solar input |
| Features 5% | 100 UPS (20 ms), expandable, 100 W USB-C, app | 100 UPS (10 ms), expandable, 100 W USB-C, app |
No independent test published yet.
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 3,790 Wh | 92.5% | Full-discharge AC test; OutdoorGearLab states over 93%, 3790/4096 works out to 92.5%. Recharged from empty in about 3.2 h at about 1600W peak. |
| Growatt HELIOS 3600 | EcoFlow DELTA Pro 3 | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,686 Wh | 4,096 Wh |
| Tested usable capacity | - | 3,790 Wh (93%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 4000+ cycles; end-of-life capacity not stated | 4,000 to 80% |
| Expandable | Yes | Yes, up to 12,000 Wh |
| Output | ||
| AC output | 3,600 W | 4,000 W (8,000 W surge) |
| Boost mode (resistive loads) | 4,500 W | 6,000 W |
| AC outlets | 6 total | 7 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| 120/240V 30A twist-lock (NEMA L14-30R) | - | 1 |
| 240V 20A outlet (NEMA 6-20R) | 1 | 1 |
| USB-C ports | 4 (up to 100 W each) | 2 (up to 100 W each) |
| USB-A ports | 2 | 2 |
| 12 V car outlet | Yes | - |
| DC5521 ports | 2 | 1 |
| UPS / pass-through | Yes (20 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Full AC charge time | 3 h (About 3 h from 120V at 1800W, or 1.5 h from 240V at 3600W (manufacturer)) | - |
| Max solar input | 2,000 W | 2,600 W |
| Solar input voltage | 12-60V | HV 30-150V (1600W) + LV 11-60V (1000W) |
| Build | ||
| Weight | 99 lb (45 kg) | 113.5 lb (51.5 kg) |
| Dimensions | 20.4 x 12.3 x 16.5 in | 27.28 x 16.16 x 13.43 in |
| App | myGro app (Wi-Fi and Bluetooth) | Wi-Fi + Bluetooth |
| Warranty | 5 years | 5 years |
