The Growatt HELIOS 3600 is the better portable power station overall, rated 3.9 to 3.8. The Growatt HELIOS 3600 leads on value and portability. The EcoFlow DELTA Pro Ultra wins on AC output and solar input. The Growatt HELIOS 3600 costs $3,000.02 less ($1,198.98 vs $4,199).
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 $1,599A modular 6kWh home-backup system for buyers who need 240V output and plan to expand. Overkill for camping or short outages.
Amazon $4,199 EcoFlow $4,199Prices 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 Ultra |
|---|---|---|
| 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) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 100 LiFePO4, 4,000 cycles, 5-year warranty | 96 LiFePO4, 3,500 cycles, 5-year warranty |
| AC output 15% | 37 3,600 W continuous AC | 100 7,200 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)) | 54 75 Wh per kg (181.8 lb (82.4 kg)) |
| Solar input 5% | 46 2,000 W max solar input | 90 5,600 W max solar input |
| Features 5% | 100 UPS (20 ms), expandable, 100 W USB-C, app | 100 UPS (0 ms), expandable, 100 W USB-C, app |
| Growatt HELIOS 3600 | EcoFlow DELTA Pro Ultra | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,686 Wh | 6,144 Wh |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 4000+ cycles; end-of-life capacity not stated | 3,500 to 80% |
| Expandable | Yes | Yes, up to 30,000 Wh |
| Output | ||
| AC output | 3,600 W | 7,200 W (10,800 W surge) |
| Boost mode (resistive loads) | 4,500 W | - |
| AC outlets | 6 total | 6 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 | - |
| AC waveform | - | Pure sine wave, 120/240V split phase |
| 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 | - |
| UPS / pass-through | Yes (20 ms switchover) | Yes (0 ms switchover) |
| Charging | ||
| AC charging | 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 | 5,600 W |
| Solar input voltage | 12-60V | High-voltage 80-450V (4000W) and low-voltage 30-150V (1600W) |
| Build | ||
| Weight | 99 lb (45 kg) | 181.8 lb (82.4 kg) |
| Dimensions | 20.4 x 12.3 x 16.5 in | Inverter 27.2 x 18.9 x 8.4 in; battery 26 x 18 x 8 in |
| App | myGro app (Wi-Fi and Bluetooth) | EcoFlow app (Bluetooth, Wi-Fi and 4G) |
| Warranty | 5 years | 5 years |
