ALLPOWERS R3500
#19 in Home backupFull review
For home backup on a budget where the unit stays in one place, with room for a second battery later.
ALLPOWERS $1,424$1,424
3.7/5
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.
- 3,600 WhCapacity
- 3,600 WAC output
- 99 lbWeight
- LiFePO4Battery
- 2 h 42 minFull charge
- $0.50Price / Wh
Check price at Amazon$1,799Check price at EcoFlow$1,799
Price checked October 20, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Delivered about 3 kWh in independent testing, enough to keep a fridge running for days
- Expands to 25 kWh as part of an EcoFlow backup system
- 1600W solar input with a wide 11-150V window takes long panel strings
- Plenty of outputs including an Anderson port for 12V gear
Cons
- 99 lb, hard to lift into a vehicle
- USB-C limited to 100W, and it drew 21W idle in testing
- Costs more than the newer DELTA 3 Ultra for similar capacity
How it scores
The rating comes from 8 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Independent capacity tests
Usable energy delivered from a full charge through the AC outlets, as measured by independent reviewers. Inverter losses mean no station delivers its full rated capacity.
| 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
| Battery | |
|---|---|
| Rated capacity | 3,600 Wh |
| Tested usable capacity | 3,042 Wh (84%) |
| Chemistry | LiFePO4 |
| Cycle life | 3,500 to 80% (6,500 to 50%) |
| Expandable | Yes, up to 25,000 Wh |
| Output | |
| AC output | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | 4,500 W |
| AC outlets | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 |
| RV 30A outlet (TT-30R) | 1 |
| AC waveform | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) |
| USB-A ports | 4 |
| 12 V car outlet | Yes |
| DC5521 ports | 2 |
| Charging | |
| AC charging | 1,800 W |
| Full AC charge time | 2 h 42 min (2.7 h at 1800W on 120V; 1.8 h at 3000W on 240V) |
| Max solar input | 1,600 W |
| Solar input voltage | 11-150V, 15A |
| Build | |
| Weight | 99 lb (45 kg) |
| Dimensions | 25 x 11.2 x 16.4 in |
| App | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years |
Alternatives in this size
EcoFlow DELTA 3 Ultra Plus
#20 in Home backupFull review
A wheeled 3kWh home-backup station that can grow to 11 kWh and charge fast from solar. The pick in this line for off-grid cabins and longer outages.
Amazon $1,599 EcoFlow $1,599$1,599
Anker SOLIX F3800
#22 in Home backupFull review
For homeowners who want 240V backup that can grow into a whole-home battery, and who do not need the extra solar input of the F3800 Plus.
Amazon Anker $2,199.99$2,199.99
Compare
Compare the EcoFlow DELTA Pro with any other portable power station →
More from EcoFlow: every EcoFlow product ranked.