OUPES Mega 3
#5 in Home backupFull review
A big home-backup station with a 3600W inverter, RV outlet and massive solar input, for households that want to run large appliances through outages.
OUPES $1,199$1,199
4.0/5
A 240V home-backup station for buyers who want to run a home circuit or well pump through outages at a lower price than the big-name brands.
- 5,222 WhCapacity
- 7,200 WAC output
- 154.3 lbWeight
- LiFePO4Battery
- 3 h 30 minFull charge
- $0.47Price / Wh
Check price at Amazon$2,449Check price at FOSSiBOT$2,899
Price checked October 20, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 240V output for well pumps, dryers and transfer-switch home backup
- 3,700W of combined solar input across two ports
- 5.2kWh battery expands to about 15.7kWh
- Five-year warranty
Cons
- At 154 lb it stays where you put it
- Slow 3.5-hour recharge from a normal 120V outlet
- No 12V car outlet
- Prices differ by about $450 between Amazon and FOSSiBOT’s store
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.
Specifications
| Battery | |
|---|---|
| Rated capacity | 5,222 Wh |
| Chemistry | LiFePO4 |
| Cycle life | 6,500 to 80% |
| Expandable | Yes, up to 15,667 Wh |
| Output | |
| AC output | 7,200 W (9,000 W surge) |
| AC outlets | 6 total |
| 120V 20A outlets (NEMA 5-20R) | 4 |
| 120/240V 30A twist-lock (NEMA L14-30R) | 1 |
| 120/240V 50A outlet (NEMA 14-50R) | 1 |
| USB-C ports | 2 (up to 100 W each) |
| USB-A ports | 1 |
| 12 V car outlet | No |
| UPS / pass-through | Yes (10 ms switchover) |
| Charging | |
| AC charging | 1,800 W |
| Full AC charge time | 3 h 30 min (Manufacturer: about 3.5 hours at 120V; 3000W at 240V in about 2.2 hours) |
| Max solar input | 3,700 W |
| Solar input voltage | 120-450V, 2500W (HV) + 12-55V, 1200W (LV) |
| Car charging | 200 W |
| Build | |
| Weight | 154.3 lb (70 kg) |
| Dimensions | 26.4 x 17.7 x 16.1 in |
| App | FOSSiBOT app |
| Warranty | 5 years |
Alternatives in this size
FOSSiBOT F3600 Pro
#6 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
Jackery HomePower 3600 Plus
#8 in Home backupFull review
For home-backup buyers who want large tested capacity at a lower price per watt-hour than most 3 kWh-plus units.
Amazon $1,709 Jackery $1,899 Outbound Power$1,709
Compare
Compare the FOSSiBOT F7200 with any other portable power station →
More from FOSSiBOT: every FOSSiBOT product ranked.