OUPES Mega 3

~$1,199approx. list price

800 WLights, phones, router, a CPAP
2,200 WFridge, freezer and the essentials
4,000 WFurnace blower, sump pump or a window AC
7,500 WWell pump or a small central AC
18,000 WWhole home with central air

3,600 W running, 7,000 W surge — sustains the fridge, freezer and the essentials tier and everything below it.

Best forHomeowners who want a 3 kWh station with a 30 A RV outlet that can run a refrigerator, well pump and furnace without paying for a wall battery.

The Mega 3 is the big OUPES: 3,072 Wh of LiFePO4, a 3,600 W inverter with a 7,000 W surge, five 20 A outlets plus a TT-30R, and expansion to 15.36 kWh with up to six B2 packs. It is roughly the middle of the portable class between a 2 kWh camping unit and a whole-home battery, with a built-in trolley wheel and handle because it weighs 83.3 lb. Recharge is 1,800 W from AC or 3,900 W with AC and solar together, which OUPES quotes as about an hour to full. The UPS function is limited to 2,200 W with under 20 ms changeover, so the 3,600 W figure applies to normal operation and not seamless backup. The TT-30R takes an RV cord but is 120 V only, so it does not feed a 240 V transfer switch. OUPES shows $2,299 struck through and charges $1,199. The negatives are the same as the brand's: a small US service network, no published noise number, and less outage history than EcoFlow or Bluetti.

From the spec sheet

Specifications

Battery capacity: 3,072 Wh
Expandable to: 15,360 Wh
Continuous output: 3,600 W
Surge output: 7,000 W
Runtime: Fridge (~150W): ~16 hrs on base unit; ~80 hrs with six B2 packs

Type: Power Station
Fuel: Battery (LiFePO4)
Outlets: 5x 120V 20A (5-20R), 1x TT-30R 120V 30A, 2x USB-C PD 100W, 4x USB-A QC 3.0, 12V Anderson 30A, car 12V 10A, 2x DC5521
Transfer-switch ready: No
Weight: 83.3 lbs
Warranty: 5-year, 6 with free registration
Model: OPS-PW-MEGA 3