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Capacity class

What a 800Wh power station actually runs

A capacity figure describes what the battery holds, not what reaches your outlet. Reserve and conversion losses take a share before any appliance sees a watt, and the output rating decides what you can plug in at all.

Research by the Power Station Station Editorial Team

Rated capacity
768 Wh
Average across the 2 records in this class.
Usable through AC
608 Wh
After 90% usable capacity and 88% conversion efficiency.
Records in class
2
Each one source-checked against the manufacturer’s own published specifications.

Our answer

A 800Wh station delivers roughly 608Wh through its AC outlets once reserve and conversion losses are taken out, which is what actually drains during an outage.

Current records in this class

Capacity puts these records on the same shelf, not on equal footing. Continuous output, published surge behaviour, solar acceptance, and carrying weight reveal the practical differences.

Source-checked power station records in the 800Wh class
RecordCapacityContinuous outputPublished peakWeight
EcoFlow RIVER 2 Pro768 Wh800 W1,600 W18.2 lb
BLUETTI AC70768 Wh1,000 W1,500 W22.5 lb

A record with no published peak needs model-level verification before a motor start can be relied on.

What this much energy buys you

Each figure is calculated against a station in this class using the same visible planning profile. They are calculations rather than measured results, and a load with a motor still has to clear its startup demand first.

  • Household refrigerator: about 12 hours on the EcoFlow RIVER 2 Pro.
  • Chest freezer: about 21 hours on the EcoFlow RIVER 2 Pro.
  • Upright freezer: about 14 hours on the BLUETTI AC70.
  • Mini fridge: about 28 hours on the BLUETTI AC70.
  • 12V portable fridge: about 37 hours on the EcoFlow RIVER 2 Pro.
  • Starlink Mini: about 18 hours on the EcoFlow RIVER 2 Pro.
  • Wi-Fi router and modem: about 34 hours on the EcoFlow RIVER 2 Pro.
  • Laptop computer: about 15 hours on the BLUETTI AC70.
  • Television: about 7.2 hours on the BLUETTI AC70.
  • CPAP machine: about 17 hours on the EcoFlow RIVER 2 Pro.

When to move up a class, and when not to

Move up when a full day of use exceeds the delivered AC energy above, when a load runs for long unbroken periods, or when you cannot count on recharging between uses.

Do not move up to solve an output problem. If an appliance exceeds the continuous rating, or starts harder than the inverter can supply, a larger battery in the same output class changes nothing. Capacity and output are separate specifications.

Continue through this cluster

Use the next page that answers your unresolved constraint

The 500Wh class belowLess weight and lower cost, if the energy still covers the plan.The 1,000Wh class aboveMore delivered energy when a full day of use runs past this class.Every current product recordCompare the full database across capacity classes.Appliance power requirementsStart from the load rather than the hardware.Calculated runtime answersSee every station measured against every load.Outage load plannerSize a whole outage plan rather than one appliance.Portable power guide hubBrowse completed capacity, electrical, appliance, and planning guides.

Evidence used on this page

Important fields are tied to a specific source. Manufacturer claims, government guidance, calculations, and planning assumptions remain separate.

  1. Capacity, output, surge, chemistry, cycle life, solar input, weight, and EPS transfer time checked.

    official product page

  2. Capacity, output, surge, chemistry, cycle life, solar input, weight, UPS, expansion support, and warranty checked.

    official product page