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Capacity class

What a 300Wh 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
290 Wh
Average across the 3 records in this class.
Usable through AC
230 Wh
After 90% usable capacity and 88% conversion efficiency.
Records in class
3
Each one source-checked against the manufacturer’s own published specifications.

Our answer

A 300Wh station delivers roughly 230Wh 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 300Wh class
RecordCapacityContinuous outputPublished peakWeight
EcoFlow RIVER 3 Plus286 Wh600 W1,200 W10.4 lb
Anker SOLIX C300288 Wh300 WNot published9.1 lb
Goal Zero Yeti 300296.96 Wh350 W600 W13.7 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 4.4 hours on the EcoFlow RIVER 3 Plus.
  • Chest freezer: about 7.8 hours on the EcoFlow RIVER 3 Plus.
  • Mini fridge: about 11 hours on the Goal Zero Yeti 300.
  • 12V portable fridge: about 14 hours on the EcoFlow RIVER 3 Plus.
  • Starlink Mini: about 6.9 hours on the EcoFlow RIVER 3 Plus.
  • Wi-Fi router and modem: about 13 hours on the EcoFlow RIVER 3 Plus.
  • Laptop computer: about 5.9 hours on the Goal Zero Yeti 300.
  • Television: about 2.8 hours on the Goal Zero Yeti 300.
  • CPAP machine: about 6.5 hours on the EcoFlow RIVER 3 Plus.
  • Pellet stove: about 1.9 hours on the EcoFlow RIVER 3 Plus.

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 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 UPS checked.

    official product page

  2. Product-family warranty statement checked.

    official product page

  3. Capacity, output, SurgePad rating, ports, weight, warranty, and UPS read from the rendered comparison table. The solar voltage window comes from the same page’s published FAQ.

    official product page

  4. Published specification table: battery pack capacity, cell chemistry, lifecycles, inverter continuous and surge output, solar input window, weight, and warranty.

    official product page