Runtime calculator

Estimate how long a power station will run your device.

Enter battery watt-hours, device watts, inverter efficiency, and reserve. The result is a practical runtime estimate before comparing 300Wh, 500Wh, or 1000Wh power stations.

Estimated runtime7.2 hours

A 500Wh class unit can cover this load for part of a day.

Inputs

Battery and load

Known power station (optional)Selecting a model fills its published capacity and AC output limits. You can still edit every field.Power station capacityUse the listed watt-hours, such as 300Wh, 500Wh, or 1000Wh.Device running wattsUse measured watts if you have them. Labels can be rough.Inverter/load efficiencyAC loads often waste more energy than DC or USB loads.Battery reserveReserve helps avoid planning around every last watt-hour.Planned runtime targetUsed to estimate the battery size needed for your goal.Startup surge wattsUse for fridges, pumps, compressors, and other motor loads.Station continuous AC outputUse the current manual's continuous output rating. Leave at 0 if unknown.Station surge outputUse a published surge rating, not a separate power-lifting mode.

No model preset selected. Manual inputs are being used.

Why runtime changes

Power station runtime depends on usable battery capacity, inverter losses, device cycling, temperature, battery age, and startup surge. Treat this as a planning estimate, then check the manual and real device wattage.

Source-verified presets

Published capacity and AC output ratings

These presets make model-specific runtime comparisons faster. Ratings are transcribed from the linked manufacturer page or manual and should be rechecked before purchase.

Power station	Capacity	Continuous AC	Surge	Source checked
EcoFlow RIVER 2	256Wh	300W	600W	2026-07-16
Jackery Explorer 300 Plus	288Wh	300W	600W	2026-07-16
EcoFlow RIVER 2 Pro	768Wh	800W	1600W	2026-07-16
BLUETTI AC70	768Wh	1000W	Not listed	2026-07-16
EcoFlow DELTA 2	1024Wh	1800W	2700W	2026-07-16
Jackery Explorer 1000 v2	1070Wh	1500W	3000W	2026-07-16
BLUETTI AC180	1152Wh	1800W	2700W	2026-07-16

Runtime notes

What the runtime estimate is actually checking

The most useful number is not only battery capacity. A 500Wh power station does not always deliver 500Wh to an AC device, and a motor load may need more startup power than its average running watts suggest.

Watt-hours

Capacity is the fuel tank

Higher watt-hours usually means longer runtime, but reserve settings, inverter losses, and high loads reduce the usable amount.

Watts

Load size sets the burn rate

A 45W fan and a 90W TV can have very different runtime on the same battery. Measure the real load when possible.

Surge

Starting power can be the dealbreaker

Fridges, pumps, compressors, and tools can spike when they start. Check surge output before shopping by runtime alone.

Related checks

Match runtime, load size, and recharge time

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