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How Long Will a 100Ah Lithium Battery Run an RV?

At 12.8V, a 100Ah battery stores about 1,280Wh before usable-depth and conversion assumptions. Divide usable watt-hours by the real load in watts for an estimate.

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WeRV Power answer

Estimate runtime from voltage, usable capacity, appliance watts and inverter loss.

What to verify

Use the result as a planning range. Exact fitment and installation must be checked against the vehicle, equipment and selected battery manufacturer.

List DC and AC loads
Include inverter loss
Use manufacturer discharge limits
Allow reserve
Expect temperature and duty-cycle variation

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POWER TOOLS

Run the numbers before you buy.

All outputs are planning estimates. Exact product specifications and installation requirements control.

Battery runtime

Capacity (Ah)VoltageLoad (watts)Chemistry AC load through inverter5.1 hoursApproximate runtime at a constant load.

Series / parallel bank

Battery countEach battery voltageEach battery AhBatteries in each series string12V · 200Ah · 2,400Wh1 in series × 2 parallel strings

Cost per usable energy cycle

Battery cost ($)Rated cyclesCapacity (Ah)Chemistry$1.000 / usable kWh-cycleUses entered cost and cycles; compare exact manufacturer data.

Core value estimate

QuantityApprox. weight each (lb)Current confirmed rate ($/lb)$0.00Estimate only. Actual core credit depends on battery type and the current program.

Sources and limits

Exact battery specifications, cycle life, charging profiles and fitment must be verified against the selected manufacturer’s current datasheet and the equipment maker’s requirements. The planning formulas are visible so a technician can review the assumptions.

Battery-system selection and maintenance guidance ↗ · Prime Battery Solutions product categories ↗