Tools

Backup power calculators

Estimate battery runtime, check running and startup demand, or calculate an optimistic solar recharge ceiling. These client-side estimates use cited inputs and the site’s formulas, not lab tests or an electrical engineering design.

Available now

Generator and Power Station Wattage Calculator

Pick appliances, change quantities, or enter your own loads. Compare the running total with the demand when one motor starts while the other loads stay on. The calculator also flags loads marked as needing 240 V in Honda’s table.

Power Station Battery Runtime Calculator

Enter battery capacity, efficiency, and average load to estimate hours. Add a target duration for required Wh, or opt into the stricter AC180-form illustration and published-capacity comparisons.

Solar Panel and Power Station Recharge Calculator

Enter panel watts, the station’s solar-input cap, and peak sun hours from PVWatts for an optimistic daily Wh ceiling. Add a target battery Wh to estimate ideal recharge sun-hours, with no conversion loss.

Appliance Electricity Cost Calculator

Calculate period kWh and cost from watts, hours, days, and the price per kWh on your bill. Add an EnergyGuide annual kWh figure to see its implied average watts and annual cost.

RV and Van Electrical Planner

Add cited or custom loads and hours per day to estimate daily battery watt-hours and amp-hours at 12 V or 24 V. AC loads use the 0.85 planning efficiency; DC loads on the same bus do not. The planner also runs the one-at-a-time starting-watt check.

Power Station Sizing Calculator

Build an energy budget from an appliance list and hours of use, then check running and starting watts against a station you enter or against published 1 kWh-class specs. Required watt-hours are rounded up to a whole number.