THE TOOLBOX · 12 FREE CALCULATORS
What would you like
to work out?
From battery runtime to solar output. Choose a question, enter your numbers, and see what they mean.
12 calculators
Battery
Battery Runtime
How long will your battery last?
Open calculator BatteryBattery Capacity
Find the capacity your plan needs.
Open calculator BatteryBattery Backup
Add up your everyday backup loads.
Open calculator ConversionsAmp-Hour
Connect current, capacity and time.
Open calculator ConversionsWatt-Hours to Amp-Hours
Translate battery capacity units.
Open calculator BatteryBattery Charging Time
Estimate the time to recharge.
Open calculator ConversionsWatt-Hours
Turn power over time into energy.
Open calculator SolarSolar Panel Output
Estimate a day of solar production.
Open calculator SolarSolar Panel Size
Find the array behind your energy goal.
Open calculator Portable powerPortable Power Station Size & Runtime
Match the numbers to portable power.
Open calculator ConversionsWatts, Volts & Amps
Solve power, voltage or current.
Open calculator BatteryBattery C-Rate
Understand current relative to capacity.
Open calculatorNo calculators match. Try “battery”, “solar”, or clear your search.
Clear assumptions, not false certainty.
All tools include a formula, a worked example and the limits of the estimate. Read our methodology.