Batteries & storage calculators
Home batteries, backup time, off-grid banks, pumped hydro and storage economics.
Solar battery size & payback
Simulates your solar panels, your household’s hourly demand and a home battery for all 8,760 hours of a real year at your location, then finds the battery size that actually pays off.
live data Batteries & storageBattery runtime
Runtime of any battery (power station, home battery, UPS or 12 V bank) from capacity, depth of discharge, inverter losses, temperature and age, with Peukert’s law for lead-acid batteries.
Batteries & storageOff-grid solar sizing
Sizes a complete stand-alone solar system from your appliances. It designs for the darkest month at your location using NASA satellite climate data, days of autonomy and real battery chemistry limits.
Batteries & storageBattery bank sizing
Works out how many kWh and amp-hours your battery bank needs (with margins for depth of discharge, temperature, ageing and efficiency) and how to wire your chosen batteries in series and parallel.
Batteries & storagePumped hydro storage
Turns reservoir volume, head and machine efficiencies into MWh stored, round-trip efficiency, hours of discharge, drawdown, arbitrage revenue and levelized cost of storage.