Battery & Storage Calculators

What battery size for your loads and backup hours?

Amp-hours and watt-hours for your battery bank.

Lead-acid vs lithium — the right capacity.

Battery + solar for self-consumption and backup.

Lithium (Li-ion/LiFePO4) sizing.

LiFePO4 specific sizing with cycle life.

Convert between Ah, Wh, and kWh.

Watt-hours from amp-hours and voltage.

How long will your battery last under load?

Hours to charge from solar.

DoD impact on battery life and usable capacity.

Capacity conversions and runtime estimates.

How many Powerwalls for your home?

Backup power for outages — hours of coverage.

How many days can you run without sun?

Configure your battery bank wiring.

Use your EV battery to power your home with vehicle-to-home technology.

Compare sodium-ion, LFP, and lead-acid batteries for solar storage.

Optimize battery charge/discharge schedule for time-of-use rates.

Compare LFP, NMC, LTO, Na-ion, and lead-acid side-by-side.

Capacity derating at cold and hot temperatures for LFP, AGM, NMC.

Estimate lifespan, total cycles, and cost per kWh delivered.

Estimate state of charge from voltage reading.

Size and compare 1-4 Powerwalls with TOU arbitrage.

Modular 5kWh battery system sizing.

Side-by-side battery comparison tool.

Side-by-side home battery comparison for Powerwall 3 and FranklinWH aPower.

3-way portable power station comparison.

Portable vs fixed home backup comparison.

Full total cost of ownership comparison.

$/kWh comparison with inverter bundling.

With ATS and generator ecosystem comparison.

Premium portable power station comparison: capacity, recharge speed, and expandability.

3-way home battery comparison: $/kWh, inverter bundling, and backup capability.

Modular LiFePO4 best value battery sizing.

Panel + station bundle sizing for Bluetti systems.

RESU Prime + FLEX modular battery system sizing.

SBR/SBH stackable LFP battery system sizing.

Best budget LFP modular battery sizing.

Made-in-USA option with lowest $/kWh battery sizing.