Browse Topics
Energy
Heating & Cooling
Shelter
Waste & Sanitization
Water
Tools
Energy
Battery Bank Calculator
Estimate the battery capacity required based on daily energy use, autonomy days, system voltage and chemistry.
Solar System Sizer
Size your off-grid solar system based on loads, sun hours, autonomy and voltage.
Heating
Heating Needs Calculator
Estimate required heating power (kW/BTU·h) and daily energy, plus rough wood/propane usage based on area, insulation, ΔT and infiltration.
Water
Rainwater Harvesting
Estimate annual collectible rainwater, daily coverage, and suggested tank size.
Water Tower Pressure
Calculate static water pressure from tank height (head) and convert between kPa, bar and PSI.
All tools →
Community
Reddit
Discord
Glossary
Blog
Account
Log in
Sign up
Battery Bank Calculator
Estimate required battery capacity for your off-grid system.
Back to Tools
Inputs
Daily energy use (Wh/day)
Days of autonomy
System voltage
12 V
24 V
48 V
Battery chemistry
AGM (DoD≈0.50)
LiFePO₄ (DoD≈0.85)
Results
Total capacity required
—
Ah
— usable kWh
Batteries (12V, 100Ah each)
—
units
