Battery Bank Sizing Calculator — Free Online Calculator
Calculate the battery bank capacity needed for off-grid solar systems. Factor in depth of discharge and autonomy days.
How to Use This Calculator
Enter your daily energy consumption, number of backup days, battery type (affects depth of discharge), and system voltage.
The Formula Explained
Bank kWh = (Daily kWh × Days) / DoD. Amp-hours = (Bank kWh × 1000) / System Voltage. Lead-acid batteries should only be discharged to 50%, while lithium can go to 80-90%.