Our solar battery bank calculator helps you determine the ideal battery bank size, watts per solar panel, and the suitable solar charge controller. If you choose to build an off-grid system, it's important to size your system based on the month with the least amount. Sizing a solar battery bank comes down to four numbers: your daily energy use, the number of days you want to go without sun, your battery's usable depth of discharge, and your system voltage. High charge and discharge efficien-cy, reducing equipment downtime and saving more time. Real-time monitoring of PDU for better system protection.