Sizing a stationary bank: night load, recharge window, inverter and backup.
Sizing from the night load and recharge window
Size from what you use after sunset, then check the array can refill it before the next evening.
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Inverter, MPPT and system integration
Both the inverter and the MPPT need the pack’s charge profile, and the inverter needs the BMS protocol.
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Questions
Short answers to the ones that come up most.
How do I size a storage bank?
Multiply the nightly load in kWh by the days of backup you want, then add inverter losses.
Do I need a hybrid inverter?
For most modern systems, yes — it handles solar, grid and battery with one profile.
What is the biggest design mistake?
Sizing from the array instead of the load.
