Cold Storage preset for the Solar Battery Bank Sizer: 2 days autonomy. Pre-filled inputs Daily Load Wh 15000, System Voltage 48, Autonomy Days 2.
Pre-filled Inputs
Exact preset input values
Daily Load Wh
15000
System Voltage
48
Autonomy Days
2
Depth Of Discharge
0.7
Peak Sun Hours
4
Governing Formulas
Engineering formulas used by this calculator
Expression
Result
E_req = (E_daily × days) ÷ η_inv
Required energy (Wh)
E_bank = (E_req ÷ DoD) × k_temp
Nameplate bank energy (Wh)
Ah_bank = E_bank ÷ V_sys
Bank capacity (Ah)
I_max = (P_cont ÷ V_sys) × η_inv × 1.25
Max continuous amps (A)
Frequently Asked Questions
How do I size a solar battery bank for off-grid use?
Multiply the daily energy by the autonomy days, divide by the inverter efficiency, then divide by the depth of discharge and temperature derating.
What depth of discharge should I use for LiFePO4?
LiFePO4 banks are typically sized to 80–90% depth of discharge, while lead-acid banks are limited to about 50% to protect cycle life.
How is the battery cable and fuse size chosen?
The maximum continuous current is multiplied by a 1.25 safety factor, then matched to a copper conductor ampacity and a Class-T fuse per NEC 310.16 and NEC 240.6.