Solar + Battery Sizing Calculator

Determine how many solar panels and battery capacity you need based on daily energy use, peak sun hours, and desired autonomy.

Daily Energy Use (Wh)

Peak Sun Hours (h/day)

Panel Wattage (W each)

Battery Capacity (Ah per unit)

System Voltage (V)

Days of Autonomy

Battery Depth of Discharge (%)

Panels Needed

panels

Total Panel Watts

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Battery Bank (Ah)

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Battery Units Needed

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Daily Solar Production

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Solar + Battery Sizing

Panels = Daily Wh / (Panel W × Sun Hours × 0.80)

Battery Ah = (Daily Wh × Days) / (Voltage × DoD)

0.80 factor accounts for system losses

Battery life.

V=IR.

Turns ratio.

PCB trace.

Op-amp gain.

Convert units.