Solar PV Array & MPPT Controller Sizer

Calculate required panel wattage, module counts, and MPPT charge current.

Daily Energy To Replenish (Wh) Total daily consumption to replace each day.

Battery Bank Voltage Charge controller battery output voltage.

Peak Sun Hours (PSH) Winter avg: 2.5–3.5 hrs. Summer avg: 4.5–6.0 hrs.

System Loss Margin Wiring voltage drop, panel heat derating, dust, and controller losses.

RECOMMENDED SOLAR PV ARRAY

313 Watts

Array targets 1,250 Wh daily harvest to guarantee full battery recharge.

MPPT Rating (NEC Rec)

40A

26.1A continuous (125% continuous duty)

Technology

MPPT Buck

+30% vs PWM in clouds/winter

Engineering Scope & Formulas

Generates panel counts for 100W, 200W, and 400W modules and standard MPPT ratings (20A, 30A, 40A, 60A, 80A, 100A).

Array Watts = (Daily Wh ÷ (1 - System Loss)) ÷ Peak Sun Hours; Controller Amps = (Array Watts ÷ Battery Voltage) × 1.25

Deep dive into the electrical theory, wire gauge charts, and thermal derating behind this calculator in our field guide:
Read the complete guide →