Solar Cable Voltage Drop Calculator
Estimate PV circuit voltage drop, drop percentage, and remaining margin to a 3 percent reference from entered current, resistance, length, and system voltage.
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PV string voltage, current, cable voltage drop, and charge-controller checks.
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PV String Voltage Calculator
Estimate cold PV string Voc and STC Vmp, then compare string voltage with an entered inverter maximum for preliminary equipment review.
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Charge Controller Size Calculator
Calculate array current, margin factor, and recommended controller current from PV array watts, battery voltage, and sizing margin.
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PV String Current Calculator
Separate module operating or short-circuit current from the effect of parallel PV strings, with an explicit adjustment factor and screening limit.
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Solar String Calculator
Compares PV string module counts against cold-weather Voc and inverter MPPT voltage limits using module data, temperature assumptions, and equipment voltage ratings.
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