String Inverter Configuration Calculator

Configure string inverter MPPT inputs with module strings, checking voltage and current compatibility.

Input Parameters

Results

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Max Modules/String
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Max Strings/MPPT
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Total Modules
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String Voltage (STC)
V
Note: NEC 690.8 requires 125% Isc for conductor and overcurrent protection sizing. Each MPPT input tracks independently.

Reference

Voc_cold ≈ Voc × 1.14 (for −10°C correction) Max Modules/String = floor(MPPT_max_V / Voc_cold) Max Strings/MPPT = floor(MPPT_max_I / (Isc × 1.25)) NEC 690.8: Isc × 1.25 for conductor sizing Total Modules = Mod/Str × Str/MPPT × MPPTs