☀️ NEC 690.7 Max Voltage Voc @ -20°C & Inverter MPPT Operating Window (480-800V)

Commercial Solar PV String Inverter Calculator

Size commercial rooftop photovoltaic (PV) module strings under NEC Article 690.7: calculate cold-weather maximum open-circuit voltage (Voc_max = Voc x [1 + TempCoeff x (Tmin - 25°C)] preventing 1,000V/1,500V inverter DC overvoltage damage), optimize string length within inverter MPPT operating windows, and solar engineering profits.

1. Project & Operating Inputs

Total Commercial PV Capacity (kW DC e.g. 750 kW Rooftop Array)

Module Open-Circuit Voltage Voc (Volts e.g. 49.5V STC Module Voc)

Customer Bid Price for Supplied & Racked Solar Installation ($)

Tier-1 Mono PERC Panels, 125kW 1500V String Inverters, Racking & Labor ($)

2. Financial Breakdown & Yield

NEC 690.7 SOLAR STRING MPPT

Turnkey Commercial Solar Array Profit

Solar EPC Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost