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Free Solar String Sizing

Determine the maximum number of PV panels you can safely wire in a series string based on inverter voltage limits and cold temperature adjustments.

Configuration

Inv Max V

Panel Voc

Min Temp C

How to Use

Enter the Inverter's Maximum Input Voltage.
Enter the Solar Panel's Open Circuit Voltage (Voc).
Enter the lowest expected ambient temperature in Celsius.
The tool adjusts for cold-weather voltage rise and tells you the max panels per string.

Common Use Cases

PV Design

Frequently Asked Questions

Why does temperature matter?

Solar panel voltage increases as temperature drops. If you don't account for the coldest day, you might exceed the inverter's voltage limit and damage it.

What is Voc?

Voc (Voltage Open Circuit) is the maximum voltage a panel produces when no load is connected. This is found on the panel's spec sheet.

Pro Tip

Coldest temp determines max V.

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Free Solar String Sizing Tool - Online Tools | ConfigGen