Technical FAQs 4

What type of cable should a solar system use?

Solar systems use two distinct cable types: ⚠️ Critical: Never use standard THWN wire for DC solar circuits. It lacks UV resistance and proper outdoor ratings required by NEC 690.31. Use only solar-rated PV wire or USE-2 cable for panel connections. 1. System Current Calculate maximum current your wire must carry:

Can a single conductor cable be installed in a solar array?

The 2020 and 2017 editions of the NEC have some direction on the support and management of exposed cables. Article 690 of the NEC, Solar Photovoltaic Systems, allows single conductor cable USE-2 and PV Wire to be installed in exposed locations within the array [NEC 690.31(C)(1)].

How much voltage can a ground-mounted solar array supply?

A ground-mounted solar array supplies 50A at a system voltage of 400V over a 100-meter cable run, with a maximum voltage drop of 2.5%. The desired cable material is aluminum, known for its lower conductivity (k = 40 A·mm²/ (V·m)). First, calculate the allowable voltage drop: 2.5% of 400V = 10V.

How much voltage drop does a solar system need?

Longer distances require larger wire to maintain acceptable voltage drop. Solar systems typically use 2-3% maximum voltage drop for DC circuits. 3. Ambient Temperature High rooftop temperatures reduce wire ampacity. NEC 310.15 (B) (3) (c) requires temperature correction:

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