DC Cable Sizing Calculator

PV string voltage, voltage-drop and derated ampacity checks

Handy Tools
String open-circuit voltage at STC–V
Maximum module voltage–V
Maximum string voltage–V
Array operating current–A
Array short-circuit current–A
Maximum array short-circuit current–A
Cable resistance at 20°C–Ω/km
DC voltage drop–V
DC voltage drop–%
Base cable capacity–A
Derated cable capacity–A
Per-string design current–A
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–All displayed checks must pass; final engineering verification remains mandatory.
Important: This is a preliminary engineering planning tool derived from the supplied JETS workbook. The workbook’s reference tables are used internally and are intentionally not displayed. Confirm manufacturer data, AS/NZS 5033 requirements, AS/NZS 3008 installation and derating assumptions, protective-device coordination, inverter limits, route conditions and current editions of all applicable standards before design, procurement or installation.