Solar DC Cable Loss Calculator

How Solar DC Cable Loss works

The governing expression is loss = I²R. Solar DC Cable Loss uses Array current, Circuit resistance to report DC cable loss.

With the loaded values, dC cable loss evaluates to 67.50 W. Vary one measured quantity so the source of the difference stays clear.

Inputs for Solar DC Cable Loss

Array current and Circuit resistance belong to Solar DC Cable Loss. Keep source units with array current.

Sample entries show the formula in use. They are not substitute ratings for selected equipment.

Array current

Example entry: 15 A.

Circuit resistance

Example entry: 0.3 Ω.

Reading the Solar DC Cable Loss result

This output represents Solar DC Cable Loss.

Keep the calculated requirement separate from the rating ultimately selected.

Measurement and units

Use site-specific irradiance, temperature, shading, equipment limits, and measured system losses. Check prefixes on array current. Compare this result with MPPT Voltage Window Calculator when available voltage margin is also needed.

A fair comparison keeps units, measurement point, and operating condition consistent.

Limits of this calculation

Use round-trip conductor resistance at operating temperature.

The calculation focuses on the named relationship and its entered variables. Unentered effects remain outside Solar DC Cable Loss.

A useful Solar DC Cable Loss comparison

Save the initial dC cable loss before adjusting array current. A low and high case is more informative than adding an unexplained safety factor after the calculation.

Document the alternate array current source.

Solar DC Cable Loss record notes

Record source and operating details for array current.

Retain raw dc cable loss beside its selected rating.

Questions about Solar DC Cable Loss