LED Cable Voltage Drop Calculator

LED cable voltage drop calculator

Long low voltage cable runs lose voltage, so the LEDs at the end look dimmer. Enter your load and cable length to see the drop and the cable size you need.

Supply voltage12V DC24V DC

Load on this cable (W)

Cable length, supply to LEDs (m)

Cable size0.50.751.01.52.54.0

Most drop you'll accept (%) 3% (best for even brightness)5% (usual limit for LEDs)

Copper cable, length measured one way from the supply to the first LED; the calculation allows for the return. It ignores the voltage lost inside the module or strip runs themselves, so keep within the maximum run length for your LEDs. Need help? Call 01892 783 900.

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