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Recommended Inverter Cable, Breaker & Fuse Sizing

Determine what size inverter-to-battery cables and DC breaker (or fuse) you should use with an off-grid inverter to install and operate it safely.

Use this table to decide what size battery-to-inverter cables and overcurrent devices (breakers and fuses) to use with your inverter. Remember the fuse and breaker are there to protect your cabling from overheating (and potentially catching fire). You can use smaller cables but only if you in turn use a corresponding smaller breaker or fuse to protect the cable. However, using smaller cables and breaker than what’s suggested can cause problems with your off-grid inverter because the breaker will repeatedly “pop” every time you surge beyond its capacity rating.

Inverter Voltage Continuous Watts Max. Inverter Input Amps (DC) Fuse Size
(DC Amps)
Circuit Breaker
(DC Amps)
Wire Size (AWG)
12V 600 80 80 80 2
800 107 110 110 2
1000 134 200 175 2/0
1500 200 300 250 4/0
2400 320 400 250 4/0
2500 334 400 250 4/0
2800 382 400 250 4/0
3000 400 400 250 4/0
24V 600 40 50 50 8
800 54 75 75 4
1000 67 80 100 2
1500 100 110 110 2/0
2400 160 200 175 2/0
2500 167 200 175 2/0
3000 200 300 250 4/0
3500 230 300 250 4/0
4000 265 300 250 4/0
48V 3000 76 110 110 2/0
3600 90 110 110 2/0
4000 148 200 175 2/0
5500 185 400 250 4/0

Larger cables may used if the distance from your inverter and battery banks is more than 10 feet (~3m).

altE offers battery cables ranging from 1/0 to 4/0 AWG in a variety of lengths for both between your inverter and battery bank and also between your batteries. We also have DC-rated circuit breakers ranging from 1 amp up to 400 amps.

877-878-4060