Recommended Inverter Cable Sizing and Breakers or Fuses

Determine what size cable and breaker (or fuses) you should use with your inverter to install and operate it safely.

Recommended Inverter Cable and Breaker or Fuse Sizes

Use this table to decide what size cable and fuse or breaker 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 inverter because the breaker will repeatedly "pop" everytime 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)
12 Volt
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
24 Volt
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
48 Volt
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 2/0 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.

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