Round that to the nearest available size which is 225 or 250A. If you have a 2000W 12V system, the process is similar. Round off 104.1 amps to the nearest breaker size of 110A. Most 2000W inverters use 24V so assuming you have that: The steps are the same but this time you use the battery voltage, which can be 12V, 24V or 48V. Now suppose you want to run the inverter with a solar array and batteries. You could probably get away with a 20A breaker, but for safety go with the next largest circuit breaker size which is 25A. Now multiply this by 1.25 to get the circuit breaker size: If you load 1500 watts into the inverter, use that instead of 2000 watts. Use the watt load, not the inverter capacity. We do that by dividing the watt load by the voltage. If you have a 2000 watt inverter like the Voltworks Power Inverter running off 120V AC, its current output is 16.6A and you need a 25A circuit breaker.įirst we need to find the inverter current or amp output. You can increase the fuse multiplier to 2.5, though the inverter should be fine with 1.75. Inverter current output x 1.75 = fuse size If you prefer a fuse, use this conversion: Inverter current output x 1.25 = circuit breaker size And they are applicable whether you run the inverter from 120V AC or 12V/24V battery banks, at 2000 watts or other sizes. How to Calculate Circuit Breaker Sizes for Inverters You cannot use a smaller wire because the circuit breaker carries excess current during a surge and could damage the inverter. ![]() If you are going to install a 2000W inverter for instance, make sure you have the right circuit breaker to protect your appliances.Ī 2000 12V watt inverter requires a 250A circuit breaker and a 2/0 AWG size wire. For more details, click here.Ĭircuit breakers and fuses are used in virtually every electrical system, and inverters are no exception. As an Amazon Associate, this site earns commissions from qualifying purchases.
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