How To Calculate Fuse Size Needed. Enter values in the calculator below. Also note that the fuse size can be designed at any Amps rating which is depending on the manufacturer.
Consult the NEC and its guidelines for overcurrent protection. The type of fuse you use will depend on the current capacity needed and your own preference. The rule of thumb that we use here would be Continuous Watts Battery Voltage times 125 for example a typical 1000W 12V inverter draws up around 83 continuous amps and we would add the 25 safety factor which comes out to 105 Amps so we.
The product page says these are 3 watts each.
As the majority of DC-DC converters use circuit-sensing current limits or thermal overload circuits to protect against short-circuits a fuse size calculator will. Since the feeder circuit splits into branch circuits calculating the correct main fuse size is a bit more complicated. So with an amperage rating of 260 amps a fuse sized at 325 amps or less should work. A 10A fuse is pushing it and with a 20A fuse you may as well use a copper pre-1982 penny.
