Fuses

3.5.4 Fuse Protection In The Battery Circuit

A battery is an unlimited source of current. Under short circuit conditions, a battery can supply thousands of Amperes of current. If there is a short circuit along the length of the cables that connects the battery to the inverter, thousands of Amperes of current can flow from the battery to the point of shorting and that section of the cable will become red-hot, the insulation will melt and the cable will ultimately break. This interruption of very high current will generate a hazardous, high temperature, high-energy arc with accompanying high-pressure wave that may cause fire, damage nearby objects and cause injury. To prevent occurrence of hazardous conditions under short circuit conditions, the fuse used in the battery circuit should limit the current (should be "Current Limiting Type"), blow in a very short time (should be Fast Blow Type) and at the same time, quench the arc in a safe manner. For this purpose, UL Class T fuse or equivalent should be used (As per UL Standard 248-15). This special purpose current limiting, very fast acting fuse will blow in less than 8 ms under short circuit conditions. Appropriate capacity of the above Class T fuse or equivalent should be installed within 7” of the battery Plus (+) Terminal (Please see Table 3.1 for fuse sizing). (source: Samlex EVO Inverter User Manual pdf)

DC 6-Way Fuse Block W/Negative Bus (Amazon)

Inlet size to cable size (VTE)

For 2400 watt 24V inverter recommends: 160 amp max inverter input, 200 amp fuse, 175 amp breaker, 2/0 wire size

ANL vs Class T fuses

Heavy Duty Battery Circuit Breaker 175 Amp 3/8 Studs 12V DC Automotive Marine (ebay $50)

ANL fuse holder for 4/0 (eBay $38)

Marine Rated Battery Fuse and MRBF Single Fuse Holder Kit (ebay 300A $26)