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byale292 avatar image
byale292 asked

Battery Fusing with DC DC Charger and MPPT

I've got a quick question regarding fusing when using both a DC DC charger and MPPT Controller I'm planning to set up a system in a camper to charge a LiFEPO4 battery from both a DC DC charger (Orion-Tr Smart 12/12-18 isolated) and a SmartSolar MPPT (100/20). The DC DC charger specifies 60A fuses on both batteries which I have purchased and installed (battery post mount style). But, the MPPT controller manual specifies a max fuse of 30A.... Am I good using just the 60A battery post fuse, or should I add an additional 30A inline fuse between the MPPT and battery? Planning to use 8AWG stranded copper everywhere.


Thanks!

MPPT Controllersorion dc-dcfuses
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1 Answer
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kevgermany answered ·

Best to fuse the units as per the manual.

However, the fuses are there to protect the cabling, so if the MPPT cables to the battery can handle 60A safely, you could skip the extra fuse.

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