Fuse and DC cables for MultiPlus 12/3000

Fuse and DC cables for MultiPlus 12/3000

The normal fuse you would install with the 12 volt MultiPlus 12/3000 is at least 350 Amps.  This is because it has a surge capability and because as the battery voltage varies so does the current.  A 350 amp fuse will avoid nuisance tripping caused by surges. Your cables should be sized for 350 Amps since the primary purpose of the fuse is to protect the cables.  From the Ampacity Tables 2/0 cable is good for 330 Amps if you are using marine grade cable, and you are allowed to round it off to the next highest fuse size which is 350.  In the instruction manual they recommend a 400 amp fuse and if you do that you would have to use 4/0 cable

In many cases the voltage drop tables will give you a larger wire size.  2/0 is the minimum wire size for this inverter charger but if you read the instruction manual they talk about the subject and if there is any distance between the battery and the inverter charger you should double up the cables. (ie doubled up 2/0 for both the positive and negative - the inverter has provision to attach two cables)  If you double up the cables you can do two 200 Amp fuses and use smaller cables.

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