Battery wiring

[TKE459]

I'm looking at installing the blue sea add a battery, acr, and on board charger. I've tried searching the forums and my question pertains to the wire lug size. Is there a standard size to use that is one size fits all or do I need a specific size for each wire end depending on what it is connecting to?

Also, are 150amp breakers the standard to use between the batteries and the switch?


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[zabooda]

Your breakers are determined by your load and they are to protect your equipment including wiring. A 150 amp breaker will require size 1 copper wiring so you will need some large lugs probably with the set screws.

http://cerrowire.com/ampacity-charts

[MLA]

do I need a specific size for each wire end depending on what it is connecting to?

Yes. An over sized on a small stud is not as good a connection inductively. If the ACR is mounted close to the switch, those breakers are not needed, just fuse the ACR's ground wire.

[TKE459]

Yes. An over sized on a small stud is not as good a connection inductively. If the ACR is mounted close to the switch, those breakers are not needed, just fuse the ACR's ground wire.

MLA, I plan on putting the ACR as close to the switch as possible. Just far apart enough to run the wire from the ACR to the switch.


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[MLA]

MLA, I plan on putting the ACR as close to the switch as possible. Just far apart enough to run the wire from the ACR to the switch.


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Then I see no need for those breakers as theres almost no chance of a short to ground in that short of a run. Also, if you fallow the schematic, you will likely have batt+ on both sides of the breakers almost all the time. At this point, the breaker does little to nothing.