Adding breaker switches in to battery series

Evan B

Evan B

Bobber Downey Jr.
Staff member
Admin
OK help me out here. I have a 36v Minn Kota 112lb thrust. I power it with three 12v LifePO batteries in series. I use a three bank NoCo charger on them, and pull the connecting battery wires off each time I run the charger so that I'm charging each individually.

What I'd like to do is put a breaker switch in each series connection. So a total of two switches: (battery 1) - -? switch - - (battery 2) - -? switch - - (battery 3) - - 60a breaker switch - - Minn Kota

My question: the total Amp draw from the series to the minn kota is 60a. What capacity switch do I put between each battery? My reason for these extra switches is simply so I can break the connection for charging without undoing the cables each time. I just want to make sure whatever switch I add won't mess something up. I'm new to this type of in series battery thing so want to make sure I consider "you don't know what you don't know."

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Rather then circuit breakers on each battery install a single 60A DC rated breaker (40 VDC or better) on the positive feed to the minn kota. Put a battery disconnect on the positive terminal of each battery. Then you can easily isolate the batteries for charging and not have to deal with any coordination issues with individual breakers.

 
Dragon Mo said:
Rather then circuit breakers on each battery install a single 60A DC rated breaker (40 VDC or better) on the positive feed to the minn kota. Put a battery disconnect on the positive terminal of each battery. Then you can easily isolate the batteries for charging and not have to deal with any coordination issues with individual breakers.

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That particular one wouldn't work as my batteries don't have posts, but this one here may do the job. May give that a go.

 
Jaydub said:
With the batteries in series, you'll have same 60 amps in all three.
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Yeah, I just didn't know enough to know whether or not the amperage increased between each battery or what. But it makes sense now.

Do you see any reason those simple disconnect switches wouldn't be a good solution between the batteries?
 
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