377 Battery Box

[peoples1234]

I have perhaps an ignorant question that hopefully someone can help with. My 377 came with a single group 27 battery, and I am going to add three more for a total of 4. I have attached a picture of my battery box/connections.

My question is that there are two red wires and two black going to the one battery. On the wall are two boxes that each have a positive wire going to it.

Okay so the question, do I wire the banks in groups of two and tie those one box and then the other two to the other box? So two batteries per box, or do I connect all 4 together in parallel. I assume that somewhere they converge into one single 12V source, but I’m not sure.

[Stingray75]

Connect the batteries in parallel - Tie the positives together and the negatives together. Connect the coach positive to the positive on the first battery in the bank and the negative to the last battery in the bank.

[pconroy]

Originally Posted by peoples1234

a single group 27 battery


all 4 together in parallel.



I assume that somewhere they converge into one single 12V source, but I’m not sure.

That single group 27 is 12V.
Assuming you buy three more 12V Group 27's then you *have* to wire them in parallel.


Wiring them in series will give you 48V which will probably make your converter very unhappy.

[prm99v6]

Here are some configurations.


https://www.usbattery.com/info-center/configuration/