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garytoh Posted - 10/12/2009 : 11:57:09
I've got a electric bike with a 24 volt system which is powered by two 12v deep cycle RV/marine batteries.
Obviously they're wired appropriately.
My question is can I add a 3rd battery to the mix by simply hooking it up to one of the original two?
Common sense tells me to hook it to one battery - positive to positive and negative to negative - thereby making the two of them the same as one ex-large 12v battery.Exactly how would the connection be made?

Thanks in advance...

Gary Toh
7   L A T E S T    R E P L I E S    (Newest First)
Talos Posted - 01/01/2014 : 15:59:28
Gary. The only way you can hook up a 3rd battery is to connect the two existing 12 batteries in parallel, which will double their 12v capacity. Then you can connect a 3rd battery which must have the same capacity as the increased capacity of the two in parallel.
In other words, you create the equivalent of two 12v batteries having the same capacity as the 3rd battery. Connect the equivalent pair in series with the 3rd battery.

I must ask; why are we discussing battery powered vehicles in the IHPVA forum?
jackiemach Posted - 12/31/2013 : 03:10:39
I think, Before add 3 battery, You will contact with any expert. He will give better suggestion on it.

jael Posted - 09/13/2013 : 02:25:24
Hello, I see no problem if you will add 3 battery as long as the volt will be balance with each other.
Nvradtec Posted - 09/10/2013 : 23:05:04
The 3 battery scenario can work (2 parallel, 1 in series) however you would then have a discharge imbalance, your best bet is the 4 battery setup (2 each in series then parallel the 2 24 volt banks)better discharge characteristics
bigbody Posted - 04/25/2012 : 06:13:29
hi i am ron for your question i think than you can add many battery that you wont but the problem is the conection you need to read how to coenect the batteries in some manual or you can contact a electrical technician for this :)

Don S Posted - 10/15/2009 : 20:01:33

You can add more batteries and maintain the voltage but from what I've read you will want to keep the amperage even on both battery packs. ie. 4 batteries may be a better solution than 3.

You can make up your own connections to the battery terminal. End terminal connects to 2 way terminal, etc.

Good luck with the project.


Designer/builder Spectre and Specter II.

"it's important to understand what makes them fast. It's more important to understand what keeps them from going faster." DS
dsbente Posted - 10/14/2009 : 01:33:04
i far as i can see it is quite impossible...
same charge will be connected to the other same charge...
hmmm.. maybe that won't work....

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