Hello,


I recently purchased a new RV and they provided me with two 12v 100Ah "deep cycle" batteries. I need more juice, so I am going to buy 2 6v (around 200-250Ah each) batteries. Can someone help show me how to connect them together to come out with 12v?

thanks
George

 

https://www.batterystuff.com/kb/articles/battery-articles/battery-bank-tutorial.html

 

Does this look right? (attachment)

 

Yep.

 

Does this look right? (attachment)

It will work for a while but it's also very likely the varying charging/discharging currents for the cells in each battery string during heavy loads will cause one or more batteries to be over and under charged due to internal resistance differences and interconnect resistances in the string of batteries.
It would be better if the physical charger connections (the + and - battery terminals )are separated by as much battery interconnect cable as possible to somewhat equalize resistance loops if your interconnects are not exactly the same length between strings. In your diagram the - charger terminal might be connected to the far - (-12vdc) terminal on the two 6 volt battery string and the charger + terminal on the +12vdc terminal of the far other side 12vdc battery string.

 

Does this look right? (attachment)

Yes that would work, it will charge your 6V cells in Series, or 12V cells in Parallel,,,

just make sure all cells have the same Ah capacity.

 

Thank you everyone... I'm going with my instincts here and installing all 6v rather than saving a few bucks with the 12v's the dealer gave me... It's a hybrid marine/regular batter, which I do not feel will hold up to a lot of cycles...

 

Thank you everyone... I'm going with my instincts here and installing all 6v rather than saving a few bucks with the 12v's the dealer gave me... It's a hybrid marine/regular batter, which I do not feel will hold up to a lot of cycles...

What is your reason for buying 6V batteries?
You would think that buying 12V batteries is the proper thing to do.

 

6v batteries connecting in series provide better current than the typical 12v. I'm sure others here can explain better than I....

 

6v batteries connecting in series provide better current than the typical 12v. I'm sure others here can explain better than I....

The main difference is battery construction not voltage. It's just typical that larger, heavier, bulkier traction type (golf cart batteries) batteries have fewer cells and hence lower voltage per battery unit. You even can buy individual cells for custom voltages.

http://www.forklift-battery-charger.com/forklift-charging.php