First things first, if adding batteries they should be less than 12 months in age difference and have similar resting charged voltages. There should be a little spark when you make the final connection to your RV. This is typically devices in your RV that are using small amount of current. The bigger the load, the bigger the spark. When connecting your batteries together there are a few rules to follow:
Remove conductive jewelry.
Insulate tools with electrical tape or other solutions.
All cables must be same length and diameter when in parallel.
All series cables must be same ga (thickness).
Biggest draw cables need to be closest to the connection, battery or terminal.
No more than 4 lugs on any terminal.
If you add capacity or loads you may need to replace wires to inverter and 12v load center.
All wires can only be on either end of battery bank, so that your not drawing from one battery more than an other and in some occasions the wrong voltage!
Well let’s look at many different solutions to how your battery bank might look like.
