Be sure to connect everything using the same polarity red to red and black to black.
How to connect two batteries to a solar panel.
To wire two or more solar panels and batteries in parallel simply connect the positive terminal of solar panel or battery to the positive terminal of solar panel or battery and vise versa respectively as shown in the fig below.
The series connection of two identical batteries allows to get twice the rated voltage of the individual batteries keeping the same capacity.
Here are a few of the terms that are important to know when solar charging two battery banks.
If both panels are rated at the same maximum voltage then you ll get maximum output.
To power a dual battery system you ll need to connect the panels in parallel.
Always connect the rv house battery bank to the first battery position as it will receive the full charge before the second battery begins to charge.
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Solar charge controller keeps the solar panel from over charging your battery or batteries.
With the black battery cable connect the black negative terminla of battery 1 to the black negative terminal of battery 2.
Following this example where there are two 12v 200ah batteries connected in series we will have a total voltage of 24v volts and an unchanged capacity of 200ah ampere hour.