Solar panels are wired in series when you connect the positive terminal of one panel to the negative terminal of another. When solar panels are wired in series, the voltage of the panels adds together, but the amperage remains the same.
Advantages
Connecting your panels in series will increase the voltage level and keep the amperage the same. The reason why series connections are utilized with MPPT controllers is that MPPT Controllers actually are able to accept a higher voltage input, and still be able to charge your 12V or more batteries.
How To Do ?
Series wiring is when the voltage of a solar array is increased by wiring the positive of one solar module to the negative of another solar module. This is similar to installing batteries in a flashlight. As you slide the batteries into the flashlight tube the voltage increases.
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