From the attached image, you have what looks to be an SAE solar plug, a DC connector. This is most likely connected to your battery bank, I suggest you trace the wires.
If this does not go through a charge controller, you will need to have one in addition to the solar panels. I recommend the 200 Watt Go Power Portable Solar Panel with Digital Solar Controller, # 34282610. This portable solar charging system lets you place the solar panel where you need it for maximum sunlight. The... view full answer...
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