I've six solar panels
and run them in parallel. The first two I ordered had screw outstations for spade connectors. Using a 30W MPPT Demuda regulator, running an insulated cell with LED lights, 12V ceiling suckers, a 12V root pump, and a 12V refrigerator 2 times and no problems, preparing to add the 3rd panel. With two large deep cycle marine batteries and so far so good.