I have a van with 2 100 watt solar panels that I modeled off of will prowse’s small 12 volt system. When I first put it together it worked great all summer when I just had it hooked to one panel. I just unhooked everything and moved it all to a more secure spot in my van and hooked up a second solar panel. I have not been able to get a full charge on my 100 ah battle born lithium battery. I cleaned my panels and parked my van in the full sun(I live in Texas) my remote meter keeps reading that it is nighttime and won’t charge. I don’t see any loose wires or anything. What could be wrong?