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Has anyone done a teardown of what is in this thing? Is there a built in charge controller/inverter? Would making a DIY like this cost the same as much as google is asking ($60)

Hello, I'd like a battery recommendation for my current simple setup: Mega 100 Watt Portable Solar Panel from RichSolar Renology wanderer charge controller Use: charging a 26k amp hour powerbank over several days I wont need an inverter because of the charge controller's built in USB ports...

I specifically requested the white one but they sent me the black one. Does anyone know of any major efficiency loss from the colors? I know white reflects heat while black absorbs it and heat has an effect on efficiency. Should I bother with an RMA? The panel...