Greetings, new guy here. I have a dual battery setup and looking for solar panel recommendations. I'm using the Redarc 1225d 25a and it has a built in solar panel controller. Manual say 'must use with unregulated panel', but being new to solar I have zero idea who manufactures solar panels, let alone 'unregulated'. So kick me in the right direction to start the research and buying please. Thanks in advance!