N-Type 16BB 200W Bifacial Solar Panel, 200 Watt Solar Panel for 12V Battery Systems, 25% High Efficiency, Dual-Module Parallel Anti-Shade Design, for RV Van Marine Home Rooftop Off-Grid

You start by deciding how many batteries you need, once you determine that, then you can watch YouTube videos were solar panels are compared. I personally use use this panel. https://a.co/d/0h4TAv2H Amazon just had a sale, so I picked up a portable panel as well. https://a.co/d/02RdNhD5 I have been using both since Sunday, it speeds up charging battery. The portable panel comes with everything but a battery, works well, the solar controller that comes with portable panel is cheap but works. Again I have both panels and both solar controllers hooked to my one battery, and they work well together and stop charging once battery is fully charged, at that point I disconnect the portable panel and put it up, let my regular panels float charge battery the rest of the day. I use about 600 watts a night, sun doesn't really hit my main solar panel til around 1 pm. So the boost from the portable panel is welcome.