When I built my trailer I thought serious on what type of charging system I wanted. I know I wanted a on-board charge so I have a NOCO 10amp on-board charger, solar was another one, so I went this Renogy. My solar system is 2 100watt portable suit case panels. 15ft of 10awg cable, branch connectors, 30amp Renogy Charge Controller, 125ah AGM VMax battery.
I run a single 125ah AGM VMax battery on solar or 110 to 12v. converter box. On solar I have mine set up for running 2 100watt portable suit case panels in parallel or I can run one 100 watt suit case panel depending on how much 12v. gear I want to use. The 110 to 12v. converter box I can run a small generator if the days are over-cast\cloudy or camping under heavy foliage trees to charge my battery. I've never had any issue charging my battery on either system They provide a fully charged battery with a reserve for night time use .
I currently started another trailer project squaredrop trailer & will be using the exact same set-up as my current trailer has.
One thing I found is that every one has different set-up, they all work, it's all about what works for you
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