We’ve switched our RV over to Lithium by Battle Born and haven’t looked back since. The amount of power those batteries can accept and can put out, combined with a 10 year warranty and the fact that you can discharge them down to 10% makes them the best game in town in our opinion. Yes they are more money, but since you can use all of the battery capacity, not just half like with AGM or Lead Acid (your not support to discharge them below 50%), the lithium really isn’t that much more expensive. Factoring in the warranty, it’s probably actually not more expensive. As for voltage, it’s tough to beat a 12v system in an RV. Thats because your lights and all of the other 12v systems like your generator starter all run on 12v. If you move to a 24 or 48 volt system you need step down converters and things get complicated fast. That is why we recommend 12v for any RV setup. For homes, a 48v bank is definitely the way to go. You can add about 4x the amount of wattage in panels for each solar controller so its a no brainer to run a 48v bank since everything in a home runs off 110v anyway. Hope that answers your question. We are a Battle Born dealer so if you need anything just let us know!

Hi Jim, probably best to separate the inverter topic from the solar topic when thinking about this. That will help you visualize and the systems are generally not connected together other than they both pull or feed the battery banks. For solar, you just need to connect your solar panels to your charge controller and your charge controller to your house batteries. Don’t over complicate that side of things but also make sure to follow the instructions and wire sizing guides provided by the manufacturers. For the inverter side, its a bit more complicated as it depends on whether your inverter has an AC Input (not output, an AC INPUT) and a built in transfer switch to switch between inverted power and shore power. This is where things get more complicated and where i recommend you talk to an electrician to help. That said, here is a diagram that will give you an idea of what i’m talking about to get you started on a design: https://d3f7dpm96o8eu9.cloudfront.net/media/wysiwyg/sysparts.gif

Hey Jim, you dont need a transfer switch, those are only when you’re messing with the AC side of the electricity and dealing with multiple AC inputs like shore power/generator switching. Assuming your rv came with a generator that should all be installed already. If not, the folks installing your generator will install one. For the solar, you look like you have the basics for a setup although i’m not certain if 300watts of solar will be enough. All you’ll need to do is wire up the panels to the charge controller in accordance with the instructions and then connect the charge controller to the 12v house battery in accordance to the instructions. I’m over simplifying things but essentially since the panels run on 12v and your charge controller runs on 12v you can hook the solar controller right up to your house batteries just like you would any other battery charger. This would be completely independent of the inverter/110v side of things. If your also installing the inverter above, I recommend you defiantly consult an electrician and get a full wire diagram map before you get started. They will need to inspect your electrical panel and existing wiring to make recommendations. Always best to be safe when dealing with power and consult an expert.