Howdy Clark, I took the all electric approach with my coach. IMO, the stage that you are at is the most difficult due to all of the unknowns. Obviously, the draw of various appliances and the amount of time that they will be in use is difficult to estimate. Toss in solar panel efficiency (due to mounting/dirt), insolation at your current location, and inverter losses and the whole equation is messy. As an engineer - it nearly drove me insane and I had the advantage of having lived in a motorhome for a while.
IMO, about the best you can do is make some educated guesses. Observe your current style of living over a week or two and take some notes. How many minutes did you use the microwave, the cooktop, the oven, lights, television, etc... Hopefully that gives you some "in use" numbers to work with.
Next, the energy number published with appliances appears to be a useful number, IMO. Using only my refrigerator as an example, the documented number is fairly close.
After several years of use, I can say with confidence that my flat mounted solar panels produce about 80% of rated power during the summer months and slightly less than 60% during winter months (in the desert southwest). You will have to factor that in as well as where you plan to spend most of your time (insolation level).
Judging from the handful of PSW inverters that I've looked at, none are more than 90% efficient. So, assume a 10% conversion loss (at least). This is why many here wisely advise powering as many items as possible from DC (rather than suffer the big loss).
With a bunch of data in hand, you start putting an energy budget together. I did that
here for my Dutch Star. I've done several for my coach but I've never published any of them as there are just so many variables.
If you goal is to run an solar as much as possible, I'd suggest putting as much solar on the roof as you can fit. It is very unlikely that it will be excessive. Yes, there are several rules of thumb and design criteria that are best practice. However; it is nearly impossible to achieve these with a bus/rv/motorhome.
IMO, lithium is easily the best technical decision for a battery bank. They are incredible and make everything else easier. However; the short-term cost is high. Long term?? More of my opinion, but I believe they are no more expensive than a FLA bank. However; that is debatable since there are so many factors at play. Some like to argue about it but it really isn't worth the time. Do your homework, establish your mission criteria, and do the math. That said, any of the common battery types will serve you well (at least in a 'typical' sized RV bank) if you care for it properly (more homework).
This the fun part of designing a system.
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