Hi.
I am working out similar details, but have taken a more modular approach.
I used a free spreadsheet I downloaded off explorist.com. Mostly because it is constructed in the way that I think. So it seemed natural for me to use.
More importantly, I liked that it separated out loads into two categories 120 V, 12 V, and stuff that uses a power supply off 120V.
And then within each of those categories, a hierarchy of hi consumption devices, and low consumption devices.
I guess another way to say that would be big important stuff, nice to have stuff, and unimportant stuff.
And then each device has a column for an estimated number of minutes used per day.
That spreadsheet is big enough that I was able to play games with my consumption figures, to better optimize the size of my array, the watthours I would need to potentially generate, and then the size of the battery storage that I would need to meet my performance goals.
needless to say, modeling, and imagining behavior, before you spend a whole lot of money, can be eye-opening but also fun.
But I also recognize not everybody thinks the way that I do, nor enjoys the same kinds of things I do.
I hooked up a shunted meter and started turning things on and pulling out fuses. The numbers I generated were bang on from the manufacturers literature. So I have confidence in my figures.
In a nutshell, keeping a camper warm enough in low temperatures is a problem.
The only reason I mentioned using that other spreadsheet, was because it really helped me having things blocked out into groups.
I hope it’s not a sin on this site to mention some thing that works really good.
