Does that take into account the BMS, bus bars, some sort of case, time and effort building, balancing, testing, etc.?It was gonna be a 206ah SOK but I found I could get that extra 74ah for $300 less.
400W mounted flat on the roof may give you 360W for 5 hours on a perfect early summer day for about 1800Wh. That's about 50% of your 12.8V 280Ah battery (3584Wh). Most of the year you'll get less out of the panels. Driving or shore power could allow for extra charging when needed.but will the 400w of panels suffice?
400W / 12V = 33A of possible charge current. Though 360W at 13.5V = 27A. So a 100/30 would let you take full advantage of the 2 200W panels. If you add two more panels you would need 60A of charge current. That could be done by adding a 2nd 100/30 or upgrading to a 60A charge controller. Buying a 100/50 now would let you add a 3rd panel. You could add a 4th panel to a 100/50 but you wouldn't be able to make use of the full 800W. At best it would handle about 675W. And that's not actually too bad since you would rarely get much more than 675W out of the flat mounted panels much of the year.If I wire the panels in series, the amperage should still be 9.8A correct? Will the 100/15 suffice? 100/20? 100/30? Or should I just get the 100/50 in case I want to add a panel or 2? (down the road it's possible I remove the system to reinstall on another van, bus, or for a homestead, which may require a larger system, therefore a larger controller). Thoughts and suggestions?