Building or putting your own Solar system together is half the fun. Solar Kits are more or less, one size fits all.
On the controller side. This is a print out from "Morningstar"
PWM: Typically recommended for use in smaller systems where "boost benefits are minimal"
MPPT: 170w or higher to take advantage of the "boost" benefits more.
Well, that is what the folks at "MORNINGSTAR" have to say.
I have a 24v/100w panel on my e/scooter and use a 15a PWM china direct @ $16.99 (at the time) and WOW it keeps the batts right up there at around 25.2a even after a two hour ride in the sun. Can't beat that with a $500 controller. That's what I think to be the truth.
O$S