Need help choosing a solar controller

StewB wrote:
Not knowing much of anything about how to wire this up, I assumed -
Each pos and neg off of each panel to a post on the back of the mounting frame with 10 gauge wire.

Then an 8 gauge pos and neg run about 15 ft to the controller mounted inside the cabin.

Then an 8 gauge 16 ft run to the batteries.

4 100 amp 12V Batteries wired in parallel with 4awg cable to posts (neg off last battery pos of first)

Hi SteveB If you go with PWM your wire size is to small assuming 15 and 16 foot numbers were one way. Well the run from the panels are under 3% but the run to the battery will loose about .40 of a volt. While that sounds small it isn't. FLA batteries need to gas a bit. A stationary battery will stratify. Heavy amounts of the asid down low causing grid corrosion and light levels of asid up high causing freezing issues and sulfation. The number one cause of battery failure in stationary solar charged batteries is sulfation. About 80% in fact.

I would suggest a solar controller that has adjustable bulk and float settings and set them to your battery manufacturer specs.

I would move the controller close to the batteries (within a few feet) And use at least #4 cable the 30 feet to the panels (remember the round trip is 60 feet) good luck!