bpounds wrote:
You're missing an opportunity if you run all 4 panels in parallel. With 4 you will yield a little better if you run 2S x 2P. Your MPPT controller can take better advantage of the higher voltage in all light conditions. You can also downsize some wiring if you choose. No point in having an MPPT if you run them all parallel. No need for any extra breakers IMO, just one to protect, and more importantly to disconnect, the entire array.
I'm not really understanding what the advantage to running in series over parallel is, or running a parallel-series. Well, other than being able to downsize wiring, and presumably a bit easier install. Really the only reason I want to go parallel is for better partial shade performance... Assuming that I am understanding that correctly.