Makai has carried 4 Kyrocea 120's @ 12v into a 680amp house bank for the last 3 years. We use the SB50 MPPT
controller. I orginally wired mine parrallel and mounted the panels length wise to the centerline. the area of wiring I went several sizes over the recommended sizes. I had planned on adding more panels in the future and to reduce the current
drop due to the extended length of the cabling. This setup work superably, but i believe it can be improved.
Shading wasn't much of an issue. Usually at anchor
I would just move the boom to reduce the shading on the panels. We are an electrically intensive users and found that we would have the bank fully charged by 10ish in the morning. For the most part shading was only an issue under sail, but would usually have half of the panels completed unshaded.
Planned changes. Replace the panels with the latest and greatest output for the space when getting ready to head
out again. Mount the panels lengthwise parrallel with the centerline. Move 2 of the 120's to the anchor/sail locker hatches (plenty of room on the hatch) with a goal of 1000 watts or more.
I really recommend with max'ing the amount of solar
and using oversized cabling. We found that if we had more we would use it and it just made life more pleasurable when out there.