Enthusiast III
For that size, I would just get a new, large capacity controller.I only have the one 100w solar panels (4 - 25w'ers) with the 10a charge controller presently, and I am using two batteries and I have plenty of power for my camping rig. When at home I would like to use my system for some remote buildings I have that are powerless currently. I want to triple my solar panels to a 300w service. Should I add two more 10a charge controllers or one 20a charge controller, or should I just buy one 30a controller for the complete 300w system ? I would buy the solar panels separately, not as a kit, so they wouldn't come with controllers like my kit did. The new panels I will buy will be a single 100w panel unlike the kit solar system that has 4 - 25w panels. Can you give me any help here on this dilemma ? Any better ideas are welcome.
However, if you'd like to explore parallel arrays, this is a good read.