I have a C-30 controler on a system that was installed on my house. This system was never made operable by the contractor that installed it. The contractor went out of business and left me with no other solutions that I was aware of. Since the neighbors children have broken the solar panels with rocks and the controler has not been used. I would like to see if you have an offer to purchase this controler. No reasonable offers will be refused. If this interests you please email me at firstname.lastname@example.org Thank You!