Solar Boost 50 (now Blue Sky) MPPT Charge Controller - 50 amp - 12/24 volt - with digital display, unused in original packaging - (PRICE REDUCED) - $100. Blue Sky is currently selling similar models w/digital display for $400+.
Bought this for a project that never got off of the ground. The company (RV Power Products > now Blue Sky) is known for building high quality products. This item been stored in a cool, dry place for many years. I guarantee it to be in working condition upon installation. I recently sold a Trace SW4024 inverter bought at the same time, and the buyers said it's performing it's job well.