I bought this unit from another solar on-line store.rnrnWhen first wired up, it worked fine. However, I happened to disconnect the battery being charged, then reconnected it---positive lead first, then the negative lead. Smoke came out of it, and when I opened the box, an integrated circuit had melted down into a slag heap.rnrnIf you want to read more about this, here is a link:rnrnhttp://www.rv.net/forum/index.cfm/fuseaction/thread/tid/22807207.cfmrnrnI have since ordered a pwm type of controller from altE. I had a long discussion with Eric (who was very helpful) and decided to go with an ASC 12A shunt regulator. After having this bad experience with the Solar Converters MPPT unit, I was looking for something that was very rugged. I
ll have to see how this one works, but I advise against purchasing the PT 12/24-5A unit.

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