The other day I started to convert my system to 24 volt from 12. I thought I had all the possible kinks worked out (wrong) Everything even my outback flex 80 needed to be reconfigured. Panels connected to it however didn't, that's one area I was right about. what I had figured would be a 4 hour job ended up taking a day and a half. Good thing I had a portable Honda capable of running all night. I still have 10 75 watt shell panels to rewire but those are usually buried in snow so they normally wouldn't be supplying power in the winter anyways. I want to remove them from the roof and place them on a pole anyways so that can be done all at once. Is it worth all the trouble? At this point it is hard to say this time of years is bad for solar here. It looks like the batteries aren't getting drained as quickly but I haven't had much sun to see if they are getting charged any faster or slower. In the end I'll lose my 12 volt turbine (it didn't produce much anyways) I freed up one charge controller (Trace C40) to maybe do a dump load with or use at another location. Since all wiring had been installed figuring a 1% loss for 12 I figure I should be getting close to a near 0% loss now.