Gulch wrote: »
I have a spare Sunforce (they may be junk too, for all I know) 30 amp controller... The specs on it say 25Vmax input... these panels seem to occasionally hit 27 V under load a few times a day, usually only for a few moments at a time... and this during winter... I wonder if that would fry the controller?
One thing I don't quite understand about the controllers: Is the amperage rating on a Xantrex C60 CC only for output, or is it for input also? Will the occasional 70 A surge fry it, or not?
And in the same vein: I wouldn't mind (much) spending the money to buy a 'real' MPPT charger for the little RV system, but I can't find a moderately priced one that will handle 425 or so watts on 25V+ input and 12V output... I COULD cut down to one panel, and use the Morningstar 15A MPPT controller, but that would be borderline for running my furnace blower on a couple of consecutive cold and cloudy days.
I can move your posts to its own thread if you want to continue the discussion along your needs.
telljf wrote: »
it will show that it will regularly break the sum of open circuit peak current limit of the panels.