12V panel and controller to 48v
Hello all, I currently have 10 homemade panels and a unisolar 144watt and a charge controller running a 12v system, about 1 kilowatt total but only 1/3 hooked up now. I would like to buy a new battery bank and run at 48v. my panels put out about 21 volts max or so, and I am using a cheapo ebay controller to charge a 12v battery, with 12v loads. I have 2 good 48v inverters, and would like to move up to a 48v battery system so I can use the inverters, my question is how can I use the panels to charge the 48v battery? most of the charge controllers I see ( cheapo ebay )say they work best at 60v from the panels, others I have looked at are not specific. I was considering keeping the 12v side, and hooking up a step up boost regulator to charge the 48v from the 12v battery, which seems very inefficient. so, is there a 48v charge controller that can work with 21v panels? I am not excited about stringing the panels in series to up the voltage, not sure if that would be a good idea. I would be mostly interested in a charge controller I could just hook up to the 21 v panels, and charge the 48v battery, I thought MPPT chargers would step up if needed? thanks for helping this noob...:) any recommendations?
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