Check out wholesalesolar.com, they sell panels by the palletload fairly cheap. Higher voltage house panels mostly. I'm wanting to run a 48v battery bank as well. The panels are mid to low 30v range, so you need a BOOST charge controller. Most are BUCK, as in they need panels with much higher voltage than the batteries. The MPT-7210 is a good example of a boost charge controller. But, it's only 10 amps, so you'd need one for each panel.
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