I have an inadequate solar array to charge my 650 amp hour 48 volt battery bank. I currently have 4 x 110 watt 12 nominal volt evergreen pv's strung in series. I was thinking of either adding 8 to twelve more similar panels using the same blue sky 3048 mppt controller or purchasing 9 more 18 nominal volt panels and stringing them in 3 series of 3 panels and using an additional controller. The cost is very similar due to the larger panels being about the price as the lower voltage panels. The larger voltage 3 panel strings would end up being 80 vmp and the older 4 panel strings were 68.8. The panels sit on the roof housing the batteries and charge controller so distance is not very far. Any input would be appreciated.
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