We have an 11 year old 5kw system that had two 2.5kw SMA Inverters. One of them failed so we got a new SMA 5kw inverter, but now we still have an unused 2.5kw inverter, even though it is 11 years old it still works. Also, in the two weeks the inverter has been working it only gets as high as 4kw. Our current panel array is on the hill behind the house.
I would like to add more solar panels on the house roof. I could either add 2.5kw of panels for the older inverter, or add 1kw of panels to bring the 5kw inverter up to capacity. It has the ability to wire in two solar arrays so I could still use the excess capacity of the new 5kw inverter.
What are your recommendations? The hill points SE so I could have the rooftop array point SW and therefore maximize daily production.
Any help is appreciated. Also, where can I find the best value in buying solar panels?
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