Having designed and installed my own 4.4kW grid-tied system, you're going to be hard pressed to find any companies willing to spend the time to create a free design for an off-grid system. I had a challenge finding a structural engineer willing to design a roof mount system capable of withstanding a 3-second gust of 170mph!
I'd second pinball's recommendation of enphase microinverters for grid-tie, if you decide to go that route. I'm looking forward to building another system with them...
You indicate you have a 2hp well pump, have you looked at converting that to a DC motor?
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