The master plan,
What type of heating were you planning on providing with these panels? Being 1980's-era tech, they might be rather low in efficiency. Considering your Northern latitude, you would need more than 6 to provide lots of useful hot water, especially in winter.
Solar PV, heat pumps, budget billing and net-metering go hand in hand. Before this decade, thermal solar combined with a massive heat store made better economic sense. But hardware prices have been falling fast, and continue to fall as we speak. With small-scale systems, the installation price is now more of a factor than the hardware. If you can DIY, the savings will allow you to add more panels.
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