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Hi chris, I used solar gain for my PV system two yrs ago. They were very professional in their approach and did not charge for extras such as tile roof installation.
A couple of tips if I may, get a good inverter, it is the heart of the system and even 2-3% difference in efficiency can mean a lot in the long run.
Also, the size of the system makes a difference in payback time. I installed a 1.5kw system. I initially wanted a larger capacity inverter so I can expand later. The company actually talked me out of it! Basically get the inverter to match the system and don't upsize unless you really have to.
In terms of performance, I only just paid my first bill of $7.59, that's after I got a refund of $300 for the excess electricity the system fed back to the grid. All up I am very happy with my system and have recommended it to a few of my friends and colleagues (I am in no way associated with the company).
HTH, Bo
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