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I have a solar installation, but in SA there is no Gross Feed in tariff so it is only the power I generate over and above what the household uses that gets fed back to the grid @ $0.60p/Kw. This equates to around $20 per month. The power that the household consumes from the panels rather than the grid has reduced my electricity bill by around $200 - $250 per quarter (including the $20.00 from the surplus fedin)
My understanding is that with a Gross feed in Tariff all the power that a PV installation generates is fed to the grid and you get a rebate annually paid for the full amount.
You continue to purchase electricity normally throughout the year, but the rebate you get back would offset this cost.
If it is just the RECS that the installers are keeping to give you a $0 system, I would go for it. It seems a lot of trouble to try and sell them yourself.
If its the RECS and the Feed in tarif that they are keeping, I would consider purchasing for $3K. You will eventually get the outlay back and then be in front.
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