Posted by JerseyBoy on July 30, 2005, 6:14 pm
I'm installing a 7.3Kw rooftop system on-grid. I live in central New
Jersey. Can anyone give me an expected annual output?
Any tips on installation?
Posted by darthpup on July 30, 2005, 6:23 pm
15000 kWh per year good for $500.00 per year. Payout in 25 years.
Posted by Anthony Matonak on July 30, 2005, 7:23 pm
You could try the Nrel PVWATTS calculator.
I tried it for Newark and it gave me 8636 kwh a year at
a value of $24.
Posted by JerseyBoy on August 1, 2005, 4:21 pm
Thanks, I live closer to Philadelphia, so I used its latitude. Using the
calculator, I came up with 9117 kwH of output, which is about 60% of my
current usage. Retail price is currently running $.13 per kwH. I consumed
15227 kwH in the past 12 months, costing me approximately $979. It looks
like I can save $185 before using my REC credits which I'm told is worth
$134 per year. (Can someone confirm whether the REC credits are
non-taxable?) That's $319 per year, or a yearly profit of $40.
My system will cost $7,211 after state incentives. Without considering
future value or inflation, it sounds like payback is 7.4 years.
I didn't include the cost of income taxes required to earn that $185...
Any comments on the Sunny Boy 6000U inverter and Kyocera KC187G panels?
Posted by darthpup on August 1, 2005, 5:08 pm
In a payout analysis it is a basic requirement that you calculate the
cost of the capital invested and then divide that by the percent of
usage of the system.
As usage goes down the capital cost goes up. You may be considering
paying for the system in cash, however, your overall investment needs
to be considered in line with current investment costs typically in
percent on the dollar. I would suggest you do a web search for a
payout analysis algorithm and then recompute.