本帖最后由 pandaengineer 于 2012-3-30 13:57 编辑
kelvinb 发表于 2012-3-29 22:33
hope you don't mind me asking roughly how much you paid for the whole system?
i am getting Sunt ...
$9000 The Xantrex inverter is one of the best, if not the best inverter on the market. I got a big system (16 panels... but I've seen people who get 30 panels...) because I wanted to get money when I get my electricity bill. (Which is what happened last quarter, I got $55 CR instead of having to pay $400...)
Using conservative figures (worst case): Also with the introduction of the carbon tax having a larger system will help save heaps even faster. · Assume on shady days panel generates nothing, when in reality it still generates something. · Assume efficiency is 80% (but in reality 95%+) · Annual Sunny days in QLD = 236 days · With the tariff (*) if you install a 1.5kW system you will be covering some of your own use (saving $0.20/kWh) other times you will be generating (making $0.50) so use $0.30
With a 3kW system you will be covering you own use and generating more of the time to supply the network so use $0.40
Cost Benefit analysis(Pay Back) | | | | | | | | | | | | | | | | | | | | | | | | | kW system | Hours the panel is generating | Efficiency | Sunny Days | kWh | *Tariff pay to gen $ per kWh | Annual Benefit | Benefit per month | Cost of System | Pay back Years (Not factoring in Costs if you have a home loan) | Cost (Additional Interest Charged) a month | net gains a month | Real Pay back (Years) | 1.5 | 7 | 0.8 | 236 | 1982.4 | $0.30 | $594.72 | $49.56 | $2,500.00 | 4.20 | $14.61 | $34.95 | 5.96 | 3 | 7 | 0.8 | 236 | 3964.8 | $0.40 | $1,585.92 | $132.16 | $9,300.00 | 5.86 | $54.35 | $77.81 | 9.96 |
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