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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127
Posted: 06:23am 17 Feb 2009
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The economics of a 10kW 1phase, or 30kW 3phase PV grid connected solar RE farm seems pretty good. The banks are giving poor returns on investment and the stock market is not real good at the moment. I would expect that 10-20% return might be expected, in SAus anyway, with up to 64c/kWhr paid.
Are there readers who have considered more than the 1kW rebated system?
Gordon.become more energy aware
petanque don Senior Member Joined: 02/08/2006 Location: AustraliaPosts: 212
Posted: 12:58am 20 Feb 2009
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When the small system with a subsidy doesn’t make economic sense.
It seems unlikely that a larger system would make sense.
While discounting rates are an individual thing.
Myself if I had the option of spending $100,000 over the next few years and getting the enjoyment from this consumption now this seems more desirable than spending all the money now and getting a few hundred dollars to spend for the next 50 years.
How you value the warm fuzzy feeling from being kind to the environment compared the enjoyment of consumption would be a personal thing.
While interest rates may be very low at present it is pessimistic to thing the global economic crisis will last for the next 50 years.
What will be the average interest rate for the next 25 to 50 years I would not know but it probably will be higher than at present.
Sensibly if solar towers or geothermal electricity become commercial they may provide a better return.
Presently wind farms give a better return providing you have a good site.
GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127
Posted: 10:44am 20 Feb 2009
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Hi Don,
I cannot say I based my calcs on a warm fuzzy feeling.
My modest system, produces approx $1200 of power that I use in my house, that I do not have to pay a utility to supply, and in addition provides me with $1200 cash for the power that I sell per year. To portray that if you spend $100,000 and only get a few hundred dollars to spend for the effort is just a lie.
Gordon.become more energy aware
RevUpWind Regular Member Joined: 03/05/2008 Location: AustraliaPosts: 60
Posted: 03:42am 21 Feb 2009
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Coming week will have a 2.7Kw system with 10x 170watt Schott panels. Inverter is a Fronius IG30 and hope to also feed our 2x dual stator windmills through it.
Have the $8000 grant and matched that to get to the 10 panels which on figures should supply close to 70% of our needs. It is all looking viable with maybe just a bit of a warm fuzzy feeling.
Does anyone have some thoughts on what type of controller is best to use to feed into this inverter? MPP voltage input is 150-400 V with a max of 500V. Read on the forum thread on capacitors someone feeding as low as 54 V to the inverter in a grid feed system.
Wind & Sun, freely given and thankfully used. PeterEdited by RevUpWind 2009-02-22....River Heads - Australia
The wind blows wherever it wishes; you hear the sound it makes, but you do not know where it comes from or where it is going.
GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127
Posted: 04:00am 21 Feb 2009
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Re para 1. 10 x 170W panels = 1700W. Maybe you mean the inverter is 2.7kW
Good luck with a high voltage controller. This cannot be ON/OFF type control and must be fast response or the inverter wil fry. No point in saying MPP voltage, as this relates to a solar installation.
Gordon.become more energy aware
AMUN-RA Senior Member Joined: 10/03/2007 Location: AustraliaPosts: 144
Posted: 09:12am 21 Feb 2009
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Your in queensland so you cannot feed the wind into the grid if on the solar bonus scheme it only pays for solar generated power.
Ig 30 is designed for solar, if the grid goes down where does the power from the mills go think I can smell smoke??
Mick.Every day the sun shines
& gravity sucks= free energy.
RevUpWind Regular Member Joined: 03/05/2008 Location: AustraliaPosts: 60
Posted: 04:47am 23 Feb 2009
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Mick, it was an idea and too much of a fiddle to make it work. And of course as you say the IG30 is only for solar and had no idea you cannot even do it legally. Am happy to run my shed, tools etc. on the mill, so still a happy little vegemite Peter....River Heads - Australia
The wind blows wherever it wishes; you hear the sound it makes, but you do not know where it comes from or where it is going.
Trev Guru Joined: 15/07/2006 Location: AustraliaPosts: 639
Posted: 10:29am 26 Feb 2009
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Gordon,
I have not considered the economics of such a large system.
What's your thoughts?? Whats your numbers???
Trev @ drivebynature.com
GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127
Posted: 10:34pm 26 Feb 2009
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Hi trev,
You can get solar systems in container quantity for $4200/kW. I have estimated approx 20% return on investment. Much better than the bank, or even the stock market.
I have just started researching the idea of a solar farm and it looks promising. Would be interested to know if anyone else has done the same thing in the Adelaide hills area
petanque don Senior Member Joined: 02/08/2006 Location: AustraliaPosts: 212
Posted: 01:06am 01 Jun 2009
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At the present time people are offering 4% for bank style investments. So $100,000 will give a return of $4,000 if you just do nothing. Averaged over the next 20 years (payback for a solar system) interest rate are likely to be more.
While I don’t know how unreliable solar systems are there is some chance something will go wrong.
Such as struck by lightning or earthquakes for instance.
So you should get some premium for this risk.
Is the $4200 per Kw system installed?
GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127
Posted: 07:16am 04 Jun 2009
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This was for the container of bits, including panels, framing, cabling and connections and inverters. Land not included, or labour.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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