Edited by Dr_Pat, 25 January 2011 - 12:24 AM.
Solar Water Heating With Black Poly
#21
Posted 25 January 2011 - 12:21 AM
#22
Posted 25 January 2011 - 04:44 PM
Edited by MilkyJoe, 25 January 2011 - 04:46 PM.
#23
Posted 25 January 2011 - 06:52 PM
#24
Posted 02 June 2011 - 12:16 AM
http://www.davey.com..._Gas_Heater.pdf
http://www.directpoo...au/prod1290.htm
Edited by Riggertron, 02 June 2011 - 12:20 AM.
#25
Posted 02 June 2011 - 12:28 AM
http://www.ebay.com....=item19c5a6e8d1
#26
Posted 02 June 2011 - 03:10 AM
i have a 10000L pump. It draws 190W, so about $0.86 per day assuming its on 24/7
Edited by Niz, 02 June 2011 - 03:12 AM.
#27
Posted 02 June 2011 - 07:51 PM
#28
Posted 02 June 2011 - 11:24 PM
#29
Posted 03 June 2011 - 06:17 AM
#30
Posted 04 June 2011 - 05:33 PM
#31
Posted 04 June 2011 - 07:38 PM
#32
Posted 04 June 2011 - 08:38 PM
1) If you get in quick you will still get the 40c rebate if you are lucky
2) If you arent quick and get the 20c you also add the feed-in tariff of 7c, so you get 27c for every kw you send out.
3) You pay 21c per kw, so you are still infront.
4) If you send out to the grid you dont have to pay for storage and maintenance.
5) If you store power, you will end up with less, there is always going to be a loss when you store power.
6) Grid feed inverters have the highest efficiencies you can get on inverters, getting up to 97% efficient.
7) Grid feeds run all panels in series instead of parallel, this means for the same power generated, you have less current flowing through your power cables. Power loss is calculated by IČ x R. I=current, R=resistance. So every time you double resistance, power loss quadruples. Copper wire has a resistance, if you want proof, feel thin jumper leads after you jump start a car, that warmth is power being burnt off in heat.
Do a search on wind speeds in your area, or invest in a wind speed monitor and work out your average speed before buying a wind turbine, you may be surprised how little wind you get over the kick in speed.
And a 1.5kw wind turbine only generates that at optimum speed, most people who install them are dissappointed with them.
Be an even bigger waste of resources to buy a wind generator and not get enough wind to generate anything.
They cant just be stuck on the roof either, they need to be up in clear air out of turbulence.
Neighbours tend not to care about solar panels on your roof, they might if you stick a propellor 30m in the air and try to convince them a whirring noise will help them get to sleep.
The blade diameter for a 1.5kw wind turbine is around 3m, that is big!
Even 1.5kw vertical axis turbines have a diameter of around 2m.
They just arent practical in a residential area.
Best investment I have made is a shed out of coolroom panels, I am heating the whole shed with a 400w heater working for 8 hours per day at the moment. Every tank is sitting on ~22 degrees.
If you are keeping African Cichlids drop the temperature on the heaters down to 21-22 degrees, you could be amazed how much power that saves you.
Stick 10mm poly around all your tanks to insulate better against heat loss.
Andrew
#33
Posted 04 June 2011 - 09:33 PM
Andrew you know I keep real fish, those that need hot water so to speak, not goldfish like those africans
#34
Posted 04 June 2011 - 10:03 PM
As of July power cost on A1 tariff is nearly 22c per kw.
The govt are backing out of the 40c rebate for new installs, us who got in quick have locked them in under contract for 10 years.
And I dont know where you got the astronomical income from???
I suppose if you dont waste all your money on mongrel fish that need to toughen up it might look that way.
#35
Posted 05 June 2011 - 12:51 AM
#36
Posted 05 June 2011 - 01:06 AM
#37
Posted 05 June 2011 - 03:16 AM
Attached is a calculator in .xls for rough estimates.
Attached Files
Edited by Niz, 05 June 2011 - 03:16 AM.
#38
Posted 05 June 2011 - 08:13 AM
The arguments from both sides about the feasility of having grid connected Solar PV systems is always interesting follow. You can clearly see that some are pro of the idea and some are con of the idea. There are lots of factors that would affect the payback periods such as increase in electricity costs, government doing back-flips, changes in your family circumstances, changes in working arrangements, and the list goes on. As much as you could do your sums, you still cannot be sure that in 10 years time, things are going to be as you estimated in your payback calculations.
I reckon that in 10-20 years time, two things could happen. One is that those who gone in and purchase a solar system would be seens as fools as the paybacks were not as it seems. Or the other would be that those who did not buy a grid connected solar pv system would be blaming themselves for not buying one back then, because the energy company has stopped any further connection to the grid. So who has a crystal ball??
There will always be two sides of the argument regardless. I think the uncertainty and the both sides arguments are similar to purchasing or not purchasing numerous properties in Perth in 2003/2004, with one side thinking "well Perth prices should soar shortly, let buy some real estate while it is still cheap" and the one side thinking "Where's is WA again? Who wants to buy there?".
#39
Posted 05 June 2011 - 08:46 AM
A 3kw system will average at 18 kw per day allowing for some factors in Perth.
At worst, if you dont send anything out you will offset power at 21c/kw.
That equals $3.78 per day, or $1380 per year.
So at $5k for the system, pay off is less than 4 years.
If you get good quality panels and inverter, look at $7k system and 5 year pay off.
But the better quality panels are more efficient, so would generate more, so pay themselve off quicker
That doesnt count power you send out to the grid and get paid more for.
Edited by werdna, 05 June 2011 - 08:49 AM.
#40
Posted 09 June 2011 - 12:26 AM
Sure the cost of having a solar system will eventually come down in price, but it would be a rude shock to those who are keen but are holding out a bit longer for price to drop to find out that six months later, the prices actually when up almost by 1/3.
I am glad I actually went in before the mad rush...
Edited by Ivan Sng, 09 June 2011 - 12:28 AM.
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