Results 41 to 50 of 163
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09-12-2012, 07:17 PM #41
- Join Date
- Oct 2011
- Posts
- 1,086
- Location
- NJ
- Tractor
- JD 4410, NH TC-25, Bobcat M610, JD X534, Dig-It Model 158, JD Ztrak 737. 6X4 Gator
Re: 25 kW Solar power project in Iowa.
I have often thought thatit should be possible to build a tracking system which is passive. Something that makes use of solar power to drive the panels. I see two possibilities, the first would be dc powered actuators which operate from their own solar panels. The second would use a gas charged actuator and some linkage. As the sun heats it up gas pressure builds and this drives the linkage to rotate the panel.
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09-12-2012, 07:36 PM #42
- Join Date
- Aug 2005
- Posts
- 4,033
- Location
- NE TENN (Hancock Co)
- Tractor
- Kioti DK40SE Hydro
Re: 25 kW Solar power project in Iowa.
I got news for ya...covering the panel with a blanket will NOT block all the UV getting to it. I tried that with my pond pump 135 watt panel....the pump still ran and pumped water while the panel was covered. So be careful..
2008 KIOTI DK40Se Hydro
1978 Sling Blade/wood handle
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09-12-2012, 07:54 PM #43
- Join Date
- Jul 2011
- Posts
- 780
- Location
- Grantham, South East Queensland
- Tractor
- Kioti CK30 HST
Re: 25 kW Solar power project in Iowa.
The micro inverters are definitely the way to go and more folks in Oz are starting to utilize them. I didn't even know they existed when I installed my system and they would have been great for me as I suffer partial shading in the afternoons. I think my efficiency could have improved as much as 25 - 30 % if I had used micro inverters. I also found out too late I could have used a switching inverter that maintains supply to your home if the grid goes down. You only need a small battery backup for that.
You can see in my photo where the micro inverters would have been an asset due to shading. My sys. is 4KWh.
With a CK30 you have the whole world in your hands.
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09-12-2012, 07:57 PM #44
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09-13-2012, 02:57 AM #45
- Join Date
- Nov 2008
- Posts
- 4,291
- Location
- South Central Iowa
- Tractor
- TYM 330 HST with FEL
Re: 25 kW Solar power project in Iowa.
The problem is the size. 25 kW system is about 170 sqm or 1820 sqft. The cost of the tracking can be amortised only if it provides more gain than can be gained by increasing number of the panels. At current cost/W it is hard to justify. It would make sense much farther north where summer days are long while the sun is big part of the day behind (north of) the panels.
Tracking system is very costly in Iowa because it has to be designed to withstand at least 160 kph or 100 mph wind.Ladia
My PWS http://www.wunderground.com/personal...d?ID=KIANEWVI3
My PV system https://enlighten.enphaseenergy.com/...ems/h2eX136588
Astronomy http://www.suncalc.net/#/41.6154,-93...14.06.25/19:21
World weather https://www.ventusky.com/
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09-13-2012, 03:02 AM #46
- Join Date
- Nov 2008
- Posts
- 4,291
- Location
- South Central Iowa
- Tractor
- TYM 330 HST with FEL
Re: 25 kW Solar power project in Iowa.
Ladia
My PWS http://www.wunderground.com/personal...d?ID=KIANEWVI3
My PV system https://enlighten.enphaseenergy.com/...ems/h2eX136588
Astronomy http://www.suncalc.net/#/41.6154,-93...14.06.25/19:21
World weather https://www.ventusky.com/
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09-13-2012, 06:20 AM #47
Originally Posted by Redneck in training
It's a race to see who can get the most welfare while still complaining about those "deadbeats" (read: other people) who get welfare.
Funny, I never thought of theft as an investment.
Sorry, am I not being civil enough? Thank you for making my taxes higher to offset your welfare. There now you can feel all better.
I do think it is great to see solar getting popular, but not at taxpayer expense. People requiring the addition of welfare credits in order to make the cost feasible just goes to show solar simply isn't yet meant for people who have other power options.
Right now, at rates of $0.13 per kw/ h, solar isn't an investment, it's an alternative, only the welfare check makes it pay off. Besides the green-ness, it isn't yet value added. There is very little, if any, net gain with current technology, as redneck's power output and monetary math reveals.
In other words, unless your per kilowatt costs are far higher, just steal from your neighbors and forget the array. The result is the same, just with slightly more carbon emissions and far less red tape.
Sent from my SCH-I500 using TractorByNet
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09-13-2012, 06:45 AM #48
- Join Date
- Jul 2011
- Posts
- 780
- Location
- Grantham, South East Queensland
- Tractor
- Kioti CK30 HST
Re: 25 kW Solar power project in Iowa.
Domush. We pay 23c KWh here in Oz. Makes solar very attractive.
With a CK30 you have the whole world in your hands.
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09-13-2012, 06:52 AM #49
Originally Posted by Alien
Sent from my SCH-I500 using TractorByNet
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09-13-2012, 07:26 AM #50
- Join Date
- Apr 2009
- Posts
- 12,795
- Location
- nowhere, md
- Tractor
- Hanomag
Re: 25 kW Solar power project in Iowa.
Ladia,
Last night I played around with PVWatts(ver. 2) for your general location. I found that using optimal seasonal panel angles of: (55* Nov. Dec., Jan. Feb.), (41* Mar., Sep., Oct.) and (25* Apr-Aug.) results in roughly a 5% annual gain in panel output. That is lower than I expected. It amounted to an additional 57 kWh per 1kW of system capacity per year.
Just checking
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