[Greenbuilding] Greenbuilding Digest, Vol 46, Issue 8
barbara deane-gillett
deaneg at hotmail.com
Fri Jun 13 15:04:40 CDT 2014
carmen youve got to stop mixing up kw and kwh and, wh and kwh and " , " with "." .
the output of the first system is reasonable . i typically see 1 ( shady cloudy misoriented ) to 1.5 ( no shading optimal with reflection or tracking) kwh per year output per installed dc watt in new england.
a system of 11.03 kw dc should produce about 11.03/5.88 = 1.875 times as much not 10838/6376 =1.70 times as much.
sunpower makes the most efficient panels getting close to 20% most are around 15%. if you are area limited it can make sense to pay the premium. since the panels are more efficent there is less cost per watt for the ancillary racking wiring, overhead marketing permiting etc. and in some cases it can pay to go with the premium panels.
good luck, get it done.
> From: greenbuilding-request at lists.bioenergylists.org
> Subject: Greenbuilding Digest, Vol 46, Issue 8
> To: greenbuilding at lists.bioenergylists.org
> Date: Fri, 13 Jun 2014 12:00:01 -0600
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> Today's Topics:
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> 1. Efficient Solar Panels (Carmine Vasile)
> 2. 2nd try RE: Efficient Solar Panels (Carmine Vasile)
> 3. Re: Efficient Solar Panels (RT)
>
>
> ----------------------------------------------------------------------
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> Message: 1
> Date: Thu, 12 Jun 2014 16:12:27 -0400
> From: Carmine Vasile <gfx-ch at msn.com>
> To: GB Forum <greenbuilding at lists.bioenergylists.org>
> Subject: [Greenbuilding] Efficient Solar Panels
> Message-ID: <SNT148-W7089470136C92F243450549A2A0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
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> Does anyone know of a company that leases solar systems with efficient Solar Panels? The Solar City system described in the App note linked to http://gfxtechnology.com/
>
>
>
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> Message: 2
> Date: Thu, 12 Jun 2014 16:37:44 -0400
> From: Carmine Vasile <gfx-ch at msn.com>
> To: GB Forum <greenbuilding at lists.bioenergylists.org>
> Subject: [Greenbuilding] 2nd try RE: Efficient Solar Panels
> Message-ID: <SNT148-W428C695AF1D15D2764D6679A2A0 at phx.gbl>
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> The unfinished email below was sent by mistake. Here's the complete version:
> Does anyone know of a company that leases solar systems with efficient Solar Panels? The 99%-Solar City system described in the App note linked to http://gfxtechnology.com/ has 24 panels rated @ 5.88 kW DC (~350 Volts, 16.8 Amps), but its Annual Production is only 6,376 kWh (0.266 kWh/Panel). Solar City engineers also designed a system for our all-electric house that can produce only 72% of its annual usage: 10.838 kWh; rated @ 11.03 kW DC. Our utility doesn't allow ground-mounted arrays or use of our carport, so to attain 99% we need panels capable of delivering at least 0.37 kWh/yr. Any suggestions?
> Best regards,Dr. Carmine f. Vasile
> From: gfx-ch at msn.com
> To: greenbuilding at lists.bioenergylists.org
> Subject: Efficient Solar Panels
> Date: Thu, 12 Jun 2014 16:12:27 -0400
>
> Does anyone know of a company that leases solar systems with efficient Solar Panels? The Solar City system described in the App note linked to http://gfxtechnology.com/
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> Message: 3
> Date: Thu, 12 Jun 2014 18:02:27 -0400
> From: RT <ArchiLogic at yahoo.ca>
> To: "Green Building" <greenbuilding at lists.bioenergylists.org>
> Subject: Re: [Greenbuilding] Efficient Solar Panels
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> On Thu, 12 Jun 2014 16:37:44 -0400, Carmine Vasile <gfx-ch at msn.com> wrote:
>
> > system for our all-electric house that can produce only 72%
>
> > to attain 99% we need panels capable of delivering at least
>
> Don't know nuttin' about nuttin' about PV gizmology and can't help you on
> the leasing companies ... but I do remember my neighbour, a theoretical
> physicist at the (Canadian) NRC, telling me about the Fresnel
> lenses-based concentrated PV systems that he had been playing with where
> PV cells the size of one's fingernail could replace the much larger PV
> arrays one typically sees around the neighbourhood.
>
> If available roof-top mounting area is a limiting factor (as seems to be
> CV's case) then it would seem that the Fresnel lenses concentrators might
> be useful .
>
> Also, I do know that tracking systems seem to increase a system's
> performance by about 30-40% (or more) in my neighbourhood (when comparing
> the production of two identical sized 52 panel arrays within a few
> concession roads of each other).
>
> But as to which approach would provide the biggest bang for the buck, I
> haven't a clue but my my wild-@$$ guess would be the Fresnel lens
> concentrators simply because fewer PV cells would be required and Fresnel
> lenses should be fairly cheap.
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