What I usually do is knock 20% off of the rated power of a panel to make up for 'real world" conditions, and battery inefficiency, then I size from there. When the factory tests panels they have perfect light conditions which does not apply to real world conditions, ie. smog etc. Panels are rated as follows; Open cirquit voltage, (Voc), Maximum power voltage, (Vpm), Short cirquit Current, (Isc), Maximum power current, (Ipm), Maximum power, (Pm), Minimum power (Pm), and Module efficiency. SUNcerely, Frank Fowler Crystal Pines Alternative Energy 4408 Pine Cluster Ln. Yankee Hill, CA. 95965 530-532-1972 www.solarenergy-alt.com [EMAIL PROTECTED] ----- Original Message ----- From: "Florin Fleseriu" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, May 23, 2004 10:36 AM Subject: RE: [microhydro] Help!
> That is correct Frank ...but then the power is not the one that is mentioned > on the specs . Am I right ? > > so.... then if the maximum current could be only 6.5A ... then the panel > produced only 12Vx6.5A = 78W > and not as they said. > So ... the 110W panel is only 78W panel ! Am I right ???.. and this has abig > impact on design . > > Regards, > Florin > > > -----Original Message----- > From: Frank Fowler [mailto:[EMAIL PROTECTED] > Sent: Sunday, May 23, 2004 4:35 PM > To: [EMAIL PROTECTED] > Subject: Re: [microhydro] Help! > > > Tom, > When you hook the batteries up to the system, the charging voltage will > drop to charge your batteries. 17 voltsdc listed on the panel is 17vdc > open > cirquit. > SUNcerely, > Frank Fowler > Crystal Pines Alternative Energy > 4408 Pine Cluster Ln. Yankee Hill, CA. 95965 > 530-532-1972 > www.solarenergy-alt.com > [EMAIL PROTECTED] > ----- Original Message ----- > From: "Tom DeBates" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, May 23, 2004 7:26 AM > Subject: Re: [microhydro] Help! > > > > Hello Florin, > > I would suggest that you go to the website > > www.nrel.gov for an overview of PV system basics and > > some good links. Through these links you should be > > able to find a chart to aid you in sizing your system. > > If you cannot find one, I have developed one that I > > use for these purposes. > > good luck, > > Tom DeBates > > --- ffleseru <[EMAIL PROTECTED]> wrote: > > > Hi guys, > > > > > > I'm very confused related to the PV energy > > > production. I don't > > > understand where is the truth. > > > > > > I need for example to use Daily PV Energy Budget - > > > 1313Wh/day from a > > > solar energy system, at 12 V/220V. (Only a TV set + > > > lights) > > > > > > - Bright Sunshine - 6 Hours > > > - 3 days of autonomy > > > > > > Based on my calculation the results are: > > > > > > - Total Rated Battery Capacity calculated 729 Ah > > > - Using batteries at 6V/450Ah I need 4 batteries > > > connected in > > > series/parallel > > > > > > And if I'm using Siemens PV - SP110 with the > > > following > > > characteristics, 110W - 6.47A/17V > > > > > > Based on this then I need 3 modules on parallel. Am > > > I right? But.here > > > is the confusion that I have. > > > > > > Those panels produce according with Siemens specs at > > > 6 h bright > > > sunshine - 6x110W = 660W per day !.. but my system > > > works with 12 V > > > not 17 V!! .. So the results should be 6h x6.47A > > > x12V = 465W ! . well > > > my question is : > > > > > > Where are 200W?. because as far as I understand the > > > max current > > > generated will be 6.47Amps .. and not more? > > > > > > I hope you guys can help me ! > > > > > > Thanks, > > > Florin > > > > > > > > > > > > > > > > > > > > > > > > __________________________________ > > Do you Yahoo!? > > Yahoo! Domains - Claim yours for only $14.70/year > > http://smallbusiness.promotions.yahoo.com/offer > > > > > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? If not, please register free of > charge and be exposed to the microhydro community world wide! > > > > NOTE: The advertisements in this email are added by Yahoogroups who > provides us with free email group services. 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