I live in Northern MN and we get very cold days (-50F +) and very crisp clear days when it’s this cold. I’ve seen 1333 WM2 on the same plane as my array with snow reflecting sun light. Using the daystar irradiance meter. I am at 1400’ so your increased elevation with very cold temps, snow and edge of cloud could maybe cause it. Maybe a calculation of extremes could give you an idea. Rearrange the formula and get the irradiance needed to cause this high of watts.
Jesse Dahl NABCEP PV Installation Professional IBEW Local 292 - Electrician Electrical/Solar PV Instructor - HCC Sent from my iPhone > On Nov 22, 2018, at 12:10 AM, <br...@willpowerelect.com> > <br...@willpowerelect.com> wrote: > > Compadres, > > I have 4 identical arrays of 3 strings of 3 Solarworld SW 245 mono (2010 > model) to FM80s. When designing, not exceeding 150 voc was critical. No > record temp data available. Location ~ 4,000' Pacific Northwest. Recently > replaced an FM80 with 6 blown FETs showing max power at 3075 watts! This from > a 2205 watt array into a 24 volt battery. Max historical voc is ~120. My > guess at record low temp is -10F. tc%/ºC MPP doesn't get anywhere close. What > would the WM2 need to be in order to achieve 3075 watts on a 2205 watt array? > BTW, 2 of the four original chargers are still working fine and one of them > also shows 3075 watts max power. Edge of cloud effect against snow field at > bottom of array? > > Cheers, > > Bruce Fiero-RMI > > <sigimg0> > > "Energizing the Rogue Valley" > > 4115 S Pacific Hwy > Medford, OR 97501 > > P: 541.535.3965 > F: 541.512.0061 > E: br...@willpowerelect.com > W: Willpower Electric, LLC > > CCB 191852 > Oregon Electrical Contractor C681 > NABCEP Certified Solar (PV) Installer 031409-38 > DUNS 191470363 > Energy Trust of Oregon Trade Ally Solar (PV) Installation & Energy Efficient > Commercial Lighting Programs > > > **This email may contain information that is privileged, confidential, or > otherwise exempt from disclosure under applicable law. If you are not the > addressee, or if it appears that you have received this email in error, > please advise me immediately by reply email, keep the contents confidential, > and immediately delete the message and any attachments from your system. > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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