I second Jay's request for some numbers, I'm curious about this not having participated directly in any bifacial projects yet. The difference in Voc and Vmp ratios is interesting.
Brian Mehalic NABCEP Certified Solar PV Installation Professional™ R031508-59 National Electrical Code® CMP-4 Member (520) 204-6639 Solar Energy International http://www.solarenergy.org SEI Professional Services http://www.seisolarpros.com On Mon, Nov 2, 2020 at 8:55 AM Jay <[email protected]> wrote: > Hi Jason, > > What are you seeing in terms of measurements? > > Temp air/module > Voc > Irradiance > Etc > > Jay > Peltz power > > > > On Nov 2, 2020, at 8:18 AM, Jason Kechijian <[email protected]> wrote: > > > > Hey wrenches, > > > > Does anyone have any guidance to which values to use when testing open > circuit voltage on bi-facial modules, considering you take the temperature > reading from the cell vs. the back sheet? Also, what would be the correct > module Voc to use since there are values for both the front and back? > > > > 405W Module: Front/Back > > Pmpp: 405 / 285 > > Vmpp: 40.89 / 41.10 > > Impp: 9.91 / 6.94 > > Voc: 48.42 / 46.99 > > Isc: 10.38 / 7.28 > > Module efficiency: 19.7% / 13.9% > > Temp coefficient Pmpp: -0.3528%/ºC > > Temp coefficient Isc: +0.0400%/ºC > > Temp coefficient Voc: -0.2769%/ºC > > Nominal: 44+/-2ºC > > > > I was using the front Voc and Voc temp coefficient, but I am getting > some results which are not in line with the 5% of expected. > > > > Jason D. Kechijian, LEED AP > > NABCEP Certified PV Installation Professional™ > > > > > > > > _______________________________________________ > > List sponsored by Redwood Alliance > > > > List Address: [email protected] > > > > Change listserver email address & settings: > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > There are two list archives for searching. When one doesn't work, try > the other: > > https://www.mail-archive.com/[email protected]/ > > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > > > List rules & etiquette: > > http://www.re-wrenches.org/etiquette.htm > > > > Check out or update participant bios: > > http://www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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