Andrew, I've seen this in multiple inverter systems when the AC voltage gets pushed outside the upper limit by the inverter output currents. One or two inverters will cycle on-off, those with the lowest setting or tolerance. Cause can be (1) high AC voltage from the utility to start with, and/or (2) high impedance looking into the grid from the inverters, usually from an undersized or loose service conductor. Jeff
On Tue, Feb 25, 2020 at 3:16 PM Jerry Shafer <jerrysgarag...@gmail.com> wrote: > Andrew > What is the AC Voltage when this occurs, to much VAC will shut down the > inverter. It also looks like you are clipping all the inverters during the > mid day, is due to low temps or does this always happen. What is the DC > MPPT voltage, is it at the upper limit. > Jerry > NABCEP PV inspector > > On Tue, Feb 25, 2020, 12:02 PM Andrew Truitt <atru...@gmail.com> wrote: > >> >> Wrenches, >> >> I have a couple of Solectria 36TLs at a small community solar site in CO >> that shut themselves down occasionally for what appears to be no reason. >> >> [image: image.png] >> >> Voltages and frequency are normal, firmware is updated, IR scan shows >> nothing irregular, and the other 2 inverters at the site (50TLs) are fine. >> It can happen under sunny or cloudy conditions. Solectria will RMA the >> inverters but before I go out and replace I'm curious if anyone has seen >> this behavior? >> >> >> Regards, >> >> Andrew Truitt >> >> www.dr.ventures >> d: 202.486.7507 >> >> NABCEP Certified PV Installation Professional ID: 032407-66 >> Colorado Journeyman Electrician License No.: 600132 >> >> <https://www.linkedin.com/in/andrewtruitt/> >> >> [image: Logo] >> >> The content of this email is confidential and intended for the recipient >> specified in this message only. It is strictly forbidden to share any part >> of this message with any third party, without written consent of the >> sender. If you received this message by mistake, please reply to this >> message and follow with its deletion, so that we can ensure such a mistake >> does not occur in the future. >> _______________________________________________ >> 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 >> >> _______________________________________________ > 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 > > -- Jeff Irish, PE <https://medium.com/gender-inclusivit/why-i-put-pronouns-on-my-email-signature-and-linkedin-profile-and-you-should-too-d3dc942c8743> | Vice President SunCommon.com | Main: 845-876-3767 13 Hook Road, Rhinebeck, NY 12572 <https://suncommon.com/solar-winter-discount-2020/> SunCommon believes that everyone has the right to a healthy environment and brighter future—and renewable energy is where it starts. Energy from the sun can power our lives and build vibrant communities. Our mission is to tear down barriers to clean energy and use our business as a force for good.
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