I'm with you guys and we actually had a bad transformer bushing at this site initially which was causing exactly that issue. The site still runs high (498-508Vac nominal) but is well below the 528V default upper limit of the TLs, and the shut-offs are not correlated with higher AC voltages. Also the 50TLs, which have the same voltage input window and are connected at the same panel, never have an issue. The fact that Solectria is willing to RMA the units without much more information than what I've given here tells me that it may be a systemic issue with this run of inverters, right?
Jerry, the inverters are loaded at a 1.18 ratio so minor clipping happens somewhat regularly. DC voltage never exceeds the 850V upper MPPT limit. 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. On Tue, Feb 25, 2020 at 2:02 PM Jason Szumlanski < ja...@floridasolardesigngroup.com> wrote: > It sure looks like it could be an AC voltage issue. Around here the > utility voltage is often high in the morning and then gets dragged down > when loads in the neighborhood spike from air conditioning (yes, even in > winter here in Florida). We see drop-outs (with other brand inverters) in > the mid-morning as a result. Usually the utilities here will resolve it if > you demonstrate the voltage is high, even if it's not out of their > acceptable range. > > Jason Szumlanski > > > > 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://mailtrack.io/trace/link/fa22d5123ede6619559172cc0b417b15f93fbb6b?url=https%3A%2F%2Fwww.linkedin.com%2Fin%2Fandrewtruitt%2F&userId=1613865&signature=0e80aee3c0f6304e> >>> >>> [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. 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