Re: [RE-wrenches] Bi-facial Open Circuit voltage testing

A few more questions: Can you attach the spec sheet? Does it show curves at different irradiances? What was the time of day (or was it just cloudy?). How are you measuring the cell temp? Brian > On Nov 3, 2020, at 8:50 AM, Jason Kechijian wrote: > Hey Jay and Brian, > > System: 2p SAT > Mo

Re: [RE-wrenches] Bi-facial Open Circuit voltage testing

I see your question now a bit more clearly. As usual it brings up a new one. How low is the winter temp for location? Off the cuff I would use the manufacture data and it is good because it is higher than you measured at 23C. Any guidance from panel manufacturer who is? Dave Angelini Offgrid

Re: [RE-wrenches] Bi-facial Open Circuit voltage testing

Hey Jay and Brian, System: 2p SAT Mods/String: 27 Measurements taken on average of CB Ambient: ~23ºC Module: 21.4ºC Wind: moderate Irradiance: 500W/m2 Expected Voc: 1,320.37 Testing based on IEC 62446 Measured Voc on a range of 9 string combiner: 1251 - 1271. 1251 being the only string in the

Re: [RE-wrenches] Bi-facial Open Circuit voltage testing

Hey Jason, IEC 62446-1 allows for: Testing Voc of a single module and using that to calc the target string voltage and "For systems with multiple identical strings and where there is stable irradiance conditions, voltages between strings can be compared" Regardless, it would be interesting to hav

Re: [RE-wrenches] Bi-facial Open Circuit voltage testing

I would recommend testing the temp gun against other sensors like a thermocouple and the DAS if it’s available. Brian > On Nov 3, 2020, at 1:18 PM, Jason Kechijian wrote: > > Hey Brian, > > Following up on both sets of questions: > > Can you attach the spec sheet? Does it show curves at di

[RE-wrenches] Aurora PVI 4.2 inverter

Hi All, Does anyone know if any manufacturer is currently responsible for warranty issues of 2013 Aurora PVI 4.2-OUTD-S-US inverters? I don't remember if this is an "ungrounded" inverter, but in any case, if it needs replacement, what are the code rules for replacing it with a different inverter? I

Re: [RE-wrenches] Aurora PVI 4.2 inverter

Hi Howie ABB (now Fimer) 1-877-261-1374. They typically require specific photos for warranty. Error code 031 is common. Junk arc fault detector that require upgrade also common. Thanks Rich Sent from my iPad > On Nov 3, 2020, at 5:52 PM, Howie Michaelson > wrote: > >  > Hi All, > Does anyone

Re: [RE-wrenches] Bi-facial Open Circuit voltage testing

Hey Brian, Following up on both sets of questions: Can you attach the spec sheet? Does it show curves at different irradiances? — ATTACHED What was the time of day (or was it just cloudy?). — ~11:00am How are you measuring the cell temp? — Fluke Temp gun (new battery) The string voltages were