[RE-wrenches] Wire short?

[larrycrutcher]

BTW, DC Clamp on meters are now cheap and feature rich and surprisingly reliable. Check out the UNI-T UT203. Cheap enough that we used these to give as gifts to customers.

Larry



On Apr 4, 2022, at 9:24 AM, larrycrutcher via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:

Check short circuit (Vsc) on each string to see if a PV module is failing. Voc can be deceptive with no load. 

Larry Crutcher
Starlight Solar Power Systems



On Apr 4, 2022, at 9:12 AM, Chris Daum via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:

Hey folks:
 
We have a problem we just can’t figure out.  We have a customer in OK with a simple array of eight Trina TSM 310-DD05H(II) modules, four stings of two modules into the combiner (Midnite MNPV6).  Simple, right?  He connects two modules, gets his 73.2VDC and lands his PV output leads on the circuit breaker and discovers he only has 39VDC.  So, what are the possibilities?  Loose connections at the MC4 connectors?  Bad blocking diode?  Ideas anyone?
 
He’s in Henryetta, OK, and we cannot seem to find anyone local to help him.  All ideas appreciated!
 
Best,
 
Chris Daum
Oasis Montana Inc.
406-777- 4321
406-777-4309 fax
www.oasismontana.com
 
 
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