Friends:
I am repairing a system installed by others. The production is far below what I calculated it should be and what it used to produce before being worked on. The string voltages and currents do not makes sense with the number of panels on each string. The system has NEP PVG-2 smart rapid shut-down devices. 13 of 18 are reporting. It turns out the missing 5 were never programmed into the monitor. Three of the PVG-2s on one string were reporting with zero watts. Other PVG-2s on the same string were reporting power production. All modules tested good for Voc and Isc. This of course makes no sense that some RSDs on a string would produce no power and others did report power production. I suspect bad RSDs. To unravel this mystery I want to bench test the RSDs. I bought a PVG-T tester. It is used to test strings after installation. Is it possible I can test a string of one RSD on the bench? I would input into PV input 1 from a bench power supply and test for voltage at the string output connectors. Has anyone tried this? Thanks in advance. William Miller Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org 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
