Friends:
We are in the midst of our first off-grid, DC coupled project using Tigo TS4-A-F RSS switches. In my few years installing solar I am accustomed to testing PV strings with a Fluke 87 for Voc, Isc, Vmp and Imp, or some combination. I do this regularly in the midst of installing PV so I can be confident once we are finished there will be no issues with the panels or the wiring. I understand these tests are not possible with the Tigo units. With the circuits unterminated, I can see the 0.6 VDC/Tigo with no keep-alive signal transmitted. With the signal being transmitted, I do not see the expected readings for Voc. I get only the 0.6/Tigo. When shorted into the Fluke DC input the Isc jumps around between 0 and about 2 amps. I was told by tech support the PV circuits need to be “terminated” at an inverter before any voltage or current can be measured. The circuits do not terminate in an inverter; they will connect to a charge controller (FM100, in this case). We have not pulled the PV feeders so connecting to the charge controllers is not yet possible. I am nervous about installing the remainder of the modules without knowing for certain they will produce as they should. What would you all do to assure yourselves the PV will produce once connected? TIA. William Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985
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