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Sunday, February 19, 2012

Pre-commission Testing (Saturday Morning)

Today (Saturday February 18, 2012) the solar installers came back to tidy up and test everything on the roof. When they were leaving Vinnie gave me the card on which he had written the open circuit voltages.  The three inverters each have 3 strings of eleven panels (33 PV panels per inverter).  Each eleven panel string makes a "home run" to the junction box of one inverter.  So voltages were taken at each non-grounded lead, separately within the junction boxes.  By inverter (Left, Middle, Right) the test voltages are listed here.

Left
375 vdc
377 vdc
374 vdc

Middle
379 vdc
378 vdc
377 vdc

Right
378 vdc
374 vdc
378 vdc

This was done at about 11 o'clock.  The panels were very dusty and later in the day we washed all 99 panels with Dawn dish detergent and soft water, using a window mop/squeegee combination handle on a 5-foot paint roller extension.  Washing all of them took about an hour for 3 people handling the hose, bucket, and mop/squeegee.  We had to avoid spraying water near any of the open pull elbows -- the covers are with the AC electricians who will be coming to finish wiring from the combiner to the meter and disconnect and service panel.  If all goes well the APS inspection and the Glendale building inspection (final) will allow commissioning of the PV co-generation service by next week.  I was informed by SRSW this morning (Monday) that the City of Glendale will hand off their approval to APS, possibly by snail mail.  After APS gets the nod, then it is up to them to commission the system for co-generation on their power grid.

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