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NC-2009 EAc3:Enhanced Commissioning

Commissioning of renewable energy systems

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Peg Manuel
Tetra Tech
LEEDuser Basic Member
3 thumbs up

EAc3 requires the individual serving as the CxA to "be independent of the work of design and construction." It also states this person "must not be an employee of, or contravted through a contractor holding construction contract." Typically, PV companies are turn-key, one stop, design-build-commission. If there was a single company / subcontractor that designed, provided, installed, tested and commissioned a complete roof mounted PV solar system, will this credit be denied to our team? If so, is there any way around this - AFTER the fact?

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Fri, 10/24/2014 - 19:59

Does the project already have a CxA? It seems to me that the PV people can do their turn key thing with the CxA doing oversight. As for the after the fact? I'm hoping Scott will have better thoughts for you when he is back from Greenbuild.
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Scott Bowman
LEED Fellow
Integrated Design + Energy Advisors, LLC
LEEDuser Expert
377 thumbs up

Sun, 10/26/2014 - 02:37

Susan is right again. This is a very typical delivery method, but as long as the CxA oversees the testing, and has some say in the methodology, then that is acceptable. Installers often say "commissioning" when they really mean "check out". I have seen great variation in the procedures used. For example, there was a case where the PV was reporting negative values from their proprietary metering to the BAS system, which was programed to subtract the production from the building use...as you have already guessed, building energy use went up! The key to PV is the integration to the building systems and electrical metering, and many times that is not something the installer is doing, so there are still items to be commissioned. As for the "after the fact", I would strongly recommend that the CxA develop a testing protocol and get out there and do the performance testing and provide an addendum to the commissioning report if it is already issued.

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