Online or remote verification of solar photovoltaic (PV) metering equipment data for the New Solar Homes Partnership (NSHP) Program has become a common method for monitoring PV production. These systems use online software, also known as Cloud Metering.
Approved training procedures and NSHP guidance state that, "To qualify for incentives under NSHP, PV systems must have a stand-alone performance meter or an inverter with a built-in performance meter that measures AC power output."
Question: Can a HERS Rater review online or remote displays of the energy production from a PV metering system to meet the requirements for verifying system production when completing HERS documentation used in the NSHP Program?
Answer: Yes. The California Energy Commission (CEC) has determined that for purposes of verifying data for the NSHP program, the use of remotely displayed or online data is no different than meters with a built-in display, as the physical production meter is still located on site and only the display of data is remote or online.
Question: A second issue has arisen when a multiple-string system is installed and the monitoring system captures the "aggregated" production values for the PV system as a whole, but not by inverter. This prevents the HERS Rater from reporting the individual production figures as required by NSHP. How can this be reported properly?
Answer: On Sept 5, 2019, the CEC responded with this comment: After discussing with program staff we have come to the conclusion that per NSHP guidebook requirements, production figures must be provided for each individual inverter/array. At the present time the NSHP program does not allow for the production figures to be aggregated amongst multiple arrays/inverters.