System Performance Metering

At a minimum, a customer should be able to determine the amount of energy produced by the solar installation. The meter would not be used for billing purposes, but merely allows the customer to track system performance and make adjustments or repairs as necessary. Many systems already include an inverter with self-contained internal metering and display equipment. The CSI should require systems without this feature to install inexpensive, non-utility-grade performance meters. The CEC develops and maintains a list of acceptable performance meters and inverters with built-in meters for the ERP, and we propose the CPUC adopt the CEC-preferred equipment as an eligibility requirement for the CSI.