Rule 21 has been in effect in California since September 2017. This is a regulation that requires inverters installed in the state of California to be able to perform certain "Advanced Grid Functions" or AGFs. This regulation has been developed for over four years by the State of California and will be rolled out in 3 phases. As of the date of this writing, we are within in Phase 2, which covers communication protocols.
As a part of this regulation, as of July 26th, 2018, inverters installed in California will now require the reactive power priority (RPP) setting to be activated as the default Volt/Var function. All Rule 21 inverters should have this setting. It will be important to determine if your Rule 21 inverter comes with this setting activated by default or if it must be activated manually by the installer. This can be determined with the following list of equipment.
Below is a summary of the list provided by Go Solar California.
List of manufacturers who have 100% of current products compliant with Rule 21 (as of January 23rd, 2019):
- Altenergy Power System Inc.
- Canadian Solar Inc.
- Chint Power Systems America
- Darfon Electronics Corp.
- Delta Electronics
- Destin Power Inc.
- Dynapower Company LLC.
- Enphase Energy Inc.
- EPC Power Corp.
- Fronius International GmbH
- HiQ Solar
- Huawei Technologies Co., Ltd.
- Ideal Power Inc
- Jinko Solar Co.
- LeadSolar Energy Co., Ltd.
- LG Electronics Inc.
- Ningbo Ginlong Technologies Co.
- One Sun, Mexico S.A. DE C.V.
- OutBack Power Technologies, Inc
- Pika Energy
- Power Electronics
- REFU Elektronik Gmbh
- Rhombus Energy Solutions
- Schneider Electric Solar Inverters USA, Inc.
- Shenzhen Growatt New Energy Technology Co., Ltd
- Shenzhen Sinexcel Electric Co., Ltd
- SMA America
- SolarEdge Technologies Ltd.
- Sparq Systems Inc.
- Sungrow Power Supply Co., Ltd
- Tabuchi Electric Co., Ltd.
- Trina Energy Storage Solutions Co., Ltd
- Xiamen Kehua Hengsheng Co., Ltd.
- Yaskawa Solectria Solar
To learn more and see specific models, see PGE's Reactive Power Priority Inverters spreadsheet.
Originally posted 8/6/2018, and updated 1/23/2019