No Limit on the Number of Grid-Connected PV Inverters
Sanyo Denki Co., Ltd. has developed a 3-phase PV inverter, the SANUPS P73J, that can shorten the installation time of multi-inverter grid-connected systems. It can be safely used outdoors with its IP65 rated waterproof and dustproof performance. The SANUPS P73J supports an unlimited number of grid-connected PV inverters to be operated in parallel in a single system.
This 3-phase inverter includes the industryâ€™s new standard islanding detection method â€œfrequency feedback method with step injectionâ€ which supports the connection of multiple units to the grid with virtually no limit on the number. This is a new method for detecting a power outage in the commercial grid in Japan and was developed to enable the installation of large-scale solar systems.
These 10kW high-frequency transformer isolated inverters operate over an input voltage range of 150- to 570-Vdc and produce an output of 202Vac 50/60 Hz. In addition to the active â€œfrequency feedback method with step injectionâ€ islanding detection function, these inverters include â€œvoltage phase jump detectionâ€ passive islanding detection.
The P73J exempts users from a test required for the grid-connection agreement with power companies, greatly reducing installation costs and time. It is certified by Japan Electrical Safety & Environment Technology Laboratories (JET).