Goole_Solar Community2022-06-10 14:15
As shown in the previous poster, the Covid-19 pandemic has greatly impacted the way people live, including maintenance staff in PV industry. In some unexpected situations, we need to turn off the inverter to protect the PV system, but what if there is no one on site? Here we also name this situation emergency absence.
The remote shutdown function that comes with the inverter can be realized by a shutdown function circuit integrated into the inverter and a switch. It requires the combined action of an on-off switch, long-distance communication, and a control mechanism via signals.
The on-off switch can be deployed in a remote place, where the operator can turn on or off the switch at a safe distance to control the inverter. Communication cables such as RS485 are used to connect the inverter and switch to transmit signals of remote shutdown. To realize communication between multi-inverters and one switch, inverters should be connected hand in hand as shown in the figure below. When the operator turns on the switch, signals of remote shutdown shall be sent to multiple inverters at the same time, and the inverters should disconnect from the grid and stop power output within 0.5s.
Similar to the principle of the remote shutdown, the GoodWe monitoring platform SEMS Portal integrates the function of shutdown. By one click on the website, the GoodWe cloud server will send a signal to the inverter through the communication tools and then shut down the inverter on the AC side in minutes.
Stay tuned for the upcoming technical articles on our forum and your advice matters!