The primary goal of rapid shutdown devices is to ensure the safety of people and property in the vicinity of solar installations. In emergencies like fires, utility workers and emergency responders need to be able to safely access the area without the risk of electrocution from energized solar panels. RSDs help mitigate this risk by quickly shutting down the system and reducing the voltage to a safe level, allowing for a more secure working environment.
In the event of an emergency or fire, the rapid shutdown device quickly disconnects the solar panels from the electrical system. This reduces the risk of electrocution for firefighters and other first responders. Compliant with code requirements, the rapid shutdown device disables the system within 10 seconds, limiting current and providing system status feedback and notification. Allows for larger array configurations by reducing the potential for dangerous DC arc faults that can occur when panels are damaged or slowly disconnected.
Rapid shutdown devices work by de-energizing solar arrays in a matter of seconds. They are typically installed close to the solar panels, either at the module or string level. When an RSD is activated, it disconnects the conductors between the solar panels and the inverter, effectively cutting off the flow of electricity. This reduces the voltage in the system to a safe level, typically below 30 volts, within 30 seconds of activation.
There are different ways to activate rapid shutdown devices, including manual switches, remote activation, or automatic detection of emergencies. Manual switches are usually installed at a central location, like an electrical panel, and can be operated by personnel on-site. Remote activation allows utility workers or emergency responders to shut down the system from a distance, which can be particularly helpful in cases of hazardous conditions or limited accessibility. Some RSDs are equipped with sensors that can detect emergencies, such as fires or sudden voltage fluctuations, and automatically initiate the rapid shutdown process.
String-level rapid shutdown devices, on the other hand, are installed at the level of the string of solar panels. A string is a group of panels connected in series, and each string has its own rsd. When activated, these devices de-energize the entire string of panels, rather than individual modules. While not as precise as module-level shutdown devices, string-level RSDs still provide a significant improvement in safety compared to systems without any rapid shutdown measures in place.
Centralized rapid shutdown devices are installed at a single, central location in the solar energy system, typically near the inverter. When activated, these devices de-energize the entire solar array. While this approach may be more cost-effective and require fewer components, it may not provide the same level of safety as module-level or string-level RSDs, as there can still be residual voltage in the conductors leading to the centralized device.
| Model | MDRSD |
|---|---|
|
Max DC Voltage |
1500 Vdc |
|
Max DC Current |
40A |
|
Parameters |
1500V26A,1000V40A,600V40A |
|
DC Connector |
MC4 |
|
Nominal Voltage |
230Vac |
|
Operating Voltage |
100-270 Vac |
|
Nominal Frequency |
50Hz |
|
Operating Frequency |
47-53Hz |
|
Nominal Current |
30mA |
|
Max Current |
300mA |
|
AC Connector |
Plug-in |
|
Protection Degree |
IP65 |
|
Protection Level |
Class Il |
|
Certification |
CE |
|
Switch According To |
EN60947-3 |
|
Number Of Operations |
>10000 |
|
N. Of Operations Under Load |
>1500 |
|
Operating Temperature |
-20°C~70°C |
|
Temperature Sensor Trigger |
70°C |
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