An isolation switch for PV has two very important advantages to offer to photovoltaic systems for the safe disconnection of the DC circuit during maintenance or in any case of emergency. In residential systems, voltages are normally around 600V, while in some commercial installations, this could go up to 1500V and the isolator switch allows for safe handling of such high voltages. The switch reduces electric shock in isolating the PV array from the inverter, thus making the working conditions for technicians a lot safer in that they would not be exposed to a live current.
One of the major advantages which come with a PV isolation switch is an increase in the safety level of the system. A PV isolator herein, such as provided by IEC 60947-3, would need to correspond to strict durability and performance criteria that can enable the parts to stand up to the high voltage DC circuits. In case of emergency shutdown, for example, it cuts the power to the inverter and other down-stream components of the system to prevent possible damage. This layer of protection greatly reduces repair costs, which can be astronomically high: inverter replacements alone range from $1,000 to $3,000 for residential systems.
Thus, IP66 and IP67-rated isolator switches for outdoor PV installations are more resistant to dust and water; hence, they are able to work reliably in different weather conditions. These ratings are so important for systems operating in harsh environments that they help prolong the life of the switch, reducing maintenance efforts. For example, Solar Power World maintains that 30% less maintenance on the system lifetime can be ensured with a system with high-quality and weather-resistant isolators than with one that has no kind of protection.
Along with safety, the PV isolator switch contributes to efficiency in operation. In cases of routine maintenance, technicians can easily isolate parts of the PV array, saving time for the overall shutdown period of the system and allowing faster repair turnarounds. This feature is very useful in commercial PV installations wherein lost energy is produced because of prolonged shutdowns. The isolator switch, by providing access to an easy and reliable shutdown option, supports uninterruptible energy output and reduces downtime costs.
A high-quality PV Isolator Switch increases both the safety and efficiency of a PV system. Switches play a crucial role in the protection of both people operating systems and equipment and help to support longer system life, reliably with lower operational costs.
