Rated Voltage(V) Maximum Continuous Operating Voltage(Uc) Nominal
Discharge Current(In)(8/20μs) Maximum Discharge
Current(Imax)(8/20μs) Protection Level(In)Up Protection Grade DC
500V DC 530V 5KA 10KA ≤1.5kV IP20 DC 800V DC 840V 20KA 40KA ≤3.0kV
DC 1000V DC 1060V 30KA 60KA ≤3.2kV Surge protective devices (SPDs)
are commonly installed in solar combiner boxes under the following
conditions:1. When the solar power system is connected to sensitive
loads. If the solar power is used to supply power to electronics,
computers, or automation equipment, SPDs help protect these devices
from voltage spikes in the solar system.2. In large solar
installations, especially those with long cable runs. Long cables
act as antennae and are more prone to induced voltage spikes from
lightning and utility grid switching. SPDs at the junction box
prevent these surges from entering the system.3. In solar systems
with a battery energy storage system. Batteries can be a source of
voltage spikes during charging and discharging, so SPDs protect
other components from surges originating from the battery bank.4.
Where frequent thunderstorms occur. In areas with heavy lightning
activity, voltage spikes caused by strikes nearby can enter a solar
system through long cable runs. SPDs provide surge protection at
the point where cables enter the junction box.The main purposes of
installing SPDs in a solar combiner box are:1. Protecting
inverters, charge controllers, and other electronics from damage
due to high-voltage spikes.2. Preventing interference with the
operation of the solar system. Voltage surges can disrupt the
functioning of inverters, charge controllers and monitoring
equipment.3. Reducing stress on and extending the lifetime of
wiring, inverters, batteries, and other components. Frequent surges
degrade equipment insulation and reduce operating life over time.4.
Improving the reliability of the solar system by avoiding
voltage-spike-induced faults and equipment downtime.5. Protecting
sensitive loads that are powered by the solar system. Any devices
powered by the solar system will benefit from the voltage
regulation provided by SPDs. /* January 22, 2024 19:08:37
*/!function(){function s(e,r){var
a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1
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