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Projoy Successively Launched PEFS-EL Series String and Panel Level Rapid Shutdown Solution

Published on 7 Sep 2021
ProJoy Electric 
In a photovoltaic power station, as long as there is light illuminating the solar panel, a voltage of 600~1500V will be generated on the DC side. Although the built-in DC isolator switch in the inverter can cut off the DC power of the inverter, it cannot do anything about the DC power between the solar panel and the inverter.

In the long-term operation of a photovoltaic power station, problems such as poor contact caused by unfastened joints, quality problems of contacts, and aging of insulation parts will directly lead to DC arc phenomena. Unlike the AC arc, the DC arc does not have a zero-crossing point, which means that if a DC arc occurs, the trigger part will maintain stable combustion for a long time without extinguishing. The high temperature generated by the DC arc can be as high as 3000 ℃, which can directly cause fire. Even if the probability of a DC arc is only 1/1000, a 10MW power station will have 80 times DC arc events during its 25-year power station operation time.

Therefore, with the global popularity of photovoltaic power plants, how to prevent the fire risk of photovoltaic facilities and how to ensure that non-professionals identify and cut off the risk in the first time have become a matter of widespread concern in the photovoltaic industry. 

Countries respond to the safety standards of photovoltaic DC high voltage

At present, in developed countries such as the United States, Europe countries, Japan, Australia, etc., compulsory measures have been introduced against the DC high voltage problem in photovoltaic systems.

Based on market demand, Projoy has successively launched PEFS-EL series string level rapid shutdown solution and PEFS-PL series panel level rapid shutdown solution.



Projoy's PEFS-EL string level rapid shutdown solution

Projoy's PEFS-EL series rapid shutdown, 1-2 strings, 3-6 strings and 7-12 strings products can be respectively applied to residential, industrial and commercial or large-scale photovoltaic systems. The maximum loop voltage can reach to 1500V. The built-in advanced temperature sensor can detect the temperature in the shell in real time. When the internal temperature exceeds 70°C, the switch is automatically cut off. In the event of a fire, firefighters can first turn off the AC power. At this time, Projoy's PEFS-EL series can quickly shut down the signal collected from the power grid. The disconnection switch will be automatically turned off if the power failure time exceeds 5s, and then the DC power will be cut off.



Features:

• The max. loop voltage is 1500Vdc, the max. loop current is 55A, and 2-12 strings loop can be shut down

• Casting plastic shell is optional, IP65 protection level

• Active control, safe and reliable

• Fire and flame retardant grade UL94-V0 / anti-UV material

• High-quality materials, improve the high temperature resistance, corrosion resistance and impact resistance of the product

• External slide block mounting hole design, easy, convenient, efficient and stable to install

• DC interface has knock-out holes, glands, MC4 optional

• Built-in ventilate valve to avoid condensation in the cavity

• Built-in isolator switch with TUV, CE, CB, SAA, UL certification

Porjoy PEFS-PL panel level rapid shutdown solution

Projoy's PEFS-PL series rapid shutdown is a device that can realize panel level quick shut down, and each device can serve 1 or 2 panels. When Projoy’s PEFS-PL is installed in the photovoltaic systems, each panel can be left open. In an emergency, the AC switch or quick-off button can be used to quickly shut down the panels, to ensure the personnel safety of the system or firefighters.



Features:

• Lightweight design, buckle installation, simple and convenient, perfect matching panel installation;

• Meet UL, NEC NEC 2017/2020 (690.12) , SUNSPEC agreement

• Match LVRT feature of the inverter.

• PLC control / DC24V power control optional

• One for one, one for two optional

• White / orange / black colors are available

• Built-in temperature sensor, automatically shut down when over 85℃;

• Fire and flame retardant grade UL94-V0 / anti-UV material / IP67 protection grade

• High-quality materials, improve the high temperature resistance, corrosion resistance and impact resistance of the product

• Automatic reset function, it can automatically close after power is restored, no need manual reset.


Source: Projoy
ENF Profiles For Companies Mentioned in This Article

ProJoy Electric (Solar Components): https://www.enfsolar.com/projoy-electric
ProJoy Electric (Solar Materials): https://www.enfsolar.com/projoy-electric
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