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Surge Protection: How to choose the ideal DPS?


Surge Protection: How to choose the ideal DPS? : We live in a country that is a world leader in lightning. So it is essential that we use surge protectors that could damage our systems. And one of the best protectors on the market today is the DPS. A small device that helps prevent damage to the system due to electrical surges.

In this post, we talk more about DPS and everything you need to know before you buy one! Check out everything about him by reading this post.


DPS stands for  Surge Protection Device. Here on the blog, we already talked about these outbreaks,  so it’s worth a look! They protect the electrical system from power surges by diverting the surge to the ground so that the system does not suffer significant damage. They can be used to protect buildings, transformers, urban light fixtures, electricity distribution networks and others.


Before you find out what you need to know to choose your DPS, it is essential to know the importance it has for solar systems. A solar system is an electrical system, so it can also be damaged by outbreaks. And this happens regardless of whether your order is connected to the network or not.

So to make sure your system is undamaged and keeps going for a long time, it is interesting to install DPS for maximum protection of your solar generator.


There are a few points to keep in mind when choosing a DPS. Among them are their classes and their electrical characteristics, which are divided between voltages and discharge currents. This all you will check below.

DPS classes

Surge Protection Devices are divided into three categories. These classes vary according to the protection the site needs. Another essential thing is the DPS tests. They are tested with waveform currents that tell how long it takes a DPS to redirect the surge to ground. This time is usually measured in microseconds.

Class I –  They protect the system from the direct effects of lightning strikes. They are usually installed when the building is protected by a lightning arrester or Lightning Protection System (SPDA). They are tested with a 10 / 350μs waveform current, which is the equivalent of an electrical discharge.

Class II –  they protect against indirect effects caused by lightning strikes. Its test is done with a maximum discharge current that generates a waveform of 8 / 20μs.

Class III –  This type of class has thinner protection designed to protect only one piece of equipment. It is tested with a combined waveform of 12 / 50μs and 8 / 20μs.

Electrical Characteristics of a DPS

A DPS can also be defined by its electrical characteristics, which is the discharge voltage and current.

This is one of the first points to keep in mind when choosing your DPS. Check out more about each one below.


Nominal voltage: This is the electrical voltage required for proper operation of the DPS. The value of this voltage varies from manufacturer to manufacturer. It is the first voltage value you should know as it influences the next one.

Maximum operating voltage: This is the maximum that the DPS can handle without protection. This value is usually 10% of the nominal voltage. The maximum operating voltage must always be higher than the rated voltage. If it is smaller, the DPS will not operate as it should.

Residual Voltage: This is the voltage value that remains at the terminals of a DPS throughout its operation.
This is a very important value to check when buying a DPS, because the lower it is, the better the quality of the equipment.

Discharge Current

Rated Current: As well as the rated voltage, this is the current value required for proper operation of the DPS. It is defined from the tests that the DPS manufacturer has performed.

Maximum current: This is the maximum current that the DPS can discharge at least once without causing damage. The manufacturer also sets it.

With this information in hand, you’ll be able to make the right choice and protect your solar system from potential electrical surges!

And if you liked the post, you will also enjoy reading about  Charge Controllers, those responsible for protecting batteries in solar systems!


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