It is very rare for a good quality LED driver to fail due to a manufacturing fault. In most cases, the failure is caused by an installation issue or there are some environmental factors at play.
The fact that there were two immediate failures on one installation indicates that there was an external cause of the power supply, which caused the failures. If you find yourself in this situation, the first thing to do is to look for a short in the output. There may be a shorted connection somewhere in the string that is causing the power supply to shut down.
As a quick test, disconnect the power from the light string and measure the voltage from the power supply. If it's OK, you know the problem is in your light string. You should also make sure that there are not too many lights at the output of the LED driver.
If you have previously installed only a few lights for some testing, you may mistakenly think that the LED driver can run the entire string of lights. Some LED strings have problems. Some of them have built-in electronics that compensate for the voltage drop, which can cause problems when starting from a cold start.
The light's built-in electronics will start operating at around 9V. This means that when you turn on the power and the output voltage of the LED driver reaches 9V, the string will start drawing current.
As the electronics compensate for the voltage, the string will try to draw more current to keep the light running at full power. For example, a 40W string at 24V draws 1.67A (40/24 = 1.67). However, at 9V, the current draw is 4.44A (40/9 = 4.44). This is too much current for your 40W LED driver, so it will not start the lamp. The answer is to use a higher power 12V LED driver that has enough current to provide a starting load for the lamp.
Are you using the right power supply?
1.) Determine the specifications of your LED lights
If you have a problem with your LED power supply, the first thing to do is determine the voltage and power specifications of your LED lighting products. products are compatible with each other. If you can't get the specifications from your supplier, then you can look at the product itself, which usually has some type of marking or sticker on it. If you do not know the wattage or voltage of the product, you will have to purchase an instrument to read it. It is also important to know if your product is a constant voltage or constant current LED.
2.) Determine Power Supply Specifications
After determining the specifications of the LED lamp, you can now check the specifications of the LED power supply to ensure that the input and output power is appropriate for your installation. Most LED power supplies will have this information printed somewhere on the product. This will cause your power supply to malfunction or flicker if you are driving over the speed limit or if the LEDs are using more wattage than the power supply is rated for.
If you have any questions about installing an LED driver, please feel free to contact us. A member of our expert team will be happy to answer any questions you may have.