Which Transformer Do I Need?

Here’s how to work out what transformer is most suitable if your transformer needs replacing.

One watt is equal to one VA. This means that the VA rating on your transformer must be equal to or greater than the wattage of the components it powers.

Most people use a transformer to power their pump and lights. If this is the case, you would simply need to add the wattage of your pump and lights together and this would give you the VA rating required.

The wattage of your pump can normally be found on the pump label.

Lights are 5 watts for a halogen pencil light and 2 watts for and LED light.

Example 1

If your pump is 10 watts and you have 2 x LED lights, this would equal 14 watts. You would therefore need a transformer with a rating of 14VA or more.

10 watts (pump) + 2 watts (light) + 2 watts (light) = 14 watts

Example 2

If you had a 12 watt pump and 1 x halogen light, this would equal 17 watts. You would therefore need a transformer with a VA rating of 17VA or more.

12 watts (pump) + 5 watts (light) = 17 watts

How do I know what lights I have?

Halogen lights have a domed shape and look very similar to a test tube. These are 5 watts.

LED lights have a very tiny bulb with no cover. They often come in a ring shape that looks similar to a donut. These are 2 watts.

Here is a list of the transformers that we sell.

If you purchase a smaller transformer, it would put a strain on the electrical components and burn out the system.

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