Collection: Low Voltage Landscape Lighting Transformers | Silhouette Lights

Shop durable low voltage landscape lighting transformers at Silhouette Lights. Perfect for harsh Canadian weather. Expandable and energy-efficient solutions.

How to Select the Correct Transformer Size for Your Project

When choosing the correct transformer for your landscape lighting project, it’s important to consider both the total wattage of your lights and the length of the wire run. Use the table below to determine which transformer size is best suited for your setup.

Understanding the Table

The table shows the maximum wattage that each transformer can handle based on different wire run lengths. Follow these steps to select the appropriate transformer:

1. Determine your wire run length: Measure the distance from your transformer to the farthest light in your setup. This is your wire run length.
2. Calculate total wattage: Add up the wattage of all the lights connected to that wire run.
3. Find your wire run length in the table: Look for the row that corresponds to your wire run length (e.g., 15m, 30m, etc.).
4. Check the maximum wattage: In that row, find the column for each transformer size (75W, 100W, 150W, or 300W). The number in each cell represents the maximum wattage that transformer can handle for that specific wire run length.
5. Select a transformer: Choose a transformer with a maximum wattage higher than or equal to your total light wattage for that wire run length.

Example

If you have a 30m (100') wire run and a total light wattage of 70 watts:

• In the row for 30m (100'), check each transformer size.
• The 75W transformer can handle up to 37 watts.
• The 100W transformer can handle up to 74 watts.
• The 150W transformer can handle up to 112 watts.
• The 300W transformer can handle up to 150 watts.

Since your total wattage is 70 watts, you would need at least a 100W transformer, as it can handle up to 74 watts on a 30m (100') wire run.