Size the Transformer Around the Connected Load
The transformer is the power foundation of a low-voltage landscape-lighting system. Begin by listing the fixtures and lamp wattages that will be connected to each transformer. That total load, along with the layout and future expansion plans, helps determine which transformer capacity fits the project.
Total Light offers multiple capacities for smaller systems through larger multi-run installations. A larger transformer is not automatically better; the goal is to choose a unit that supports the planned load and gives the system a logical power layout.
Use Cable Layout and Output Taps Together
Wire gauge, run length, and connected load influence voltage at the fixtures. Multi-tap transformer options provide additional output choices that can be useful when managing more demanding runs. Plan the transformer and cable system together, and add compatible controls such as timers or photocells when automatic operation is desired.
Related guides: What Does a Low-Voltage Transformer Do? · Transformer Size Guide · Voltage Drop & Transformer Taps
Frequently Asked Questions
What size low-voltage transformer do I need?
Add the connected wattage of the lamps or fixtures that will be powered by the transformer, then choose a capacity appropriate for that load and the planned system layout. Consider future additions before finalizing the design.
What does a multi-tap landscape-lighting transformer do?
A multi-tap transformer provides more than one output-voltage option, which can help an installer manage voltage delivery on cable runs with different distances or demands.
Can one transformer power different types of landscape fixtures?
Yes, compatible low-voltage fixture types can share a transformer when the combined connected load, wiring, and system design are appropriate.
Why should transformer choice and wire gauge be planned together?
Transformer output, cable resistance, run length, and connected load all affect voltage at the fixtures. Planning them as one system helps avoid treating power capacity and wire selection as unrelated decisions.
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