# What size transformer do I need for my landscape lights?

Table of Contents

## What size transformer do I need for my landscape lights?

Small Landscape Lighting Design Plan Power Calculations So, if you want to connect ten landscape spotlights to a small transformer, and the lights utilize 2W / 4VA / 20 watts halogen equivalent light output power each, you would want a 100-watt transformer. (Example of calculations: 10 lights X 4 VA = 40 voltage amps).

**What transformer is needed for low voltage lighting?**

Transformers generally range from 150- to 900-watt capacity. Matching the size of the transformer to the lighting design is important for efficient operation and function of the system. House current, 120 volts, is reduced by a transformer to 12 to 20 volts, the current needed to operate low-voltage landscaping lights.

### How big a transformer do I need?

To determine the required transformer VA, multiply the secondary voltage by the required amperes: For example, VA=Volts x Amperes or 28V x 1.2 amperes = 33.6 VA. To determine the maximum transformer current, divide the transformer VA by transformer secondary voltage.

**How do you size a 12V transformer?**

Compare your total lamp wattage to the available transformer sizes (typically 300, 600, 900 and 1200W). If you add up 600 watts, then use a 900-watt transformer. By code, transformers should be derated to 80% of their capacities so a 900W unit should be derated to 720W max (900 x . 8).

#### How do I choose a replacement transformer?

- Step 1: Determine the KVA, Amperes or wattage required by the load. Determine the KVA, Amperes or wattage required by the load.
- Step 2: Find out the supply voltage.
- Step 3: Determine the voltage required by the load.
- Step 4: What is the frequency of the supply source?
- Step 5: Determine the Marcus transformer model number.

**How many lights can I put on a 300 watt transformer?**

(10 lights X 30 watts = 300 watts, and 300 is 80% of 375).

## What size transformer do I need for 12v LED lights?

To decide how much power your LED strip driver needs, multiply the length of LED tape you have (in metres) by the wattage per metre. For exampleâ€¦ This means you will need an LED transformer that can supply 35 watts (at least).

**What size transformer do I need for 12V LED lights?**

### What transformer do I need for LED lights?

This means that LED drivers are the power supply of choice for small LED lighting setups in the home, as individual LEDs may only require 2V – 4V DC. When LEDs are connected in a series – or ‘array’ – a much higher voltage is required. In this case, an LED transformer may be installed (e.g. to power a light strip).

**Are all low voltage transformers the same?**

There are two versions of low voltage transformers, single-tap transformers (where all outlet taps are of the same voltage, 12V or 24V) or multi-tap transformers (which include multi voltage outlet taps like 12v, 13v, 14v,15v, 16v etc).

#### How many lights can you put on a 150w transformer?

A 150 watt transformer can only support up to 150 watts of lamps. This means the most you could add onto this transformer would be 140 watts, or 7 halogen lamps. However, putting 140 watts of power onto a 150 watt transformer is really pushing it to its limits.

**What happens if a transformer is overloaded?**

The weakening of the system will happen faster if the transformer is frequently overloaded. The net result of small, incremental increases in loading capacity over time is a weakened insulation system. Overloading causes overheating, and eventually thermal degradation that acts thrrough cracks in the insulation.

## How many lights does a 300w transformer need?

**Can I use any transformer for LED lights?**

LED drivers and electronic transformers for retrofit LED lighting are not interchangeable. They differ in output and load compatibility i.e. which LED lights they will work with. The fundamental difference between the two is that LED drivers output DC while electronic halogen transformers output 12VAC.

### Why do lighting transformers fail?

Usually, a transformer fails only after another part in the electrical circuit shorts to ground or draws an unusually high amperage. In these cases, replacing the transformer without first finding and correcting the fault will only cause the transformer to fail again.

**What happens if transformer is overloaded?**