# What size step down transformer do I need?

**need**a

**step**-

**down**voltage

**transformer**if you're traveling to any country with a power standard that is higher than what your appliances use. Conversely, taking appliances that run on 220–110 volts to the U.S. or Canada requires a

**step**-up voltage

**converter**that can transform 110–120 volts up to 220–240 volts.

Then, how do you size a step down transformer?

A 120-volt motor has a load amperage of 5 amps. Multiply 120 volts times 5 amps this equals 600VA now lets multiply the 125 percent start factor. Take 600 times 1.25 this equals 720VA and most **transformers** are sized by a factor of 25VA or 50VA. The required **transformer** would be a 750VA or .

One may also ask, how many watt transformer do I need? Example: If your appliance consumes 80 **Watts** then you **need** a AC-100 **transformer** (100 **Watts** capacity) or higher. If you **want** to operate 2 appliances on one **transformer**. One of them consumes 300 **Watts** and the other 130 **Watts** then you **would need** a AC-500 (500 **Watts** capacity) or higher.

Besides, how big a transformer do I need?

Once your landscape lighting design is complete, you can figure out **what size** of low-voltage **transformer** you **need**. **Transformers** generally range from 150- to 900-watt capacity. For example, if you plan to use 20 12-watt lights, multiply 12 times 20 for the total wattage. In this example, the total wattage is 240.

How do I choose a transformer?

**Before Selecting a dry-type Transformer**

- Determine is it three phase or single phase.
- Determine power line voltage and frequency it will be primary voltage for your transformer.
- Determine voltage for your application it will be secondary voltage of the transformer.
- To determine the capacity required in volt-amperes.