What size step down transformer do I need?
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.