Instructions: Fill in the HP of the motor(s) in their starting sequence, select the start method (DOL - Direct On Line or Star Delta) and press Calculate.
* Please NOTE the above calculations are an estimate only because other factors such as site conditions, motor efficiencies, and iron losses are not taken into consideration.
| Appliance | Rated Watts (Appliances) |
Rated kVA (To operate appliance) |
Rated kVA (To start appliance) |
|---|---|---|---|
| Air Conditioner (Evaporative model) | 275–1000 | 0.34–1.25 | 1.36–5 |
| Air Conditioner (Reverse cycle) | 200–2500 | 0.25–3.13 | 1–12.5 |
| Clothes Dryer | 2400 | 3 | 3 |
| Coffee Percolator | 550 | 0.69 | 0.69 |
| Can Opener | 100 | 0.13 | 0.52 |
| Deep Freezer | 500 | 0.63 | 2.52 |
| Disposal Unit | 650 | 0.81 | 3.24 |
| Dishwasher | 1000–3000 | 1.25–3.75 | 1.25–3.75 |
| Domestic Water Pumps | 275–1000 | 0.34–1.25 | 1.36–5 |
| Exhaust Fan | 40 | 0.05 | 0.2 |
| Food Processor | 500 | 0.63 | 2.52 |
| Floor Polisher | 350 | 0.44 | 1.76 |
| Frypan | 1400 | 1.75 | 1.75 |
| Hair Dryer | 1500 | 1.88 | 1.68 |
| Hotwater Service | 2500–3000 | 3.13–3.75 | 3–13.75 |
| Iron | 800–1500 | 1–1.88 | 1–1.86 |
| Kettle or Jug | 1600–3000 | 2–3.75 | 2–3.75 |
| Lights | 25–200 | 0.03–0.25 | 0.03–0.25 |
| Microwave | 1500 | 1.88 | 1.88 |
| Oven | 4000–8000 | 5–10 | 5–10 |
| Radio | 60 | 0.08 | 0.06 |
| Radiator | 1000–2500 | 1.25–3.13 | 1.15–3.13 |
| Refrigerator (home) | 300 | 0.38 | 1.52 |
| Sewing Machine | 60 | 0.08 | 0.32 |
| Space Heater | 2000 | 2–5 | 2.5 |
| Television | 75–200 | 0.09–0.25 | 0.09–0.25 |
| Toaster | 250–1250 | 0.3–1.56 | 0.3–1.56 |
| Washing Machine | 500–6000 | 6.33–3.75 | 2.52–15 |
| Welder 140A | 5000 | 6.25 | 8 min |
Inductive loads (typically electric motors, electric pumps, electric compressors and air conditioners) require 6–8 times more current to start than to run. Most generators can provide 100% overload for start up purposes. A 1 Hp electric motor therefore will require 3–4kVA for start up. Once the 1 Hp electric motor has started, it will only consume 1 kVA leaving a extra 2–3kVA available for other appliances.
However, the newer 'Inverter' style generators may be more efficient and capable of starting higher loads.
