How to choose the appropriate power of the inverter?
It is necessary to take into account the peak power, i.e. the power required by a device at start-up, which is much more important than that used during normal operation. On each electrical device the rated power in Watts absorbed under 220 VAC is indicated.
If the peak power is not documented, a minimum multiplier factor of 3 must be applied to choose the most suitable inverter.
| Apparatus |
Size factor for inverter*
|
|---|---|
| Dishwasher, Washing machine | 3 |
| Sump, well or submersible pump | 3 |
| Boiler fan | 3 |
| Industrial motor | 3 |
| Portable heaters powered by Kerosene or Diesel | 3 |
| Circular saw, Bench grinder | 3 |
| Lighting | 3 |
| Cutting device | 3 |
| Microwave oven (when nominal output power is also cooking power) | 3 |
| Illuminating lights, stroboscope | 4 |
| Air compressor | 4 |
| Laser printer, Device using Quartz lamps for heating | 4 |
| Air conditioner, refrigerator, freezer (compressor) | 4 |
*Multiply the active rated power (Watts) of the device by this factor to find the continuous nominal power of the inverter to make it work.
The modified sine wave inverters are suitable for the majority of devices operating in 220 V. They will be able to supply the majority of equipment such as fans, lighting, pumps, microwave ovens, conventional portable electro equipment, etc.
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