What are the differences between single-phase and three-phase generators?

The single-phase generator is widely used in homes and household appliances that use single-phase voltage. In our day-to-day life, many of the equipment we use are powered by single-phase power. On the other hand, larger equipment, such as industrial equipment, as well as most generators, uses three-phase energy to ensure adequate power supply.

Single-Phase Generator vs. Three-Phase Generator

  • The choice of a single-phase or three-phase generator will depend on what you want to connect, so you can choose a single-phase current (220 volts) or a three-phase current (220 or 380 volts);
  • A single-phase generator is a suitable choice for equipment with low power consumption;
  • You should opt for a three-phase generator for appliances with high-power motors, which are also three-phase;
  • Three-phase generators have smaller dimensions and lower weight compared to single-phase generators, because they use their windings more efficiently;
  • For energy distribution, over long distances a three-phase power system is most advisable. Thus, it will ensure that, for example, large industrial equipment operate more effectively.


If you have a generator, you should be careful about it’s use and maintenance for it’s correct performance and good performance. Therefore, after using it, make sure to pack it in a suitable place, and if possible place it on wedges.

If you are not going to use it for about a month or more, you should clean the engine as well as drain the fuel tank to avoid damaging the generator.

Regardless, if it is a single-phase or three-phase generator it is very important that you have a correct use of it and if you want to acquire a generator, always keep in mind what kind of use it will have.

If you have any questions about the generator to use, contact us.

Grupos electrogéneos Grupel+Grupel - Energia de Portugal para o Mundo