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1. Inverter or AVR?


The Inverter technology allows to regulate the output voltage of the generator with a margin of ± 1.5%.

Inverter generators are therefore perfectly suited for sensitive devices (televisions, smartphones, computers, etc...).

The inverter also allows to save fuel:

The generator adapts the engine speed according to the needs of your devices, the consumption is therefore reduced if the group is not at full load.

However, be careful to deactivate the eco mode (engine speed regulation) if you use rotating tools (drill, grinder, etc...).


The AVR (automatic voltage regulation) technology allows to regulate the output voltage of the generator set.

There is no standard concerning the variation margin, so be careful with the value given by the manufacturer.

Some AVR generators have a voltage margin of 5% (Hyundai, Feider, etc...). Others have a margin of 1.5% just like the Inverter (Konner & Sohnen, Kompak, FOGO, etc...).

2. Which fuel ?


The gasoline generators are made to work in a punctual way.

They are ideal for motor homes or as emergency power in case of infrequent power cuts.

They are also suitable for construction sites where they will not need to run continuously throughout the day.

However, there are some exceptions: some gasoline FOGO units have been designed to run for 48 hours at a time.


There are two types of diesel generators.

The 3000 rpm: they are made to run for long periods in a row (10 to 12 hours). They are therefore perfectly adapted for regular and long power cuts. They are also adapted to work on building sites where the group needs to be in operation all day long.

The 1500 rpm : they are made to work for 24 hours in a row. They can therefore be used as the main power source for a house or other.


Gas powered generators can be used in the same way as gasoline powered generators.

The advantage of this fuel is that it reduces consumption and therefore saves money. The emissions are also lower.

3. Single or three phase?

Single phase

Single-phase generators deliver a voltage of 230V. A single-phase 16A outlet can deliver a maximum of 3680W.

If the power of your generator is higher and you want to use all the power for one appliance, you will have to use a 32A socket.

Three phase

The three-phase generators deliver a voltage of 380V. They are therefore generally suitable for professional appliances.

You will regularly find single-phase plugs on three-phase generators. Be careful, they deliver only one third of the total power of the group since they use only one of the three phases.

There are however some exceptions, some generators (Kompak, Konner & Sohnen, etc...) deliver the same power in single phase and in three phase, but never at the same time. There is a selector that allows to switch from 230V to 380V. When a unit has this feature, it is systematically indicated in the technical data sheet.

4. What is the difference between maximum and nominal power?

The maximum power is the "peak" that the generator is able to support when starting an appliance for a few seconds.

The rated power is the power delivered continuously by the generator set.

Some generators equipped with professional generators (Linz, etc...) and professional engines (Honda, Vanguard, etc...) are able to provide a starting power of 300%.

5. Which power to choose?

The power needed depends on the appliances you intend to use.

To power a house, you generally need 4000W to 6000W.

Take into account that many appliances need more power to start.

For example, a 1200W pressure washer needs 4800W to start, as it has a starting coefficient of 4.

We invite you to consult our table below: