Why Can’t I Parallel two Dissimilar Inverted Generators Together


When it comes to wanting to parallel two inverted generators together, people generally use the generator of the same size and make.

This rules out the chances of any compatibility issue.

This doesn’t suggest that it isn’t possible to parallel two different generators.

On the contrary, it is quite common to run two generators and utilize their combined power.

However, there are certain limitations that you need to consider. If you don’t bother with these aspects, it won’t be safe to parallel two dissimilar inverted generators.

Limitations and Safety Risks

No doubt, generators with similar power and brand can be easily paralleled. This is possible as both these generators have similar frequency and voltage levels.

If you want to connect two different inverter generators, it is essential to analyze their compatibility, load sharing control systems, the performance of alternators, and their interfaces.

1. Compatibility of the Two Engines

Concerning running two dissimilar inverter generators in parallel, the most crucial aspect is their engine capacity. This capacity of each engine is mentioned in kilowatts (kW).

The recommended and safest way is to run the generators with the same kW. It would help to prevent the issue of overload.

It would be unsafe for your equipment if both the generators differ in terms of their engine compatibility.

2. Compatibility of the Alternator

Another factor to consider is the compatibility of the alternators. If the alternators of both the generators are different, it may cause damage to your equipment by producing disrupted currents.

Besides, this mismatch in frequencies can also prove to be detrimental for the relays. Furthermore, it can overload the distribution system as well as the generators.

3. Compatibility Load Sharing Control System

After connecting the two dissimilar generators, make sure that the frequency and voltage produced are similar. In the case of dissimilar generators, the control system can’t monitor the bus voltage.

As a result, the load will be shared among both the generators in an uneven manner. This may cause one of the generators to experience overload.

4. Compatibility of the Interface

When running the two dissimilar generators in parallel, it is essential to allow them to communicate with each other.

This requires interaction between the external monitoring system and master control.

How to Compensating for Dissimilar Alternators

When you need to parallel two dissimilar generators, you can choose some viable options to deal with the expected problems.

Typically, it depends on the performance of the alternators and their voltage harmonics.

The generators with different kVA ratings should be arranged in a way that they are on the same pitch.

Moreover, you can replace the alternator to resolve most of the issues.


Usually, it is safe to parallel similar generators if you are following the instructions of the manufacturer.

However, if you are thinking about paralleling two different generators, it’s a risky business.

This is because both the generators aren’t compatible with each other.

This leads to the issues associated with the voltage difference, which may prove detrimental to your equipment.

About Richard Allen

Richard is a senior writer at Mechanicology and has an overall experience of 15 years in writing on power, gadgets, and electronic appliances related topics. He holds a degree in electronics engineering.