What Causes Low Voltage in a Diesel Generator and How Can It Be Fixed?

The role of the diesel generator is to produce a constant flow of electricity in case the main power system is out of order. Sometimes, the generator produces low voltage. This may lead to different issues with the equipment connected to the generator. It is necessary to learn the causes of low voltage of the generator.

1. Overload

This is one of the main reasons why the generator produces low voltage. If the generator is overloaded with a lot of appliances or equipment, then it cannot provide all of its voltage.

See how much load you have connected to your generator. Check if it fits the capacity of your generator. If there is an overload of the load, then eliminate some of them.

2. Defective Automatic Voltage Regulator

Automatic Voltage Regulator regulates the voltage being produced by the generator. Should there be any issues with the AVR or should it fail to function effectively, then there will be an irregular voltage production.

It is wise to seek the advice of a professional on that matter.

3. Slow Engine Speed

The voltage of the generator depends on the speed of the operation of the alternator. If the engine is working slower than the required speed, there might be an issue with the production of electricity.

The slow speed of the engine is caused by fuel, governor, engine problem, and overload. The speed of the engine should be checked with the help of special instruments.

4. Fuel System Failure

If the generator is not functioning well because of the lack of fuel in the generator, there might be problems in the performance of the engine. This can happen because of clogged fuel filters, bad diesel, blocked fuel line, or broken fuel pump.

It is necessary to examine the fuel system and replace the filters in case of any problems.

5. Alternator Problems

Alternator is used for conversion of mechanical energy generated by the diesel engine to electrical energy. The malfunctioning of the alternator windings, brushes, slip rings, etc., can lead to low voltage.

In case the problem cannot be found after checking the basic things, it is recommended to have the alternator checked by a skilled technician.

6. Loose or Faulty Electrical Connections

Loose connections, damaged wires, corroded connections, or faulty electrical connections will cause low voltage between the generator and the devices connected to it.

It is necessary to inspect the electrical connections carefully and repair them where required. The electrical connection must be done by a professional.

7. Maladjusted Generator Settings

Some generator voltages and frequencies are meant to match the voltages and frequencies of the electrical devices they will supply, and failure to adjust them results in an irregular production.

Check your generator’s settings following the specified guidelines.

How Do You Fix the Issue with Low Generator Voltage?

This all depends on the reason behind the issue. First of all, you need to check the load, engine speed, fuel, electrical connection, and the generator. If there are constant issues, you need an expert opinion regarding AVR and alternator.

Raising the voltage without knowing the source of the problem can result in damage both to the generator and the equipment connected to it.

The reasons for low voltage in a diesel generator include a heavy load, AVR issue, low engine speed, fuel issue, alternator issue, loose connections, and improper settings.

Proper service and proper management of load and settings will help you avoid any voltage issues in the future.