5 Steps On How to Flash a Generator with a Battery

For a generator to start, it must be generated by electricity.  One of the reasons for a portable generator not to start is the lack of residual magnetism. A portable generator works when moving electrical conductors through a magnetic field. Your generator lacks magnets. And when there is no residual magnetism, the generator has no power to start running. Therefore, learning on how to flash a generator with a battery is important.

You will have to give energy to your generator for it to start. In his case, the battery works all the time for it produces high voltage for distributing enough current to start your generator.

What Does Flashing a Generator Mean?

It is normal for your generator to stop working after running for a certain period. This is maybe caused by a low electrical or mechanical energy supply. In such a case, you will need a method to pass energy to your generator for it to start.

Flashing a generator simply means starting a generator after an abrupt stop. You can flash it by applying electrical and mechanical input by using a battery. For a large generator, batteries of 12.4 to 12.8 volts are constant enough to run it. When it comes to small a generator, you can use a quadrant driller or low voltage battery to start it.

Use your hands to revolve the chuck of the driller in a reverse way, then pass the converted electrical energy to the input lot of the generator. This process is quite mechanical, you can only use it to flash a small generator.

How to Flash a Generator with a Battery?

To reestablish the limited volume of moping magnet important to start voltage development, affiliate a 12-volt battery to the inciter field while the generator is veritably still, as follows:

1. Exclude inciter field drives F and F-from the voltage regulator. Alert Failure to exclude the area leads from the regulator during glistering methodology may crush the regulator.

The causer area inhibition needs a mensuration ranging from positive to negative end of the lead. For pursuing the option, you need to face some obstacles as you’re estimating a patient winding. The endless opposition perusing will demonstrate the opening of the causer area. Likewise, check to make sure there’s no way to base.

2. Associate F to the positive post of the battery.

3. Take the negative lead for some time through the defended part of its line and also communicate the negative lead to the opposing shaft. Do this for five to ten seconds.

4. Reconnect F and F-to the regulator. Tutor the strategy if the generator neglects to fabricate voltage.

5. After following the below way, you can now flash your generator using a battery. Remember to use a high voltage battery to induce enough electric power for your generator.


How to Start a Brushless Generator

A brushless electric generator depend on remaining attraction in the rotor to start creating voltage in the stator. Immediately that happens, a slight current flows from the stator into a field winding to prompt full power. Once in a while, a creator loses the remaining attraction and fails to start producing power.

This is most likely to happen when the creator is not used for an extended period or if the stoner locks it down under cargo. The generator custom shops use a distinct tool to flash the field of an a non-functioning generator. You can do it yourself using the tools you may previously have.

Keep a fitting clutch and then discharge the switches. The drills could harm you if they screw out of your hands.

  1. Put on the generator. Look at the combers of the circuit. Change them if they’re tripped.
  2. Fit the sword bar into the wedge of the drill then strain the wedge.
  3. Fix the other end of the sword rod with the drill with no cord. Strain the wedge.
  4. Connect the corded drill into the generator. Make sure the two drills are ready for forwarding gyration.
  5. Hold the two drills firmly then press the detector button of the corded drill. Pressing the detector button of the cordless drill is to spin the wedge of the corded drill.

The banded drill performs as a minor generator to pass current into the windings of the larger generator so as to fascinate the field thereafter forcing it to start running. After this process, the corded drill will start combating the cordless drill.

Why You Need to Flash a Generator

How to Flash a Generator with a Battery

Generators don’t have a magnetic field. For a generator to run, the generator has to use a magnetic field to push away the electrical conductors. For this reason, you have to connect the generator yield voltage with a DC for it to become magnetic.

After your generator has run for quite a while, a small amount of magnetism commonly known as residual magnetism will be formed. This energy will be able to supply a partial amount of power that will make a more constant electromagnet. Immediately the stator winding receives an electric field, the more sturdy your generator will be.

Once the lingering attraction is lost, the generator will have no force to run. When your generator has not been used for a long time, it might be the load’s activities on your generator that cause the left magnetism to be lost. Your generator should work continuously to keep the magnetism towards the load.

Always remember to turn the switch off before shutting down the generator to disconnect the load. If you shut down the generator when the load is still in action, the electromagnets will get demagnetized.  Remember to have enough fuel just for an emergency.


Frequently Asked Question

How Do You Remagnetize a Portable Generator?

1. Stop the generator engine from running.

2. Plug the electric drill in the generator output.

3. Start the generator’s motor and let it run for a while

4. Request someone to help you hold the battery drill as you hold the electric drill

How would you Get a Generator to Work When It has Lost its Residual Magnetism?

A generator has no magnet and can’t form a magnetic field if the residual magnetism is lost. When supplying the field coil with an electric current, it will supply a magnetic field to start the alternator and build the required magnetic field.

Can you Start a Generator with a Car Battery?

A car battery can start a portable generator since it has enough voltage.

How do you test a generator output?

You can test your portable generator’s output using a hand-held voltmeter. Put on the voltmeter and turn the selector to the “AC Voltage” position. Using the voltmeter to check AC voltage while in any other mode will blow the meter’s fuse.

How does a Self Excited Generator Works?

When it comes to self-excited generators, a small quantity of magnetism is available in the rotor. The residual magnetic field of the main poles persuaded an electromotive force in the stator coils, which produces the first current in the field windings.

An increase in the magnetic field will occur due to inadequate current in the coil. This will cause the voltage output to increase, hence, increasing the energy.  Due to the flow of small current in the coil, an increase in the magnetic field occurs. As a result, voltage output increases, which in turn, increases the field. The process will go on until the poles are saturated. The struggle of the field winding has a certain stable charge, at which self-excitation can be achieved. This resistance charge may differ according to the electric bounds of the generator.

How to Acclimate a Movable generator to the Proper Voltage

Detect the voltage dial on the movable generator.

Acclimate the throttle of the generator to increase or drop the RPMs of the machine’s motor.

Corroborate the voltage affair with a voltmeter whenever you’re conforming the voltage affair on a movable generator, indeed one with a voltage dial.

Which Type of Generator Must be Self Excited?

Types of DC generators:

Compound DC generators

Combination wound generators

Shunt-wound DC generators

Series wound generators


I hope the steps mentioned above will help you know how to flash your generator with a battery. I’m sure you now know and understand how a battery works to give enough quantity of electricity. I know from this point you are confident at all times to start running your generator correctly.


About Steve Stuart

Steve Stuart is an electrical engineer who developed interest on generators during his school years. After school, he became a generator enthusiast. This is after encountering power supply problems at the area of residence where he lived. Power would be on and off and so food would go bad and the room heater would go off especially during winter. After trying the different generator brands for several years, Steve now provides information on the available brands and products in the market today. Based on his experience, he gives the do’s and the don’ts when it comes to generator use.

Leave a Comment