Build your own 12V DC Engine Generator

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8 Affordable DIY Generators The Utility Companies Absolutely Hate

Notice: Inverters are not free energy devices. If you want free electrical energy, you will need to purchase and build our Fuelless Engine and our SP generator. We do this by electronic switching or we use our new mechanical can oil filled canister type commutator design.

All you need is to use is a high efficient electric motor that runs in the milliamps to turn the commutator switching shaft, the oil in the can will keep the commutator from sparking! You can even convert an old DC motor from an auto junk yard, rewire it and fill it with oil just as well. You can adjust the speed of the motor to get the desired 60 Hz or any Hz you desire. If you ever wanted to build your own inverter, then you should get these plans.

Packed with information you may not find any where else! Free updates are included with the purchase of these plans. See the many new approaches we have discovered in making an easy to build homemade inverter! Can be used as a modified sign wave or a possible pure sine wave inverter, if you allow the DC to be pulsed into a large transformer and choke.

You won't be able to get these critical items post-collapse.

If your RE sources are not powerful enough, or flexible enough, to equalize the battery, then this engine-driven source can do the job. Power Source Control Energy sources which recharge batteries need to be controlled. If the charging source is not controlled, then the batteries may be overcharged or recharged too rapidly.

The most common method of control is voltage regulation. This works fine in cars and in batteries with shallow cycle, float service.


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Voltage regulation alone is not enough for deeply cycled batteries. They must also be current regulated to prevent too rapid recharging.

Voltage Regulation Voltage regulation only is OK for batteries that are very shallowly cycled. In shallow cycle service the battery refills almost immediately since it has only had a small amount of its stored energy removed. If deep cycle batteries are recharged from a source that is voltage regulated, they will be charged at the total output current of the source as it struggles to bring the batteries immediately to the set voltage limit. If the charging source has say 55 Amperes available, then it will charge the batteries at this 55 Ampere rate.

Where does electricity come from?

The 55 Amperes from the source would recharge the Ampere-hour battery at a rate over five times faster than it should be charged. This will result in premature battery failure, higher operating costs, and much lower system efficiency.

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The voltage of the batteries is left unregulated until the batteries are full. Constant current charging assures that the batteries are not charged too rapidly. To prevent electricity from flowing the wrong way, I inserted a diode between the motor and the battery. A diode directs a current in only one direction, from the anode to the cathode; in my circuit, the anode faced the positive terminal of the motor, while the cathode faced the battery's positive terminal.

Generators & Dynamos

I wrapped the ends of the diode around the motor's exposed wire and an alligator-clip-tipped test lead, which fastens to the battery, and insulated the connections with electrical tape. Then I wired the motor's negative lead directly to the negative terminal of the battery. Ideally, the battery should be kept charged above 50 percent, but to prevent corroding it, don't continue to give it electricity after it's fully charged.

To keep an eye on this I hooked up a multimeter to the battery terminals. Be careful to set the multimeter to the correct measurement—12 volts in the DC range though, if that's not available, choose the next number higher than I overlooked the setting on my first ride and the multimeter went up in smoke. I also used a multimeter to monitor how hard I needed to pedal.

To charge the battery I wanted the generator to put out 13 to By keeping my eye on the multimeter as I rode, I was able to get a good feel for this. In retrospect, it would have been worth it to buy a voltage regulator so I could pedal as hard as I wanted without feeding too much voltage into the battery. The final step was to connect the leads from the inverter to the battery.


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When choosing an inverter, make sure it can handle the maximum peak load you're anticipating. Loads are measured in watts, which is a unit of power.

Follow the steps below:

Since I wasn't planning to do anything more strenuous than run a watt lamp, I bought an inverter rated for just watts. When it was all assembled, I pedaled my bike and the current flowed. Even better, if I had a few batteries on hand whose charge I monitored monthly, I could store up enough energy to power small electronics during a power outage. And, yes, the generator did make indoor bike riding fun. After a while, however, the rig made my apartment feel pretty cramped, especially since I already had two other bikes.