How to Make a Portable 400 Watt Generator with a Solar Panel Power Inverter

This article will give you the step-by-step instructions on how to make a 400 watt portable generator with a solar panel power inverter.

What You’ll Need

To make a DIY portable generator you’ll need the following things:

  • A motor, either electric or internal combustion
  • A gearbox to change the speed of the motor
  • A small gasoline or diesel engine, or an electric motor and gearbox combination
  • A solar panel to generate electricity on a sunny day
  • A large capacitor to store electricity for use on a cloudy day
  • A high-power dry-cell battery to store electricity for use on a cloudy day
  • An inverter to change the direct current (DC) from the solar panel into alternating current (AC) that the motor can use
  • An extension cord to tie everything together
  • An airtight container for storing the generator when it’s not in use

How to Make It Work

The key to this generator is the solar panel and large capacitor which are responsible for storing energy during the day. When the sun shines bright and the air is still, the solar panel will generate plenty of electricity which can be stored in the large capacitor. When the sun starts to go down and the wind picks up, the stored electricity will be used to power the engine and the gearbox. As the speed of the engine and gearbox increase, so does the power output. When the stored electricity in the capacitor gets low, the user has to stop what they’re doing and manually switch the power source to the high-power batteries to ensure that they continue producing electricity while the engine is still running. This is when the generator is most useful because it allows you to keep producing electricity even when the power from the grid goes down. If a power outage occurs during the day, the user can switch to their own stored energy and continue working until it’s time for them to stop for the day. In an emergency situation or during a long power outage, this type of generator could prove to be quite valuable.

Construction Techniques

Make sure that you follow all the safety precautions when working with electricity. Make sure that all the surfaces where you’re cutting are insulated from the ground and that there are no bare metal surfaces or places where electricity could touch or cause damage to anything. When working with tools that have a high voltage, make sure that you wear protective eye gear and hearing protection.

Making a 400 watt portable generator isn’t too complicated, but rather tedious and exacting. You’ll need to take the time to ensure that everything is cut precisely according to the measurements and that the materials are of good quality. In terms of quality, it’s important to get the right size and shape while also considering weight and balance. After you’ve gotten everything planned and measured, it’s time to move into action. The whole construction process will take you about a week to complete.

To start, you’ll need to cut a piece of wood to the shape and size of the container that you’ll use for this generator. You’ll then need to reinforce the area around the lid where it meets the base with metal straps and lock the lid in place using heavy-duty lock washers and nuts. You’ll want to make sure that the container is airtight and waterproof. It should be strong enough to hold all the weight of the equipment inside while being sturdy enough to withstand the elements. A good-quality sealant will also be required to fill in any gaps and keep out all the weather elements.


The most important thing to keep in mind is how to operate this generator safely. Never start a generator when it’s not completely cool outside, especially if you’re using gas as your fuel source. Make sure that the air inside is clean and that there are no particles suspended in the air. This is especially important if you have a battery instead of regular gasoline or diesel because the acid inside the batteries will corrode whatever they come in contact with. If you do decide to use batteries, remember that they’ll need to be charged every few weeks or every month depending on what type you use. To ensure proper operation, it is best to have a professional battery charger or a dedicated appliance for just this purpose.

Final Takeaway

Making a portable 400 watt generator is a fun project to do with your family and friends. It’s a great way to learn how to operate heavy machinery while also using your body’s natural resources to generate energy. The key takeaway from this article is that you can’t go wrong by making your own electricity so long as you do everything correctly. There are numerous safety and regulatory precautions that you have to take so that the generator operates safely. We hope that this article has helped you in your quest to make a green and eco-friendly living space.

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