Windstream ® Permanent Magnet DC Generators

For wind and microhydro turbines

Windstream®  offers a selection of 4 Low RPM Permanent Magnet DC Generators plus one High RPM model.  Performance curves and specifications are available on each generators by clicking on the individual generators to your right. See below for links to detailed information regarding output, current, start up torque, efficiency etc. These are most typically used for small wind power or microhydro power applications.

More information about Understanding Output Voltage



Click here for a detailed description of  What happens when a small permanent magnet DC generator is charging a battery.

Click here for information about EFFICIENCY

Click here for an in-depth comparison between DC generators, alternators etc

These are by far our most popular generators. The predecessor of this line of generators, the TC-25G sold over 10,000 units in the 1970′s. These generators are so sensitive that they generate power at any RPM. They are compact and have a wide operating range so they are sure to work in many applications. In fact, these are the same generators found in our own Human Power Generator, which uses the # 443541 generator.

One of the best qualities of these generators in battery charging applications is that the generator will generate electric current based on load. This means that if a battery is fully discharged it will accept a great deal of power to charge it, but as it approaches a full charge, the amount of electricity accepted will be very little. In terms of the generator, the generator will be more difficult to turn when the battery is discharged and very easy to turn when it is full.

You may want to purchase a “POWER-UP” Diode Kit with your Generator if you are charging at 10 amps or under.  We also have the Full Wave Bridge Rectifier for applications charging at up to 35 amps – see Spare Parts

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Rusted out armature

These generators are not waterproof. If you are using them in an outdoor application, they must be sealed from the weather. See photo at right to see what happens to the internals of a generator that has gotten soaked.

Thinking about designing and building a small wind turbine?  In order to match a generator to a turbine design, one would have to have an idea of the rpm range and the load. Building a prototype wind turbine can involve a lot of trial and error. The mantra is “build it, measure it, here for a great resource for windpower.

It is imperative that one come to their project with an understanding of the function of rpm and load and how these factors affect power output.

While we will do our best to assist, there are often so many unique and unknown variables, we can only guarantee what we know – which is the operating range of each generator ( please see continuous vs.intermittent duty information for each generator).   Our generators are a non-returnable item once connected to a power supply.