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Trying to find fun in the sun? We can help!

David’s favorite solar projects, from permanently fixed solar panels to portable cell phone charging, designed to create 21st century off-grid solutions.

David C. Flynn

—— Electrical Engineering Patent-Holder

Featured Projects

Flexible Solar Panels



How to manage permanently fixing a flexible solar panel, how to add it to an existing system, and the benefits of a nose-mounted or tail-mounted system. Also, David’s solar tests that help explain the benefits and drawbacks of this kind of design due to the natural arc of the sun throughout the seasons of the year.

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Fixed Solar Panels


Where should you place permanently mounted hard panels? Trying to determine what your roof can hold? How about the return on investment?

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MPPT Controllers


Get the most bang for your buck, why you need an MPPT controller, what works best, how it reports data, and what are the drawbacks of the design…

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Camper Battery Options



Lead acid, Lithium Ion, gel, saltwater–what type of battery will work best? The answer depends, in part, on your usage and the amount of maintenance you are comfortable with.

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Eternal Solar

David and Rosemary Flynn created Eternal Solar in an effort to provide all the comforts of the 21st century in off-grid living without the noise pollution of generator-created power. Join us on our journey by following everything from solar tests, to camping life hacks, and fun places to stay with your solarized devices!

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Photographs by Rosemary D. Flynn.

Eternal Solar logo artwork by Kathryn Flynn

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