by Dan Rojas, GreenPowerScience
GreenPowerScience is done by Dan and Denise Rojas, who are both former SAG actors through 1990 with experience in national TV commercials, motion picture production work and a national release made for television movie parts. GreenPowerScience was formed in 2007, offering scientific experiments in an open source format. Starting as a hobby expressing many personal scientific findings discovered from years of tinkering, the GPS channel and website has grown to over 70,000 subscribers.
This time around, GreenPowerScience presents for your viewing videos on a solar weed trimmer, solar Stirling parabolic mirror and a ten minute solar stove.
Solar Weed Trimmer
All brands of rechargeable trimmers have a battery life issue because they need to remain lightweight. Over time the charge controller board does not allow for a good deep battery charge so they only last a minute. You can find them at yard sales all the time. If you have a spare panel with MC connectors this is a fun easy fix. An external charge controller (not shown) can be added for quick solar charges needed in heavily shaded areas. You can use up to a 50 ft extension cord before voltage becomes a problem. Great solution for larger yards far from power. No more burning up electric AC trimmers with 200 ft of cord. I guess you could use a gas trimmer but the exhaust is very bad for you.
Solar Stirling Parabolic Mirror
This is a larger Stirling engine that has a 12v DC Permanent Magnet motor operating fixed as the flywheel bearing. It produces 15 Volt max with NO LOAD. This setup as is produces about 15 watts. The heat sink is a water cooled tank that is a bit short for the displacement piston but does work. I will be adding some heat sinks soon and testing it with the 56 inch dish and a Fresnel Lens. The motor/generator has an additional pulley that the other engine I have may be tied to. The water can be fed continuously or as a tank.
10 Minute Solar Stove
This solar stove took about 10 minutes to throw together and we actually use this on almost every sunny day. It can cook frozen chicken, or turkey burger meat in under 20 minutes. This is a much safer method of cooking than the Fresnel Lens.
Editor’s Note: This mix of videos comes to us courtesy of GreenPowerScience. Author credit goes to Dan Rojas.