The faster erosion is most likely due to higher amplitudes. Erosion results from cavitation and cavitation is a clear sign of ultrasonic action. If the erosion is faster than on the other equipment, this could mean that the amplitude of your first unit was lower. Did you get the power metering...
Typically algae doe not require exposure to sun light 100% of the time. One can use the sun light more efficiencly by pumping the algae with water through a glas reactor. 20 to 40 percent exposure should be enough. For a better understanding look at this...
Have you tested the http://www.hielscher.com/ultrasonics/products.htm" for quite some time. No trouble, no overheat. Comes at a price though :rolleyes:. However reading your problems I'm lucky I spent the extra bucks
What are you using your processor for? Welding?
Regards,
Alan