One of the key advances over the past 20 years has been the development of affordable and cost effective evacuated tube collectors. If you live in an area that one would not consider very sunny, it is important how your collectors will function on partially cloudy and cloudy days. This question becomes even more important in those areas during winter when it is cold. Flat plate collectors loose too much heat to be operable in cloudy or partially cloudy weather in very cold climates.

Every tube on an evacuated tube collector is like a thermos bottle. It holds on to the heat it collects from the sun, even when the heat is small, thus allowing your hot water to be heated or your home.

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Sunrise through two 30 tube Solar collectors setup to track the sun from East to West. This array seeks the brighest spot in the sky and adjusts itself once every 20 seconds for a period of 1 second. Tracker board made by www.redrok.com. Model LED3X.

SFB-20 evacuated tube collector.