Abstract Water wheel low speed surface aerator Chaipattana Model RX-2-2 was the 9 th patented aerator in the world. The patent was granted to the late king of Thailand, King Bhumibol Adulyadej, with Patent No. 3127 February 2 nd , 1993, Water wheel low speed surface aerator Chaipattana Model RX-2-2. This model powered by induction motor 2 HP (1.5 kW) 380 VAC 50 Hz 1,450 RPM with warm gear and sprockets. Water wheel low speed surface aerator Chaipattana Model RX-2-2 widely used in Kingdom of Thailand with standard aeration efficiencies (SAE) of 0.7-1.2 kgO 2 .kWh -1 . However in many instances it had no access to conventional power. Rural people could not afford for electical bills. Solar powered aeration would meet these requirements, without a battery powered storage, lower power consumption, longer operation time, low cost, easy to operate, lighter, and easy to transportation. The aim of this project was to develop a system that has lower power consumption, 0.25 HP (200 W) operate with solar power without battery. It could operate at least 8 hours. Water wheel low speed surface aerator Chaipattana Model RX-2-3 was developed. This model is capable of transferring oxygen at SAE up to 1.5-2.1 kgO 2 .kWh -1 . This new design was developed a solar controller that match motor with solar cell for optimum performance.
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