Tuesday, November 3, 2009 at 2:30PM 
Hydro power can play a significant role in energy production on the farm. A stream engine from Energy Systems and Design, Ltd. (http://www.microhydropower.com/sefly.pdf), is capable of storing 165 kW*hrs for 800 hours of run time on a full 468,000 gallon tank assuming 2.5 liters/second. The excess energy gathered from the PV arrays and wind, if used, would be used to pump water up to the top of the hill. When excess power is needed, a valve would open and send water through a turbine, producing 200 Watts of instantaneous power. For perspective, an average home consumes about 8,900 kW*hrs per year. Assuming 16 hrs per day of constant load, this equates to 1.5 kW continuous power. The water storage system would allow for a significant ammount renewable energy to be stored and made available when demand is increased on site.
According to the above website, power distribution for on-site generation relies on a battery bank to regulate power and divert excess power to a shunt load. Instead of wasting power to a shunt load, the pump could draw on this power source.
Ceramic baterries are an alternate aproach to store energy. Ceramic batteries similar to this one:
This battery is the size of a refrigerator and can store 20 to 40 kW hrs and is projected to cost $2,000 dollars which equates to $0.03 per kW hr stored for the life of the battery.
Christina Duncan, Tim Olson, Josh Doerr
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