Technology
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Pond aeration is a common agricultural application for photovoltaic solar. Pond aeration helps improve water quality, reduce odours, improve fish growth, and limit algae growth. Often, sites where aeration would be beneficial, such as dugouts or lagoons, are significant distances from the electrical grid. Rather than using a fossil fuel generator or a battery system that requires grid or generator charging, photovoltaic solar can be an economical and reliable power supply. While the capital cost is often higher than alternatives such as a diesel generator, PV pond aeration systems can pay for themselves in a few years from fuel cost offsets, reduced maintenance costs and time. PV pond aeration systems are used in applications ranging from small garden ponds and fountains to fish farms, livestock watering dugouts and lagoons and small lakes.
Solar water aeration systems can be simple systems with a PV panel directly connected to a DC compressor that sends air through a diffuser. With the use of an inverter, AC compressors can be used as well. Batteries can be charged if aeration is required more frequently than the sun shines. A controller regulates the amount of electricity delivered to the compressor from the PV and to the batteries. Solar pond aeration systems are commercially available and are frequently sold as kits. PV can also be designed to operate an existing aeration system. It is important that the PV is sized to meet the load of the aerator and for the climate and available solar resource.
There are a variety of different pond aeration systems available. Some aerators work from the surface while others deliver air to the bottom of the pond/water source. A variety of compressors are available. Ensure that the system is designed to meet your aeration needs. Different compressors and systems will have different warranties, life expectancies, maintenance requirements and efficiencies. It is advisable to find a system that is as efficient as possible while still meeting your aeration requirements. Generally, even if more expensive, a more efficient compressor/aerator will save you money on photovoltaic panels. Oil-less compressors are recommended for use near water to reduce the risk of spills and contamination.
Modified: 02-14-2008
