POWER_CHECK

Published:2009/7/16 20:31:00 Author:Jessie | From:SeekIC

This system is basically an ammeter with a tricolor LED readout in place of a conventional meter. In this system, the tricolor LED shows green for a low demand, yellow for a medium one (acceptable for a temporary heavy load, such as a water pump), and red to indicate excessive use and the need to switch appliances off right away. When red shows, an audible signal is also given. The circuit is built in a small metal box, with the LED mounted on the front panel. A piece of terminal block inside is used to make the connections to the external system. This circuit must not be used in installations using more than 10A. Having said that, though, the values at which the colors operate are freely adjustable. In the prototype unit, a current below 2A was judged to be low; one between 2 and 4A, medium; and one more than 4A, high. With these criteria, by keeping green, at least 20 hours of operation would be obtained from a standard 60-Ah battery.



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