Patent ID: 6188200
Filing Date: 2001-02-13
Classification: F04D,H02J

Abstract:
A system for selectively providing alternating current power to a pump from an electric utility connection and from a battery, comprising:means for receiving power from the electric utility connection;charging means connected to the battery and the means for receiving power for charging the battery with power from the electric utility connection and for maintaining the battery in a fully charged state;an inverter circuit connected to the battery for outputting alternating current at an inverter output;said inverter circuit being a transformerless circuit including a plurality of power MOSFET transistors;a conversion relay connected to the inverter output and the electric utility connection for supplying power to the pump from one of the inverter circuit and the electric utility connection to a main output, said conversion relay including first input contacts, second input contacts, output contacts and movable contacts; anda coil positioned in said conversion relay for drawing the movable contacts into contact with the first input contacts only when power is applied to the first input contacts from the electric utility connection.