Emergency power or temporary emergency power
can be provided by automatic connection of a battery at loss of main power. A simple arrangement is shown (Fig. 1.6) for lead-acid batteries. This type of secondary cell loses charge gradually over a period of time. Rate of loss is kept to a minimum by maintaining the cells in a clean and it is necessary to make up the loss of charge: The system Shown has a trickle chargeIn normal circumstances the batteries are on Standby with load switches (L) open and charging switches (C) closed. This position of the switches is held by the electromagnetic coil against pressure of the spring. Loss of main power has the effect of de-energizing the coil so that the switches are changed by spring pressure moving the operating rod. The batteries are disconnected from the mains as switch C opens, and connected to the emergency load by closing of L.
Black & Decker SS50B Storm Station With 50 Watt Power Inverter LED Flashlight And Digital AM/FM NOAA Weather Radio
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