| 摘要 |
A self-contained portable solar power supply system is specifically designed to convert solar energy into electrical energy, and charge a rechargeable storage battery to energize edge-lit lighted panels as back-lighting devices in the dusk to illuminate advertising graphics and messages installed on waste receptacles disposed on the city street curbs. The stored electrical energy is discharged by a dual control of a 24-hour timer unit and a photo light sensor control unit on a daily basis. To conserve the electrical energy consumption, the photo light sensor control unit is super-imposed as a second control over the time schedule of the 24-hour timer unit to ensure that the electrical energy will be discharged only when the photo light sensor control unit detects the light conditions in the immediate area diminish below a predetermined minimum light level setting. The photo light sensor control unit alleviates the need to reset the 24-hour timer unit as the local sunset time changes year-round. The rechargeable storage battery is protected by a power charge control unit against over-discharging the electrical energy below a predetermined voltage protection level of the rechargeable storage battery.
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