Question
Why should a series diode be connected between a solar panel and a storage battery that is being charged by the panel?
Answer Options
- A) To prevent overload by regulating the charging voltage
- B) To prevent discharge of the battery through the panel during times of low or no illumination
- C) To limit the current flowing from the panel to a safe value
- D) To prevent damage to the battery due to excessive voltage at high illumination levels
Correct Answer: B
Explanation
Solar panels, like any other source of voltage, can act as a load when they are not producing power. In the absence of sufficient sunlight (low or no illumination), the solar cells can conduct current backward, draining the charge stored in the connected battery.
A diode, which acts as an electrical one-way valve, is connected in series between the panel and the battery to prevent discharge of the battery through the panel during times of low or no illumination. This is called a blocking diode, and it is a necessary component for protecting the battery charge in a solar power system.
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