Solar street light overcharge and overdischarge protection

April 22, 2021

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In the application of solar street lights, attention should be paid to the overcharge and overdischarge of their batteries. The so-called overcharge control is to disconnect the charging circuit when the battery is overcharged, and the overdischarge control is to disconnect the discharging circuit when the battery is in an overdischarged state. This is done to protect the battery and extend it. Service life. The basis for judging overcharge and overdischarge is the change of the battery voltage: When the sun shines on a sunny day, the energy absorbed by the solar photovoltaic panel is charged to the battery via the relay switch normally closed point. When the battery voltage is higher than 26V, the battery In the overcharged state, the relay switch is normally closed and the normally open point is closed. The charging circuit is automatically disconnected to stop charging the battery and achieve the overcharge protection function. At night, the battery supplies power to the street lamp when the battery voltage is lower than 22V. The battery is in an over discharge state. The relay switch is switched from the normally closed point to the normally open point. The discharge circuit is automatically disconnected, and the power supply to the load (street lamp) is stopped, and the over-discharge protection function is realized.

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