Overcharge and over discharge protection of solar street lights
Overcharge control means that the charging circuit should be disconnected in time when the battery is in the overcharge state, and the overdischarge control is to disconnect the discharge circuit in time when the battery is in the overdischarge state, in order to protect the battery and extend its lifetime.
The basis for judging overcharge and overdischarge is the change in battery voltage:
When there is sunlight on a sunny day, the light energy absorbed by the solar photovoltaic panel is charged to the battery through the normally closed point of the relay switch. When the voltage of the battery is higher than 26V, the battery is in an overcharge state, and the relay switch is normally closed and normally open. When the point is closed, the charging circuit is automatically disconnected, and the charging of the battery is stopped to realize the overcharge protection function;
At night, the battery is powered by the battery. When the voltage of the battery is lower than 22V, the battery is in the 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 light) is stopped. Put protection function.
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