12V battery production controller

Circuit shown in FIG. Circuit by the battery, the controller, with electrical and charging parts. Wherein: Zener diode DWl, resistors R1, R2 composition undervoltage detection
12V battery production controller - schematic

circuit, transistor Q1, Q2 and the resistors R3 and undervoltage relays automatic power control circuit execution. K1, K2, respectively Manual Off, open button switch machine, PV + solar panels charge the positive input terminal. Load preferably 1 2V DC electronic energy-saving lamps. working principle: When you needed electricity. Push button switch K2, at this time the relay coil is energized; while relay contact (1) and the contact (3) is closed is turned on, a positive voltage from the battery contacts (1) flow through the contact (3); circuit electrical work. Zener diode D1 when the battery voltage is higher than 10.8V breakdown conduction, transistor Q1, Q2 forward-biased conduction, this time relay maintain captive conductive state, even if the button is released K2, the circuit is still in normal working condition. When you need to turn off the power, hand-activated shut-off button K1, this time the base of Q1 b ground, Q1, Q2 synchronization off, the relay off, shut off. When the battery voltage is lower than the discharge 10.8V. Should stop discharging to prevent over-discharge damage to the battery. This function is performed by the undervoltage detecting circuit DW1, R1, R2 and execution circuit Q1, Q2, R3, and the relay is completed. When the battery voltage is lower than 10.8V, DWl reverse blocking, leading to Q1, Q1 is turned off, the relay off, reaching off automatically to protect battery discharge purposes. Components and options: Generating resistor 1/8W, with 4123 or T73 relay contacts and other current is greater than 5A of small electromagnetic relay, indicator selected 91L16,20V voltmeter, battery is maintenance-free lead-acid batteries 12V7Ah Above, DW1 Zener diode voltage requirements value between 9.0-9.1V, otherwise 10.8V overvoltage will not discharge design value. Other component parameters as shown, no special requirements. Printing and assembly drawing in the following figure, the figure V + of battery cathode, 0UT positive output voltage terminal. PV + connected solar panels (or charger) positive, GND of battery and PV panel (or charger) negative.

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