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voltage gauge reading low
When the car is powered on and not started, the normal value is 12.2-12.8 . If it is lower than 11.6 , it should be charged immediately . The normal voltage range of 12V lead-acid battery is generally 10.5V ~ 14.8V . Different brands of batteries fluctuate slightly up and down depending on the acid concentration and ambient temperature. During discharge, the voltage decreases with time . If the discharge is lower than 10.5V, it will be over discharge, which will inevitably cause irreversible damage to the battery. It is necessary to charge in time, reduce or turn off the load appliance. For the starting battery, Check whether the charging circuit of the generator to the battery is normal; When charging, the voltage increases with time . When it is higher than 14.8V, overcharge will also damage the battery . Check whether the charging circuit and generator are normal, especially whether the battery is short of water. Distilled water (non acid liquid) should be supplemented in time to avoid overcharge and heating of the battery until it is scrapped!
The vehicle voltage has three states:
1. No load voltage of the battery (the new battery is really 12V, and the aged battery may be very virtual 12V).
2. The charging voltage after the charger generates electricity (about 14V. Once the generator is finished, the vehicle can only rely on the electricity in the battery to maintain operation. Once the electricity in the battery is consumed, the vehicle will lie down).
3， Battery voltage at the moment of ignition (at the moment of ignition, the starter of the vehicle needs a large current > 100A. If the battery is aged, the internal resistance often increases, so the battery voltage drops sharply at the moment of ignition. For example, the normal no-load voltage of the battery is 12V, which drops to 11.3v at the moment of ignition; although the no-load voltage of the aged battery is also 12V, it will drop to 10V or even 9V at the moment of ignition, which needs to be considered in a timely manner Replace the battery).
Therefore, to sum up, the voltmeter inserted in the cigarette lighter can not display the key ignition instantaneous voltage value, so it is meaningless. Of course, if you change the lighting line to the normally closed line, you can display the ignition instantaneous voltage, or you can!
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