The no-load voltage of a car engine is approximately 13 volts.
The no-load voltage of the motor voltage in a car is about 13 volts, and the charging voltage is more than 11 volts (usually 12 V-16 V when the voltage of load is lower). beyond that, the engine can start. Unable to get up or very difficult to start.
Once the car is started, the generator begins to produce electricity. The battery voltage of 12 volt cars should be between 13.5 and 14.5 and the battery voltage of 24 volt cars should be between 27 and 29 Volts.
Causes of automobile engine voltage instability:
1. Voltage deviation is the actual voltage magnitude over a certain period of time. " Slowly changes and deviates from the rated voltage. The deviation is steady state, what we call high or low voltage;
2. The size of the voltage deviation mainly depends on the operation of the power supply. system, line impedance and changes in active and reactive loads, voltage deviations are mainly due to the location and operating time of electrical equipment, such as low voltage at the end of the line, high voltage at night, etc. ;
3. The main measures to improve the voltage deviation are: correctly select the voltage ratio and voltage tap of the transformer, reasonably reduce the line impedance, improve the power factor, reasonably compensate the reactive power, automatically cut off the capacity reactive power compensation. equipment according to voltage and load changes, and make timely adjustments according to the power flow distribution of the electrical system. Working mode: adopt e voltage regulation methodn load, such as a load voltage regulating transformer, etc.