To start the car and be able to drive in the summertime, it is enough to charge the battery for 30 minutes with a current of 10% of the battery capacity. This time is enough for its voltage to rise to 11.8 volts and the engine was able to start the starter without extra effort. In winter, you will need to put the battery on charge for at least 1 hour to raise its voltage to 12 volts. Further charging of the battery will come from the generator, when the car will be driven at speeds above 1500 rpm.