Recently, many users have received feedback: "My electric car charger has turned green, why do I have to charge it for more than an hour?" "I set the full stop, why the charging time is longer than usual"... The most common answer given by technicians is "float charging". What does floating charging  mean?

Chargers for lead-acid batteries for electric vehicles are generally three-stage charging modes, including:

1. The first stage is constant current and voltage limiting, charging the battery with a fixed current.
2. The second stage is constant voltage current limiting, also called constant voltage charging, which charges the battery with a fixed voltage.
3. The third stage is trickle float charge, also known as maintenance charge and float charge voltage. This stage is generally powered off after 2~3 hours.
4. C EV charging status of floating charging

Floating charging refers to running a fully charged battery pack in parallel with the charging equipment. Floating charging is mainly supplied by the charging equipment with a constant load. The battery does not normally supply power. The charging equipment supplements the self-discharge of the battery with a small current, and the load is short-circuited. A small amount of discharge caused by a sudden increase in time.
As the battery is left longer, the amount of electricity in the battery will gradually decrease, which is caused by the self-discharge characteristics of the battery. In order to balance the capacity loss caused by the self-discharge of the battery, a continuous, long-term trickle charge of the battery is required. This charging mode is "float charging".
What is the role of the float charge?
1. Keep the battery voltage within the range of the float charge voltage. At this time, the grid corrosion of the battery is in the slowest state, which can extend the battery life.
2. Replenish the capacity loss caused by the self-discharge of the battery to maintain sufficient power. It acts as a stable voltage and is in a standby state.
3. Inhibit sulfation caused by the recrystallization of active substances.
There is no limit to the floating charge time of the battery. As long as the voltage is within the range of the floating charge voltage, the lead-acid battery is not afraid of floating charge. For example, the long-life battery used in the communication system has a warranty period of more than 8 years. In addition to the use of mains failure and routine maintenance, it is always in a floating charge state.

With above informations, have you understand the reason why does your ev need more time to finish charging? Chengdu Khons technology Co., Ltd provides various solutions for your EV charging. meet our shop at Alibaba.