When within an hour at the battery terminals, when charging, the voltage stops increasing - the battery is charged at 100%.
The use of the calculation formula must be accompanied by monitoring the progress of the charging process, especially when it is completed, so as not to miss the beginning of rapid boiling. The formula for calculating how much time to recharge the car battery looks like that:
CHARGE TIME CALC FULL
After substituting your values, you will see that a lot of time is obtained, but since, often, it does not require full charging, but only restoring the lost capacity, then this figure will be two or one and a half times less.įor an approximate estimate of the time required to charge a car battery with direct current, you must first determine the degree of discharge of the battery (in percent), then determine the lost capacity (in Ah), and then select the amount of charging current to calculate the full charge time. Proceeding from such a recommendation, the calculation of the time that is needed for a fully loaded battery has the following form: T = Q / I. The formula for calculating the charging current is: I = Q * k, where Q is the battery capacity, and k is a certain ratio of the nominal (its ideal value is within 0.04… 0.06, and the optimal value is 0.1).
Stages of discharged car battery Battery charging time at constant current The purpose of this method is to ensure full recovery of the active masses in all battery plates. So for a battery with a capacity of 55 Am / h, this value is 2.75 A, and for 60 Ah it is already 3 amperes. The optimal charging current of the battery is considered to be current equal to 0.05 of its capacity ( equalizing charge). Also, an additional battery requires that battery, the density in the banks of which differs by more than 0.02 g/cm³. The lead-acid battery, which in summer is discharged by more than 50%, and in winter, even more than 25% must be removed and recharged. The degree of charging should be determined by the bank having the lowest density. The decrease in density by 0.01 g / cm3 compared to the nominal means that the battery is discharged by about 6-8%. The lower the density, the more discharged it is. Everything will depend on what density of electrolyte has been initially installed in the new battery of your region of residence, it can be as 12.7V so as 12.9V. The density of a fully charged battery should be 1.26-1.28 g / cm ³, voltage not less than 12.5 V. Generally, the state of battery charging is judged by the density of its electrolyte. When, how and what current is needed to charge A heavily discharged battery may take 14–16 hours or more. How long a used battery will be charged depends on its degree of discharging, time of operation and condition. The first charging of a new (uncharged) battery can last for a relatively long time: 25–50 hours (depending on the state of the battery).
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