How do you calculate lithium-ion battery charging time? Here are the methods to calculate lithium (LiFePO4) battery charge time with solar and battery charger. Formula: charge time = (battery capacity Wh × depth of discharge) ÷ (solar panel size × Charge controller efficiency × charge efficiency × 80%)
The relationship between the charging and discharging time of a lithium battery and its capacity when discharging at 0.2C is as follows: charging time t = battery power c / charging current i
Note: The charging time will be in peak sun hours (PSH). Click here to read more about PSH. Formula: charge time = (battery capacity × depth of discharge) ÷ (charge current × charge efficiency) Note: Enter the battery capacity in Ah or mAh if the charger current output is mentioned in amps (A) or milliamps (mA).
There are two typical methods for estimating the state of charge of a battery: open circuit voltage (OCV) and coulombic metering. Another method is a dynamic voltage algorithm. The opencircuit voltage is assumed to be the battery terminal voltage when the battery rests for about 30 minutes.
To calculate the constant current discharge time for a lithium battery, use the formula: t = battery capacity / discharging current. For example, if the battery capacity is 2000MAH and the discharging current is 1000MA, the theoretical discharge time would be 2 hours (2000MAH / 1000MA = 2 hours).
If the capacity is given in amp-hours and current in amps, time will be in hours (charging or discharging). For example, 100 Ah battery delivering 1A, would last 100 hours. Or if delivering 100A, it would last 1 hour. In other words, you can have "any time" as long as when you multiply it by the current, you get 100 (the battery capacity).