It is important to get the voltage when the battery is fully charged. The method is OCV=SG+0.84, for example, the density of the electrolyte is 1.35 g/mL, and the open circuit voltage of the battery is OCV=1.35+0.84=2.19V. Third, for a flooded battery, it can also be obtained by testing the density of the electrolyte of the battery when fully charged. The value will not be printed on the battery, but usually we can get it from the manufacturer’s operating instructions or MSDS. There are several ways to know this value:įirst, use a DC voltmeter to measure the voltage of the battery that remains more than one hour after fully charged, and the value is directly obtained. We call it as OCV (open circuit voltage) at 100% SOC (stage of charge). If you want to use it for a long time, it is recommended to perform this step carefully to determine the open circuit voltage when the battery is 100% fully charged. If you only need to charge the battery once in the way described in this article, you can skip this step. Note that it’s 2.4V per cell, NOT 2.4V per unit. There may be overcharge, causing certain damage to the battery. If you do not know the open-circuit voltage when the battery is fully charged, you can occasionally charge with 2.4V per cell blindly, but it is more difficult to judge when the battery is full.
#Agm battery plus#
Generally, the open-circuit voltage of the 12V battery when fully charged plus 1~1.5V is a reasonable cycle charge voltage. If the charge voltage is not indicated on the battery, the reasonable cycle charge voltage can be estimated according to the open-circuit voltage (OCV) when the battery is fully charged. When the temperature is high, it is extremely important to be careful of overcharging due to high voltage. Temperature compensation is -30mV/☌ for cycle charge voltage, -20mV/☌ for float charge voltageĪt low temperatures, the charge voltage may be slightly higher. The highest value of the cycle charge voltage (15.0V) could be considered as the fast charge voltage, which is always considered to cause damage to the battery. Or you can also choose the safer intermediate value or minimum value. For example, as shown in the above photo, the float voltage is 13.5V~13.8V, and the cycle charge voltage is 14.4V~14.9V. Some batteries are marked with charge voltages on the label or print, including float charge voltage and cycle charge voltage. On regular basis at 25☌ for 12V deep cycle AGM batteries, float charge voltage is 13.5V~13.8V, cycle charging voltage is 14.4V~15.0V. Please note that the appropriate voltage is different for flooded or gel batteries. All parameters are generally based on 25☌. Specific cycle charge voltage and float voltage refer to the following table.
24V and 48V are also found in battery banks. In different combinations, the popular voltages are 2V, 6V, 12V. The nominal voltage of a single AGM battery cell is 2V.
#Agm battery full#
Fast charge is the voltage of rapid full charge under an emergency condition, the highest, not commonly used. Cycle charge voltage is used for recharging after discharged to a certain depth, it is higher. In general, the float charge voltage is used for daily floating charges, the lowest. The charge voltage includes cycle charge voltage and float charge voltage, fast charge voltage. The battery current is shallow, and this phase is critical to activate the whole materials inside the battery, which helps to maintain a good health condition of and extend the lifetime.įor more detailed information, please visit this link: The 3rd stage is supplemental or trickles charge. After the current is reduced to a very small value, stage 3 begins, reducing the voltage to the float voltage. The 2nd stage is Constant Voltage, where the battery voltage remains at a constant value and the charge current decreases. During this phase, the battery voltage rises to a constant number. The specific voltage and current will be explained in detail in the next 2 parts. Please note that too high voltage or too high current will overcharge the battery and damage the battery. We set the charger voltage to the battery (pack) cycle charge voltage, and the current to the cycle charge current. The 1st stage is constant current charging, CC for short name. The THREE STAGES CHARGING are Constant Current charge (bulk charging), Constant Voltage charge (absorption charge), and Supplemental charge (float charging).
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