How to use a multimeter to judge the quality of UPS batteries?

1. Simulated discharge method. According to the battery capacity, such as 60ah, according to the safety discharge standard of 0.1C, that is, one-tenth of the capacity current, 6 ampere discharge. Be a high-power resistor, the resistance value is 12 (V) u0026pide; 6 (A) u003d 2 (). Use a multimeter to measure a section of 20 ohms on the electric stove wire of more than 1,000 watts, then measure one-tenth with a ruler, make a mark, and reliably connect the two battery cables at the two outer ends of the mark. The multimeter is placed on the DC voltage meter pen and connected to both ends of the resistor. Temporarily contact the battery cable connected with the red test lead to the positive terminal of the battery and the other to the negative terminal for 10 seconds. If the voltage remains above 10.8 volts, the battery is basically good. 2. Online charging measurement method. When UPS is charging the batteries online, measure each battery. If there is a problem with high voltage, remove the key measurement. 3. Online discharge measurement method. The UPS loads the load online, cuts off the external AC power supply, and uses batteries for power supply. There is a problem with the low voltage. Remove to focus on measurement. The principle of online measurement is based on the increase in the internal resistance of the bad UPS battery and the abnormal voltage at both ends of the battery during charging or discharging. The quality of the UPS battery can be judged from the appearance to observe whether the appearance is deformed, protruding, leaking, broken and exploded, burnt, and whether there is oxide seepage at the screw connection, etc. The traditional method of judging the battery capacity of UPS power supply is the same as the method of judging ordinary batteries. The whole battery pack is separated from the communication power system and connected to the resistance wire, discharged at a constant current rate of eight or ten hours, and then reaches the discharge termination voltage first. The discharge time and current of a single battery are used to calculate its capacity. In UPS systems, valve-regulated sealed maintenance-free batteries are mostly used. The reason why UPS can supply uninterrupted power is due to the chemical energy supplied by the battery. In the case of abnormal mains power, the inverter converts the chemical energy of the battery into AC power and sends it out to promote the load equipment to continue to work normally. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Introduction to lithium battery separator