German solar battery charging suggestions

The thick plate technology of German solar battery and the unique gel electrolyte preparation and heating plastic technology ensure the service life of the battery; With longer service life and higher reliability, it can be applied to harsh high and low temperature environment and harsh power conditions. Now let's introduce how to charge the solar battery in Germany.

1. Control the charging voltage to prevent over-voltage charging

For batteries with terminal voltage of 12V, the normal floating charge voltage is between 13.5 and 13.8V (25 ℃), and the average charge voltage is between 14.1-14.4V25 ℃). The floating charge voltage is too low, the battery is not fully charged, and the floating charge voltage is too high, which will cause over-voltage charging. When the floating charge voltage exceeds 14V, it is considered as overvoltage charging. Overvoltage charging will cause the water in the electrolyte to be separated into hydrogen and oxygen and overflow, which will shorten the battery life.



2. Control the charging current to prevent over-current charging

The ideal charging current should be phased and constant-current charging, that is, a larger current should be used at the initial stage of charging, and a smaller current should be used after a certain period of charging, and a smaller current should be used at the end of charging. The charging current is generally designed as 0.1C. When the charging current exceeds 0.3C, it can be considered as over-current charging. Overcurrent charging will cause the battery plate to bend, the active material to fall off, and the battery will be damaged.?



3. Prevent UPS battery from over-current discharge

The actual discharge capacity of the battery is related to the discharge current. The higher the discharge current, the lower the efficiency of the battery. For example, when the discharge current of 12V/24Ah battery is 0.4C, the time from discharge to termination voltage is 1 hour and 50 minutes, the actual output capacity is 17.6Ah, and the efficiency is 73.3%. When the discharge current is 7C, the time from discharge to termination voltage is only 20s, the actual output capacity is 0.93Ah, and the efficiency is 3.9%. Therefore, large current discharge should be avoided to improve the efficiency of the battery. In general, circuit design and load selection by users should protect the inverter discharge current of UPS battery from exceeding 2C.



4. Prevent UPS battery from deep discharge Although small current discharge can improve the efficiency of the battery, when the battery is discharged for a long time with a small current (less than 0.05C), the actual discharge capacity of the battery will exceed its rated capacity, resulting in serious deep discharge of the battery. According to the manufacturer's data, when the battery discharge depth is 100%, the actual service life of the battery is about 200~250 charge-discharge cycles; When the discharge depth is 50%, it is about 500~600 charge-discharge cycles. Therefore, when using UPS, it is necessary not only to avoid over-current discharge of heavy load, but also to avoid deep discharge of battery caused by long-time light-load inverter.