Power storage battery is a important part of solar system. How to maintain the power storage battery?

1. Charging current

Too large or too small charging current will affect the service life of the battery.

2. Charging voltage

If the charging voltage is too high, the battery will easily lose water, heat and deform, otherwise the battery will be insufficiently charged and the charging voltage will be abnormal, which may be caused by the wrong configuration of the charger, or caused by the fault of the charger.

3. DOD depth of discharge

During the use of the battery, the percentage of the capacity released by the battery to its rated capacity is called the depth of discharge (DOD). The depth of discharge is closely related to the life of the battery. The deeper the depth of discharge, the shorter the charging life. Therefore, deep discharge should be avoided as much as possible during use. The battery discharge depth is about 10% to 30% is shallow cycle discharge. The discharge depth is about 40% to 70% is medium cycle discharge. And the discharge depth is about 80% to 90% is deep cycle discharge. Generally speaking, the deeper the daily discharge depth of the long-term operation of the battery, the shorter the battery life, and the shallower the discharge depth, the longer the battery life. Shallow cycle discharge is beneficial to prolong battery life. The shallow cycle operation of the battery has two obvious advantages: first, the battery generally has a longer cycle life. Second, the battery often maintains more backup ampere-hour capacity, which makes the power supply guarantee rate of the photovoltaic system higher. According to actual operating experience, a more moderate depth of discharge is 60% to 70%.

4. Battery installation

The battery should be installed in a clean, cool, ventilated and dry place as far as possible, and should be protected from the influence of sunlight, heaters, or other radiant heat sources. Batteries should be placed at attention and not tilted. The terminals between each battery should be firmly connected.

5. The environment temperature

The temperature greatly affects the battery. If the temperature is too high, the battery will overcharge and generate gas. If the temperature is too low, the battery will not be charged enough, which will affect the service life of the battery. Therefore, the temperature of about 25℃ is the best.

6. Regular maintenance

The battery should be checked regularly after a certain period of use, such as observing whether its appearance is abnormal, measuring whether the voltage of each battery is average, etc. If there is no power outage for a long time, the battery will always be in a charged state, which will deteriorate the activity of the battery. Therefore, even if the power is not outaged, it is necessary to conduct regular discharge tests to keep the battery active. The discharge test can generally be carried out once every three months. The method is that the inverter is loaded, preferably more than 50%. The discharge duration depends on the battery capacity, usually a few minutes to dozens of minutes.