Dry battery models are one of the basic components of uninterruptable power supply. It is used in the applications such as telecommunication, alarm and security systems, wind energy systems, solar energy systems, defense industry, redressor. Increased use of renewable energy sources will also increase the need for batteries.
In general, batteries become active in the condition of energy cut. They do not feel the interruption. They are chemical-containing materials which provide the necessary time to close the systems in case of long period energy cut.
Even the best-designed UPS systems, although working years without failure, they need change of battery once 3-5 years. Battery life sometimes becomes a problem because users do not know enough information about this subject. Nowadays, lead-acid batteries are used in almost all interruptible power supply.
Depth of battery discharge :If a lead-acid battery is used as discharging up to 80-90% of the capacity of energy storage, its life reduce seriously. To prevent that, capacity of batteries should be higher than your needs. Batteries are discharged as low so their life is longer…
Environmental condition : One of the factors of specifying its life is ambient temperature which batteries work. Their ideal working temperature is 20-25 °C. At above and under these temperature range, their life reduce substantially.
Number of cycles of battery : A battery ‘s life is limited with the number of charger-discharge even all conditions is ideal. This number depends on model and brand and it is about 1000. When power cut occurs very often and batteries become in and out to the system is shorten their lives.
Discard date of battery: Every battery has a discard date and life-time starts to run from the moment produced at the factory. Because the internal structure of the batteries is chemical, the reactions begin during the production. Even if they are used under the ideal conditions and kept on continuous charge without any discharge, their capacity decreases and eventually becomes unusable
Storage : If the batteries stored for a long time, they must charge in certain periods (3 mounts-6 mounts). The otherwise , because of the continued internal reactions, sulphating occurs and anode and cathode become unusable.
Battery life expectancy : Nowadays, every salesman of battery must give two years guarantees because of the legal obligations imposed dry-type batteries. However, there is a subject very frequently confused with the guarantee; battery life expectancy. Dry-type batteries are produced with 3-5 years,5 years, 10 years or 10+ years battery life expectancy. These values give us the information of how many years this battery can be used, in the ideal using conditions. Life expectancy of a common used battery is 5 years.
