Lead-acid batteries are made for specific applications, and some aren’t a good fit for renewable energy (RE) systems. Automotive and commercial starter batteries deliver short bursts of power and stay at full charge most of the time, making them unsuited for such applications. Uninterruptable power supply (UPS) batteries are designed to provide backup electricity during power outages but will not tolerate continuous discharge and charge cycles. Deep-cycle batteries deliver electricity for a long time, even multiple days, because they’re designed for constant discharge and charge cycles. The difference between deep-cycle and RE-specific batteries is that RE batteries’ basic design accounts for the specific requirements of renewable energy applications. Flooded batteries are the most commonly used batteries in RE and grid-backup systems, because they’re affordable, easy to maintain, long-lasting and reliable. Valve-regulated lead–acid (VRLA) batteries, such as absorbent glass mat (AGM) and gel, are maintenance-free but typically more expensive. Whatever type of battery you choose, know which materials, construction methods and quality control systems translate into affordable, reliable power for your system.
Especially for deep-cycle applications (floor machine, golf cart, aerial platform, electrical chairs, etc..) battery must be fully charged after discharge every time. Battery musn't be used without fully charge. Please study inctructions of the battery for charge rules. (charge voltage, charge current, temperature, etc..)
Factors to Consider to choose Battery for Solar systems:
• What is your daily usage in Kw Hours. This is a little tedious to calculate but necessary.
• How reliable is your sunshine - do you generally get clear sun most days or is it much less reliable.
• How long do you expect your system to cope without sunshine.
• Do you also have a wind turbine, and if so, how reliable is the wind.
• How efficient and convenient is your backup system. If you have an efficient diesel generator that starts automatically when required, this will reduce your need for battery storage. Another fact to consider is that, although we are talking about batteries that are designed for deep cycle use (they are expected to cope being regularly drained and then recharged), the greater depth to which they are discharged, the shorter their life is likely to be. Deep cycle batteries can generally cope with regular discharging down to approximately 60% of their capacity and occasional discharging down to 20%. Therefore, all else being equal, a larger capacity battery should have a longer life.
* Surface of battery should be dry and clean.
* Battery should be charged according to the instructions.
* Battery must be fully charged after use without delay. Battery shouldn't be use before being fully charged. If it use, battery becomes sulfated and loss capacity.
* Ideal room temperature to be about 25 0C for battery. Each +10 0C of rising reduce battery life 50%.
* Quality charger should be use.
If battery to be over charged and/or work under high temperature (25 0C and above) internal reaction increase and therefore internal pressure to be over. Under these conditions battery becomes deformed (swollen).
Plates inside to be sulfate and loss cabability to keep power. So, some time later battery can't work. If battery to be wait for a long time as to be full charged, it should be recharged every 2-3 months.
A battery can change chemical energy to electricity by putting certain chemicals in contact with each other in a specific way. Electrons, which are small parts of an atoms, will travel from one kind of chemical to another under the right circumstances. When electrons flow, this makes an electrical current that can power something. What a battery does is put the right chemicals in the right relationships, and then puts a wall between them. Only when the two sides of a battery are connected by a wire or another conductor can the electrons flow.
During use, small sulfate crystals form, but these are normal and are not harmful. During prolonged charge deprivation, however, the amorphous lead sulfate converts to a stable crystalline and deposits on the negative plates. This leads to the development of large crystals that reduce the battery’s active material, which is responsible for the performance.Sulfation occurs when a lead acid battery is deprived of a full charge. Lead acid must periodically be charged 14–16 hours to attain full saturation
A deep cycle battery has the ability to be deeply discharged and charged many times during its service life. It is designed specifically for powering electrical equipment for long periods of time. An automotive or starting battery is designed for brief bursts of high current and cannot withstand more than a few deep discharges before failure. This is why it is unable to start your car if you accidentally leave the lights on more than a couple of times. For applications where both engine starting and light deep cycling are required, a dual-purpose battery is often used. This type of battery is neither a starting nor a deep cycle battery but rather a compromise between the two so it performs both functions adequately. Only deep cycle batteries should be used in renewable energy applications.
|Dolar (USD) Effective||6.1454||6.1209|
|Euro (EUR) Effective||6.8452||6.8179|