Deep-cycle, lead-acid batteries are a popular choice for renewable energy applications due to their ability to withstand the demands of solar energy use such as unstable grid energy, heavy cycling (charging and discharging) and irregular full recharging. As far as deep-cycle lead-acid batteries in solar, flooded and valve regulated options are the most viable for storage. Both have pros and cons depending on your sites environment and application. One valve regulated optionabsorbed glass mat (AGM)is especially advantageous as it is maintenance free, while flooded batteries require watering. Since solar applications can be in hard-to-reach areas, the ability to plug in the batteries and let them function without maintenance is a huge benefit. AGM batteries recombine the hydrogen and oxygen produced during recharge which forms water. This recombination makes the AGM battery maintenance free so you dont have to worry about watering, acid leaks or corrosion.
Many AGM batteries, however, are primarily designed for dual-purpose or standby applications like emergency backup, and not deep cycling. But Trojan has recently introduced the Reliant AGM with C-Max Technology line. The manufacturer said the line is specifically designed for deep cycling applications through its paste formula, its durable polymer case that provides higher battery cell compression, and a flame arrestor for each cell for maximum safety. The batteries also have a thick separator which ensures high compression for effective contact with the glass mat and plates. This protects against stratificationa condition in which lead sulfate builds on the plates, which eventually reduces storage capacity and battery life. The batteries are manufactured in the U.S. at Trojans newest production facility in Sandersville, Georgia.
Battery sizing is also an essential part of the equation, which is often overlooked by users and installers, said Vicki Hall of Trojan Battery. The single biggest problem in battery underperformance is miscalculated load, she said. Batteries in PV systems are routinely undersized due to cost or because the system loads were underestimated. A homeowner adds another TV, and suddenly they dont have enough power. Its important to know the customers power needs and correctly plan for it.
Trojan offers an online battery sizing calculator, which you can find on the companys website, to make determining battery capacity for load requirements easy.
Solutions for solar battery storage are there, Hall said. Its just a matter of knowing how much energy you need and choosing a battery big enough to handle it.
Source: Solar Power World
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