Low Amperage Draw And Impeccable Maintenance Kept A Battery Energy Storage Bank Operable For More Than A Decade
Grover, Wyoming resident Jody Jenson, isn’t living “off-grid,” but his home is in a rural part of the state, where water comes from a well and delivered to the home by electric pumps. After several power outages, he didn’t want to rely on the city’s power grid to have fresh water, so he built a 48-volt solar system with U.S. Battery Deep-Cycle batteries for energy storage that have provided 16-years or reliable service. “I did not like the vulnerability of relying on the grid for our drinking water,” said Jenson. “I spent over $12,000 on this system, including digging a new 100-ft. well. It definitely wasn’t to reduce costs, but more about having freshwater availability.”
To supply power to the pump system Jenson utilizes four 120-watt solar panels mounted together and wired to provide 24-volts and is connected to a circuit breaker and charge controller. To store energy, he uses eight US L16HC XC2 batteries. “The system powers the well-pump that draws 4-amps, depending on groundwater level, but it’s pretty consistent,” he says. “It takes about 18-hours to fill the 1200 gallon cistern. The system normally runs about 12-hours between low and full tank levels. From the cistern, there’s another pressure pump that draws six amps for approximately three minutes after starting, providing roughly 30-gallons between cycles.”
Even though the system doesn’t draw huge amounts of amperage, Jenson never expected that the US L16HC deep-cycle batteries would last 16-years. “When I bought them, I remember being told that with proper maintenance, they should last something like five years,” said Jensen. “I knew with care, they would last longer.”
Jenson has taken exceptionally good care of his deep-cycle batteries, demonstrating how cost-effective flooded lead-acid batteries can be with proper maintenance. His routine includes weekly and monthly procedures. “Every week I go to check the system, including the water level in the cistern, corrosion on the battery posts, charging rate, and battery voltage,” he says. “The batteries are still showing 26.5-volts fully charged. Once a month, I also check battery water levels and the amperage draw of the two pumps. This gives me any clues as to any problems that might be occurring. Quarterly, I add distilled water to the 24 individual cells.”
While most people would consider this an impeccable maintenance routine, Jenson also includes periodic equalizing charges. “After adding water, I equalize the bank of batteries with the charge controller for a period of two hours at a maximum of 16-amps,” says Jensen. “I have never equalized without the batteries being fully charged. I’ve totaled up all the water I have added over the years, and as of today, from February of 2003 to now, I’ve added 63-gallons of water to the 24-cells!”
In addition to Jensen’s unique system and maintenance procedures, U.S. Battery L16 HC deep-cycle batteries feature the company’s XC2 formulation that uses Diamond Plate technology, highly efficient synthetic tetrabasic lead sulfate (TTBLS) crystal structures that enhanced performance, charging, and extend battery life. U.S. Battery also manufactures a line of Renewable Energy Batteries that are specifically designed for energy storage and feature Defender Moss Shields that reduce mossing and sulfation conditions, and Outside Positive Plates that mitigate the effects of plate sulfation.
While receiving 16-years of service from a set of deep-cycle batteries is not common, Jenson’s theory of having a large battery bank with a relatively low amperage draw, does demonstrate what low depth-of discharge and proper maintenance procedures can do to extend the life of deep-cycle batteries used for energy storage.