In the past, most residential solar users deploying battery storage systems used lead-acid batteries, especially those that were completely off the grid, but that has started to change in the past few years, according to foreign media reports. As more and more Energy Storage lithium ion batteries are used in residential energy storage systems, which is more suitable for energy storage systems, lithium-ion battery or lead acid batteries? Here’s a summary of the pros and cons.
Since the 1970s, lead-acid batteries have been used as a backup power source for residential solar power facilities. Although they are similar to conventional car batteries, batteries used in residential energy storage systems are known as deep cycle batteries because they discharge and charge more than most car batteries. Traditionally, lead acid batteries cost less than lithium-ion battery, making them more attractive to residential users. But their working lives are much shorter than those of lithium-ion battery. Lead acid batteries have a life of less than lithium-ion battery. While some lead acid batteries can be charged and discharged as many as 500 times, lithium-ion battery batteries can be charged and discharged between 2,000 and 4,000 times. Most Lead acid battery have a useful life of about five years and a corresponding guarantee period. As a result, residential users will have to replace lead-acid batteries several times during the overall life of a solar power facility.
Lithium-ion battery is quickly becoming the preferred battery for many power applications, from wireless power tools to laptops and cars. More and more residential solar power facilities use lithium-ion battery. But lithium-ion battery still has some limitations, the first and most important being its high cost. Lithium-ion Battery’s upfront costs are higher than those of lead acid batteries. Tesla’s Powerwall Energy Storage System sold for $5,900, or $6,600, in the U.S. in 2018, including the accompanying hardware. This is a 14 kwh battery system that can provide up to 7 kw of power at peak demand. The cost does not include installation costs, which typically range from $600 to $2,000. But the cost of lithium-ion battery is falling fast. In the past few years, Lazard has evaluated the cost of various battery storage technologies in its energy storage average cost analysis. In its latest report, published in November 2017, it found that lead-acid battery storage systems for residential solar power cost between $598 and $635 per kwh to install. Installation costs for lithium-ion battery range from $831 to $1,089 per kwh. According to these figures, a 14 kwh lead acid battery costs as little as $8,372, while an equivalent capacity lithium-ion battery battery costs as little as $11,634. But the low cost of lead-acid batteries hides many other costs, such as shorter working lives and higher operating costs. The cost of the battery system will vary greatly over time. SmartPropel’s research shows that energy storage systems using lithium-ion battery can cost less per megawatt hour than lead acid batteries. Lead-acid storage systems cost between $1,160 and $1,239 per megawatt-hour. Lithium-ion battery systems cost $1,024 to $1,274 per megawatt hour.
Costs are also falling, according to a separate survey by lithium-ion battery. Lithium-ion battery was selling for $1,000 per kilowatt hour, and prices have fallen by more than 20% in the years since. By the end of 2016, the average lithium-ion battery price had fallen by $209 per kilowatt hour. However, Mark Chediak of Bloomberg new energy finance points out that these prices are mainly for batteries supplied by electric vehicle manufacturers. “Because fixed-storage system developers have much lower orders, the estimated cost of the battery is 51 percent higher than what the automakers are paying,”he said, it is important to understand the current costs of lithium-ion battery and lead acid batteries for residential energy storage systems. They can be used either as stand-alone energy storage systems or in conjunction with residential solar power generation facilities to meet the energy needs of some or all residential users or business. Now SmartPropel has standard lithium battery models to replace lead acid battery, from 12V 50Ah lithium battery, 12V 100Ah lithium battery, 12V 200Ah lithium battery to 12V 300AH lithium battery.
In terms of working life, the lithium-ion battery are expected to last about 10 years and they are able to charge and discharge to higher levels without significantly reducing capacity. The NREL study assumes that the Tesla Powerwall can run for 15 years without significant loss of energy storage and release, with 5,475 charges and discharges during that period.
The lithium-ion battery also charges more quickly at higher voltages. Although lead acid batteries can take up to 16 hours to fully charge, even the slowest lithium-ion battery can be fully charged in about four hours. In terms of weight. The lithium-ion battery used in residential energy storage systems is not light, but it is much lighter than lead acid. The 13.5 kwh Tesla Powerwall weighs about 278 pounds, the 1.7 kwh Lead acid battery weighs about 132 pounds, and a Lead acid battery with the same capacity as the Powerwall would weigh over 1,000 pounds. All in all, lithium-ion battery has an advantage over lead acid batteries in energy storage applications, and will become more and more widely used.