Electrical energy is difficult and expensive to store. This is a problem for the generation of photovoltaics and other electrical resources. Traditional lead-acid batteries are heavy and have a low energy density; that is, they can only store energy in moderate amounts per unit of mass or volume.
The typical lead-acid battery array is enough to save a few days of electricity for an average home which will cost around $ 5,000 and weigh 3 to 4 tons. All components for electric cars are available, but, as mentioned earlier, battery technology limits how far they can charge. You can get more information regarding lithium-ion batteries via http://nuenergystorage.com.
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Other battery types also have weaknesses. Metal-gas batteries, such as zinc-chloride cells, use materials that are inexpensive and have relatively high energy densities, but have a shorter lifespan than other types. The sodium-sulfur battery has considerable potential for large-scale storage.
They need an operating temperature of around 300 degrees Celsius and are expensive to produce. Alkali-metal batteries have high storage capacity but are even more expensive. Lithium batteries have a very long life and save more energy than other types, but are the most expensive.
Recent advances in thin film technology may be promising for energy storage in the future but often require rare toxic elements which are expensive and dangerous. Another strategy is to save in a form that can be converted into electricity when needed.
Hydro-pump storage involves pumping water into an elevated reservoir when excess electricity is available. Water is released to flow back through a turbine generator when extra energy is needed.