| http://www.w3.org/ns/prov#value | - It is known that storage batteries of many types, e.g., lead-acid types commonly used in vehicles, are a means of storing electrical energy with a typical optimum efficiency of 72% during surplus generating capacity periods, and then delivering stored power with typical optimum efficiency of 72% during peak demand periods to supplement total generation capacity at a net efficiency of about 51.8%,
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