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Considere un inversor con una potencia nominal de 500 vatios y una eficiencia del 90%. La potencia del inversor se puede calcular como: [ Pi = frac {500 times 90} {100} = 450 text { vatios} ].
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Electricity can be stored directly for a short time in capacitors, somewhat longer electrochemically in, and much longer chemically (e.g. hydrogen), mechanically (e.g. pumped hydropower) or as heat. The first pumped hydroelectricity was constructed at the end of the 19th century around in Italy, Austria, and Switzerland. The technique rapidly expanded during the 1960s to 1980s,.
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