You wish to store 2.00 MWh as an emergency power supply for a “big-box” store. If the gross energy storage density of the battery is 425 kJ/liter how big is the storage battery in m³? If the density of the battery averages 2.5 × 10³ kg/m³ is this reasonable compared to other batteries on the market? See Figure 8.6.

Figure 8.6.

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1,000 Lead-acid 100 Fuel Cells NİMH 10 Ultra- Conventional сарacitors batteries 1 Conventional 0.1 сараcitors 0.01 10 100 1,000 10,000 Power Producing Density. W/kg Energy Storage Density, Wh/kg