# Photovoltaics - Ratio Storage-Power

Calculator for the ratio of the capacity of an energy storage and the nominal power of a photovoltaic system. Storage capacity is the maximum energy content of a battery. This is often given in kilowatt hours (kWh), the symbol for energy is E. The nominal power of a photovoltaic system usually is given in kilowatts (kW), the symbol for power is P. The unit of the ratio is hours. So the ratio tells, how long at maximal power the battery takes to load from totally empty to totally full, or for how many hours electricity can be stored.

The ratio is a theoretical value, the practical charge time is longer. Please enter any two values, the third value will be calculated. r=E/P

Example: a battery with the storage capacity of 1.5 MWh is connected to a photovoltaic system with a nominal power of 20 kW. Then it can store for 75 hours at peak power. The sun doesn't shine for 75 hours continuously, so the real duration is higher. Nonetheless, the ratio is given as 75.

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