Determining the optimal energy storage capacity for photovoltaic power generation hinges on several critical factors, including 1. the local solar production potential, 2. the average energy consumption patterns of the target facility or household, 3. the geographical and climatic conditions influencing solar irradiance, 4. the anticipated return on investment, and 5. advancements in energy storage technologies and their associated costs.
[pdf] Austria has launched a new subsidy scheme for residential batteries. The Ministry of Climate Action and Energy is providing a total of €15 million ($16.1 million) to support the installation of new storage systems and the expansion of existing systems used in combination with renewable energy.
[pdf] The capacity is typically measured in kilowatt-hours (kWh) or megawatt-hours (MWh), indicating how much energy a battery can store and deliver over time. For home applications, a battery pack might range from 5 kWh to 20 kWh, which is sufficient to power essential loads for several hours.
[pdf] 
