A 500 kW battery storage system is a battery energy storage system with a power rating of 500 kilowatts. Systems of this size are mainly used in commercial and industrial settings to shave load peaks, use self-generated solar power and relieve the grid connection. A 500 kWh storage system is often mentioned in the same breath – but that is a different value.
500 kW describes the power: how much electricity the system can charge or discharge at any given moment. 500 kWh describes the capacity: how much energy is stored in total. The ratio of the two determines the storage duration:
| Configuration | Storage duration | Typical focus |
|---|---|---|
| 500 kW / 500 kWh | approx. 1 hour | short, high load peaks |
| 500 kW / 1 MWh | approx. 2 hours | peak shaving over longer periods, PV self-consumption |
| 250 kW / 500 kWh | approx. 2 hours | self-consumption and moderate load peaks |
The right configuration depends on the site’s load profile: the height and duration of peaks, PV surpluses and the available grid connection capacity.
The Voltfang 3 commercial storage system provides 255 kWh capacity and 125 kW power per unit and can be scaled up to 4 MWh via AC coupling. Mathematically:
The system is controlled by an energy management system that analyses load profiles, electricity prices and on-site generation and schedules charging and discharging automatically.
A system in this power class sits in the range of a powerful commercial battery storage system or a smaller industrial battery storage system. It is large enough to noticeably reduce demand charges and increase self-consumption, yet compact enough to be installed directly on site, for example in outdoor cabinets.
The cost of a 500 kW or 500 kWh system does not depend on size alone, but also on power electronics, installation, grid connection, safety concept and energy management. A reliable price can only be given in the context of a specific project. Getting started without upfront investment is possible through leasing.
The next size up is described in our article on battery storage with 1 MW / 1 MWh.
A 500 kW battery storage system is a battery energy storage system with a power rating of 500 kilowatts that stores and supplies electricity flexibly in commercial and industrial applications.
500 kW describes the power, i.e. how much electricity the system can deliver at any given moment. 500 kWh describes the capacity, i.e. how much energy is stored. A system with 500 kW and 500 kWh can theoretically discharge at full power for one hour.
With the Voltfang 3 commercial storage system (255 kWh, 125 kW per unit), four units theoretically provide 500 kW with around 1 MWh of capacity. For around 500 kWh of capacity, two units with 250 kW are sufficient.
It is used to reduce load peaks, increase self-consumption of solar power, lower electricity costs and relieve the grid connection.
For medium-sized commercial and industrial companies with noticeable load peaks, larger PV systems or planned charging infrastructure.
The cost depends on capacity, power, installation, grid connection and energy management. A reliable price can only be given in the context of a specific project. Voltfang provides a free initial assessment based on the site’s load profile.
Yes. A 500 kW battery storage system can store surplus solar power from a PV system and make it available to the company later.
