Peak Shaving with Solar-Log™

Sustainability that pays off

Hotels, supermarkets, or DIY stores have a high electricity demand due to their large number of consumers. Easily, this could be completely or partially covered by using a photovoltaic system and an electricity storage system, which is increasingly being used by their owners. These institutions have another problem however. Due to the high number of consumption points, the base load which these consumers permanently take from the network is very high. Furthermore, consumption peaks can occur due to switch-on processes or temporal operation of other high consumers. In order to be able to serve these consumption peaks or load peaks, capacities must be kept available in the infrastructure of our energy network. This, in turn, must be paid for by the consumers in the form of a separate capacity charge. Depending on the region and network operator, this capacity charge is between €40 and €180 per kilowatt (kW) provided. This performance price can very quickly become a high proportion of the total electricity costs.

Peak shaving as a diagram

Avoiding Load Peaks with Solar-LogTM

The power of the sun in the form of a PV system can also help here! By using a PV system in combination with a large storage tank and a clever control system, the connected load at the grid interconnection point can be reduced. Solar-LogTM has already developed a solution for this problem. Due to the existing high compatibility with various components in the market, it is possible for us to regulate a variety of components with each other. This is especially true for PV systems and the inverters installed in them.

To the compatibility database

Peak Shaving

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By using the Solar-Log control system for peak shaving and load management, the PV system can be used in conjunction with a qualified commercial storage system. This reduces the connected load at the grid connection point and continues to use sustainable energy for e-mobility. By using the Solar-Log Base, the user is able to monitor his PV system and realize a grid-compliant connection to the medium-voltage grid. Moreover, it is also possible to include an e-charging infrastructure and a commercial storage unit in the intelligent load management with the new control.

Case Study

Customers know only one point when it comes to energy costs:

It is too expensive! In many cases, the energy price is still known, i.e. what I pay per kWh of electricity. The power price, as a component of the basic costs, usually disappears unnoticed in the end-of-year bill. In simple terms, this means that the commercial enterprise should keep an eye on a cost block in addition to the energy price, which is calculated according to the following formula: Max. purchased power x agreed power price.

To make it even clearer: Commercial enterprise with a peak load of 115kW (i.e. a medium-sized hotel) Agreed capacity price from the utility company = 85 EUR/kW.

Results in costs for a capacity price of 9.775kW per year

The ways which costs for the performance price change when installing additional consumers (i.e. e-charging infrastructure), and using a commercial storage to cap peak loads can be tracked in detail in the case study we provided.

Download case study

Is it even worth it?

There is a lot of hidden optimization potential here for commercial enterprises. The capacity charge covers the fixed costs of the network operator to keep the agreed capacity available for the connected business at all times. In other words, the network operator transfers part of their costs for the infrastructure provided to the service user if the latter regularly or irregularly demands higher services from the network. If the power price is not charged as a component of the basic costs, the power supplier transfers these costs to the energy price and the customer pays for these expenses through his consumed kWh in the year.

By using the Solar-Log solution for peak shaving, you can reduce the costs for the power price and ensure free capacities in the infrastructure - all with the support of Sonnenkraft and Solar-LogTM.

By using the Solar-Log hardware, the following requirements for this type of project with a hardware construction kit can now be implemented by the user:

  1. The planned requirements to avoid peak loads and thus actively reduce the power price.
  2. The required regulations for grid connection for the photovoltaic system.
  3. Monitoring the total yields for the plant.

If a separate solution were to be implemented for each of these tasks, the implementation requirements and the expenses for the hardware with installation would increase significantly.