The "Virtual Metering Point" meter type allows a virtual metering point to be set up. Each virtual metering point consists of a consumer and a producer. Consumption and generation are balanced on a quarter-hourly basis. A consumer draws its electricity from the grid. The cFos Charging Manager takes into account the adjustable price information (fixed price or variable tariffs). If there is a generator in the system, the electricity generated can be (proportionately) allocated to this consumer. Example: The consumer uses 10 kWh in the quarter-hour interval and the solar system generates 3 kWh during this time. The Charging Manager then calculates 7 kWh of grid consumption and 3 kWh of PV electricity for this virtual measuring point. With such virtual measuring points, individual participants in the system can be billed with a configurable solar share. This can be useful for tenant electricity or separate billing of wallboxes, for example. Virtual metering points are designed so that you can bill several consumers in connection with one or more generators.
Legal questions (e.g. whether you need to become an energy supplier) must be clarified with a specialised lawyer. We cannot provide any information on this.
| Formula for consumption meters | The kWh of the meter that measures the actual consumption of the measuring point must be entered here as the formula, e.g. M5.import_wh. |
| Formula for producer counters | The kWh of the meter that measures the generation to be credited for this consumer must be entered here as the formula, e.g. M7.import_wh. |
| Share of generation (values from 0 to 1) | Typically 1 if all virtual measuring points involved in this generation meter are to have the same share of solar power. Otherwise, individual consumers can also have a smaller share. |
| Factor for grid procurement costs | Typically 1. if you want to charge an additional levy, you can enter 1.1 for a 10% surcharge, for example. |
| Costs of electricity generation | Specified in cent per kWh. This is where you set the price for the electricity generated by your system. |
| Priority | Here you specify the priority with which the generation electricity is distributed to the virtual metering points. Virtual measuring points with higher priorities are considered first. |
| Mail recipient | If you enter a valid e-mail address (and your Charging Manager is configured to send e-mails), this recipient will receive the monthly billing data as a .CSV file. |
Virtual measuring points also contain a "Consumption data" button in the settings. The consumption of the current Monday, the previous month and the same month of the previous year would be displayed here.
We have also added this function to wallboxes and under the user settings because this cost information could also be of interest for charging points.
The cFos Charging Manager overlays consumption and generation every quarter of an hour. It logs the corresponding data in a .CSV file for verification purposes. You can download this under "Configuration" -> "Files" and delete it if necessary.
The generated electricity is distributed as follows: The Charging Manager considers virtual metering points with the highest priority first and distributes the generation (kWh) to the loads according to the set "share of generation". The remaining energy is then distributed to virtual measuring points with the second-highest priority, and so on.
6 kWh were generated in the interval, virtual measuring point 1 (VP1) has a share of generation of 1 and consumption of 5 kWh. Virtual measuring point 2 (VP2) has a share of generation of 1 and consumption of 3 kWh.
The Charging Manager splits the generation as follows: VP1 and VP2 receive 3 kWh. VP1 still draws 2 kWh from the grid, VP2 still 0 kWh. This means that the generation is completely used up. Virtual metering points with a lower priority are not credited with any generation.
If VP 2 in the above example has a "share of generation" of 0.5, the distribution is as follows: VP 1 receives 4 kWh, VP 2 receives 2 kWh. VP1 still receives 1 kWh from the grid, VP2 still receives 1 kWh.
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