Calculation of electricity for charging in housing associations / condominiums and businesses

The calculator makes it easy to calculate the need for electricity based on the number of charging stations / points, and how much power each individual can get at the same time when charging in larger charging facilities, such as in housing associations / condominiums / companies. Note that the calculator does not take into account functions in charging systems that have load and phase balancing. Our experience shows that it is very rare for 20 cars to charge at the same time per 63A course, but some people want faster charging and the calculator allows you to simply calculate the number of charging stations per course based on how much power (kW) should be available at the same time (simultaneity factor).

Our general recommendation is that one course of 63A/3-phase will cover up to 15-25 charging stations using intelligent charging systems that automatically balance load and phase between the charging stations for optimal utilization of the available capacity.

Performance Free

The housing association and condominium may risk paying high power charges to the grid owner due to electric car charging. The power charge depends on the course size and the total power and varies between network owners, however the common denominator is that a higher total charging speed (total power) entails a higher power charge.

The majority of housing associations and condominiums currently have good electricity capacity, as a minority of residents charge their cars. If you do not adjust the total power down, it means that the residents get charged quickly, but it also entails high power charges. The purpose of a charging facility should be to charge quickly enough so that everyone gets a fully charged car every morning, not as quickly as possible at any price.

Hafslund, which is Norway's largest grid owner, calculates the power charge based on the hour in the last month with the highest power. The performance fee varies throughout the year, but is on average approximately NOK 100 per kilowatt per month.

The limit for the power charge for a housing association or condominium depends on the electricity network (but can also vary with the network companies):

Power Grid Number of Amps Effect
230V / IT-net 125A 50 kW
400V / TN-net 80A 55 kW


Example of Calculation of the Power Charge

  • Network Owner: Hafslund
  • Power Grid: 230V / 3-phase
  • Power / number of amps for electrical vehicle charging: 200A
  • Total available effect: 200A x 230V x 3 phases = 80 kW
  • Potential performance fee per month*: 80 kW x 100 kr = 8000 kr

The housing association or condominium risks an impact fee from the grid owner of NOK 96,000 a year. Alternatively, up to NOK 4,800 per year per user if there are a total of 20 user of the facility.

*With less than 80A / 400V and 125A / 230V, you are exempt from the power tax

The solution to the challenge

We offer charging solutions / charging facilities that manage and optimize the available capacity so that you either avoid or reduce the power charge without compromising functionality and user experience. This way, everyone gets their vehicle fully charged every morning and low usage costs (power tax). This means that there can be large sums to save for your housing association or condominium.



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