A shared EV charger for your residential estate

How a shared charger works

The housing community installs one or several charging stations in a designated area — in an outdoor car park or in the garage. They can be used by all authorised residents, not just the owner of a single parking space.

In the Domena Power system, a resident checks in the app whether a connector is free, drives up, starts the session with one tap and sees the energy drawn and the cost in real time. The system assigns every session to a specific person and unit, so billing is just as precise as with a private charger.

Rotation: how to stop cars hogging the charger

The biggest challenge of sharing is cars that stay parked at the charger after they are fully charged. That is why it pays to agree clear rules from the start:

• In-app notifications when charging finishes — the driver knows when to move the car.
• An idle fee after charging ends — the system can charge for every minute the car stays parked, which is an effective incentive to free up the space.
• Connector status view — other residents can see in the app when the charger becomes free.
• Usage rules — e.g. charging only up to a set battery level or for a set time during peak hours.

How many points does an estate need

An electric car in everyday use does not need to charge every day — with typical mileage, a few hours of 11 kW charging every few days is enough. That is why one point can serve several drivers, and a station with two connectors correspondingly more.

A well-designed installation takes the target number of points into account. You start with one or two stations and add more as the number of cars grows — without repeating the assessment and design.

The number of residents per point depends on their mileage, charger power and the rotation rules. We prepare a recommendation for each specific estate.

A shared charger vs a point at every space

Let’s compare ten residents with electric cars. Ten individual chargers mean ten devices, ten cable routes and ten installations — each usually costing 3,500–6,000 zł with materials, plus the charger itself. Two shared twin-socket stations cost a fraction of that, with one cable route and one assessment.

• Installation assessment and design: 3,000 zł net (3,690 zł gross) for the first point and 330 zł net (405.90 zł gross) for each additional one.
• Billing system: 30 zł net (36.90 zł gross) per month for the first charger and 10 zł net (12.30 zł gross) for each additional one, with no commission on energy.
• Lower power demand — a few points with load management instead of a dozen or more that need to be powered at the same time.

Billing with no cost to the community

Every shared charger should have a MID-certified meter. The system assigns the energy used to the resident who charged, and the property manager downloads a per-unit report from the panel and issues debit notes. The price per kWh should reflect the housing community’s actual energy cost — that way nobody pays for someone else’s charging.

What needs to be prepared

• A resolution of the housing community — a shared charger is common infrastructure, not a point for individual use.
• An installation assessment and design, including an assessment of available power and fire-safety conditions.
• UDT inspections — a station used to provide a paid charging service to many users is subject to inspection by UDT (Poland’s Office of Technical Inspection).
• Access and rotation rules, and the price per kWh, which is set in the system.