Four new chargers can look like a modest addition to a parking area. If they all operate while the building is already at its peak, they can materially change the electrical load profile. The charging project is therefore an energy-management decision as well as a parking amenity.
A good plan starts with who needs to charge, how much energy they need, and when vehicles leave. Combine those requirements with the building's measured demand and a professional electrical assessment before choosing equipment or promising savings.
In this guide
Define the charging service
Employee vehicles parked all day, customer vehicles visiting briefly, and fleet vehicles with fixed departures need different charging plans. Estimate daily energy needs and available dwell time. A charger rating describes potential power, not guaranteed daily energy delivery.
Clarify ownership, payment, access, and support responsibilities. If a fleet must leave with a minimum charge, record that requirement explicitly. Demand controls that ignore departure commitments will be bypassed when they disrupt operations.
Read the existing load profile
Review the building's interval demand across relevant seasons. Mark HVAC startup, production shifts, refrigeration cycles, and other large loads. Identify times when charging would overlap with the highest existing demand rather than assuming overnight is always the lowest-load period.
Check the account tariff for the measurement interval, demand charges, and any ratchet or time-based rules. A time-of-use energy rate and a demand charge describe different costs. Moving charging to a cheaper energy period may still establish a new demand peak.
Confirm electrical capacity professionally
Have qualified electrical professionals assess the service, distribution equipment, protection, installation requirements, and applicable approvals. Historical low demand alone does not establish that a panel or circuit can accept additional charging load.
Decide whether load management is part of the electrical design and which approved equipment supports it. Clarify what happens when communications fail. Safe system behaviour and required capacity depend on the installation, so keep those decisions with the designer and installer.
Evaluate a shared power limit
Managed charging can allocate an approved power budget across vehicles instead of allowing every charger to draw its maximum simultaneously. The control strategy may respond to building load, session priorities, or departure times. Assess what the proposed equipment actually supports.
The Alternative Fuels Data Center's charging infrastructure guidance is a useful starting point for infrastructure planning. At your building, ask the supplier to demonstrate how its controls handle a full car park and a high-load HVAC period.
Check a realistic energy window
In an illustrative scenario, four chargers capable of 7.2 kW each could add 28.8 kW if all operate at full power. A shared 14.4 kW charging budget over an eight-hour window supplies up to 115.2 kWh at the charging equipment before relevant losses and operating constraints.
If the vehicles together need 80 kWh, the window may be adequate. It still requires checking individual departure times, power allocation, vehicle acceptance, and actual losses. A site cap that works for today's vehicles may not work for a larger fleet.
Model the bill separately from the hardware
For illustration, an additional billable 20 kW at an assumed $12/kW monthly demand charge would add $240 for that component. This is not a Canadian tariff quote. Use the actual utility rules and compare the combined building-and-charging demand, not the charger's nameplate alone.
Include energy, service fees, payment processing, maintenance, and installation costs in the business case. Avoid counting the same reduction as both an avoided service upgrade and recurring bill savings without showing how each benefit is established.
Pilot, measure, and expand
Start with a limited deployment and track energy delivered, charging completion, building peaks, and support issues. Test busy days rather than relying only on quiet commissioning conditions. Give the operations team a clear escalation route when vehicles cannot meet departure needs.
Review the plan when occupancy, tariffs, or fleet size changes. Charging can be a useful service, but its long-term operating cost depends on how the new load fits the building's existing pattern.
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