How Should Project Teams Profile Electrical Load Before Selecting Commercial EV Chargers?

Before selecting charger quantity and power level for commercial ev charging, project teams should build a load profile from dwell time, vehicle mix, arrival patterns, and simultaneous charging probability — then translate that curve into AC/DC architecture and grid capacity.

This selection guide complements location planning in commercial EV charging station site selection and business framing in EV charging station business: a complete guide. For civil and procurement sequencing after demand is modeled, use the commercial EV charging infrastructure planning guide.

Part 1. What is load profiling in a commercial EV charging project?

Load profiling estimates how much charging power a site needs, when it needs it, and how concentrated demand becomes across the day. It connects parking behavior to transformer sizing, feeder design, charger count, and operating cost.

Without a profile, teams often oversize DC power for long-dwell workplaces or undercount simultaneous demand at fleet depots.

Important: A technically oversized design can still fail commercially if utilization and tariff exposure are not modeled together. (IEA transport commentary)

Part 2. Which inputs must be collected before any power calculation?

Accurate profiling starts with use-case definition, not catalog pages.

From the field: Facility teams often say they “do not know how many cars will charge at once.” Start with conservative simultaneous factors and refine after 60-90 days of session data. (fleet charging project factors)

Part 3. How do you build a time-based charging demand curve?

Map expected sessions to clock time for a representative weekday and, if needed, a weekend day.

Example pattern for a workplace site:

Part 4. How should simultaneous load and diversity be estimated?

Not every connected vehicle draws nameplate power at the same time. Diversity factors help — but fleet depots usually need more conservative assumptions than workplace parking.

Tip: Document the diversity factor assumption in the RFQ. Suppliers can only recommend load management and power sharing if the target site cap is explicit. (OCPP EV charger guide)

Part 5. When should a site use AC, DC, or a mixed architecture?

The load profile should drive technology choice — not the reverse.

For technology fundamentals without repeating a full AC vs DC article, route readers to existing site content and keep this page focused on demand modeling.

Part 6. Which XYDF platforms match common commercial load outcomes?

After the profile is documented, map outcomes to published XYDF platforms under Produits and the Solution de recharge pour VE commerciaux pillar.

Submit the completed profile, diversity assumptions, and target tariff windows when requesting a proposal through Contacter le fournisseur de bornes de recharge pour VE.

Part 7. What are the fit boundaries for this load profiling guide?

This guide supports commercial charger selection and electrical planning inputs. It does not replace:

• Utility interconnection studies or formal grid impact reviews
• Cable sizing, protection coordination, or construction drawings
• Payment network certification or tariff negotiations
• Traffic engineering or parking circulation design
• Fleet route-energy modeling for heavy-duty duty cycles

Fit boundary: If arrival data, vehicle mix, or simultaneity assumptions are unknown, publish a staged design with monitoring points rather than locking maximum power on day one.

FAQ

What is commercial EV charging load profiling?

It is the process of estimating when charging demand occurs, how many sessions overlap, and how much power the site must deliver across the day.

What data should be collected first?

Define user group, dwell time, vehicle mix, arrival state-of-charge, operating hours, and a realistic EV adoption horizon before calculating kW.

How is simultaneous load different from total installed power?

Installed power is the sum of charger nameplates. Simultaneous load is the power actually drawn at the same time — usually lower except in fleet depots.

Should workplaces default to AC chargers?

Long-dwell workplaces often start AC-heavy because vehicles remain parked long enough to deliver useful energy at lower per-port power.

How do demand charges affect charger design?

If tariff periods penalize peak demand, the profile should identify whether software load management can cap site kW without harming user experience.

When is staged deployment better than full build-out?

When adoption forecasts are uncertain or grid capacity is limited. Stage ports, monitoring, and feeder capacity for a second phase.

What should be sent to an EV charger manufacturer?

Send the demand curve, diversity assumptions, target connector standards, OCPP/backend requirements, and site kW cap so the supplier can propose AC/DC mix and load management.

Références

• IEC 61851-1 Electric vehicle conductive charging system
• IEA Electric vehicles topic page
• Open Charge Alliance — OCPP overview

Related articles

• Sélection de site pour une borne de recharge de VE commerciale : prenez une longueur d'avance
• Guide de planification de l'infrastructure de recharge des véhicules électriques commerciaux