EV Charging for Corporate Fleets: AC vs DC, Depot Sizing and Supplier Questions
Size depot charging from dwell time, not charger ratings: fleets that park overnight are usually served fully by AC charge points at 7–22 kW with Type 2 connectors, and need DC fast charging (CCS2, 50 kW+) only for multi-shift vehicles. Add load management so your grid connection is sized for real simultaneous demand instead of the sum of nameplate ratings.
Do corporate fleets need AC or DC charging?
Most depot-based fleets should plan around AC charging at 7–22 kW, adding DC fast charging (50 kW and above) only for vehicles that genuinely cannot wait. The deciding factor is dwell time: a van parked from 6 pm to 6 am has twelve hours to recover energy, so even an 11 kW AC point restores well over 100 kWh — more than most light commercial EV batteries hold. DC fast charging earns its far higher cost only where vehicles run multiple shifts, or where a midday top-up decides whether the route finishes.
| Factor | AC charging (7–22 kW) | DC fast charging (50 kW+) |
|---|---|---|
| Connector in the Gulf | Type 2 | CCS2 |
| Best fit | Parked 6+ hours overnight | Multi-shift vehicles, quick turnarounds |
| Hardware and installation | Low cost, simple electrical work | Costly power electronics, often civil works |
| Site electrical impact | Modest, spread across the night | High peak demand per unit |
| Battery wear | Gentle | Heavy daily fast charging accelerates degradation |
| Scaling to a large fleet | One point per bay is realistic | Usually a shared, scheduled unit |
For most fleets: one AC point per overnight bay, plus one or two shared DC units.
How do we size depot charging from fleet duty cycles?
Size from energy, not charger ratings: daily energy need is daily distance times consumption, and required power is that energy divided by real hours at the depot. Four steps:
- Daily energy per vehicle. Multiply route distance from your telematics by the manufacturer's consumption figure for the exact model, with a margin for summer air-conditioning.
- Dwell window. Count the hours the vehicle reliably sits at the depot. Ten quiet overnight hours deliver more energy than one hour on a fast charger.
- Power per vehicle. Divide energy by dwell hours. A van needing 60 kWh across a 10-hour window needs only 6 kW — inside a basic AC point.
- Fleet diversity. Vehicles do not all arrive empty or charge at once, so the site's true peak sits far below the sum of charger ratings — the headroom load management exploits.
The output is one number: peak site demand in kVA, for your electrical consultant and utility. Size trenching, cable containment, and panel space for the full future fleet even if chargers arrive in phases — digging the same trench twice costs more than sizing it once.
How can load management avoid a grid-connection upgrade?
Load management shares your site's existing electrical capacity across all charge points, so the connection is sized for real simultaneous demand instead of the sum of nameplate ratings. Without it, twenty 22 kW points look like 440 kW on paper — capacity few sites have spare. Two levels exist:
- Static load management caps total charging at a fixed limit agreed with your electrical engineer.
- Dynamic load management reads the building's live consumption and gives charging the remaining headroom — filling the overnight valley when chillers and offices wind down.
Add scheduling on top: vehicles that leave earliest charge first. If managed charging still exceeds the connection, a battery energy storage system (BESS) can buffer the peaks — but treat it as a last resort, since it adds cost and maintenance.
Which charging standards matter in the Gulf?
Specify Type 2 connectors for AC and CCS2 for DC — the standard pair for vehicles sold into 230/400 V, 50 Hz markets, the Gulf included. In IEC 61851 terms, depot charging is Mode 3 AC through a dedicated charge point; fast charging is Mode 4 DC, where the charger feeds the battery directly. CCS2 extends the Type 2 inlet with two DC pins, so one vehicle inlet accepts both. Two cautions: some imported trucks and buses ship with GB/T inlets rather than CCS2, so confirm the inlet on the exact variant before ordering chargers; and require OCPP (Open Charge Point Protocol) support, so charge points and management software can come from different vendors.
How do EV charging costs compare with fuel?
Per kilometre, electricity is usually the cheaper energy source, but the honest comparison depends on your tariff structure — model it with your own bills, not a generic figure. The physics favours the EV: electric drivetrains convert over 77% of grid energy into motion at the wheels, against roughly 12–30% for petrol engines (U.S. Department of Energy). What actually moves the answer:
- Tariff category and time-of-use windows. Overnight depot charging usually lands in the cheapest hours.
- Demand charges. A badly timed DC session can set a monthly peak costing more than the energy itself.
- Where you charge. Depot AC is almost always cheaper per kWh than public DC networks.
- Maintenance. No oil changes, fewer moving parts, and regenerative braking that cuts brake wear.
No prices appear here on purpose: tariffs and pump prices move, while the drivers above decide your outcome.
What should we ask charge-point suppliers?
Ask about openness, heat tolerance, and service before price — a cheap charger with no local support is the expensive option. Use this checklist in your quotation request:
| Question to ask | What a good answer looks like |
|---|---|
| Is the unit OCPP-compliant (1.6J or 2.0.1)? | Yes — proven with more than one management platform, no lock-in |
| Operating temperature range and derating behaviour? | Rated for Gulf summers (~+50 °C), published derating curves, IP54 or better |
| Does it support load management? | Dynamic, driven by a site meter — not just a fixed cap |
| Warranty, response times, local service? | Trained technicians and spare parts in-country, response times in writing |
| How is energy metered and reported? | Per-point metering with exportable reports, so cost lands per vehicle or department |
| What is the upgrade path? | Over-the-air firmware updates; room to add points on the same system |
How does ENTEK help electrify your fleet?
ENTEK gives your team one place to request quotations for charging equipment and installation from verified suppliers, compare the offers against the questions above, and manage the resulting orders across all your branches. Electrifying a fleet is as much a procurement exercise as an engineering one — chargers, civil works, load management, service contracts, often across several sites — so keeping every depot on the same specification, with the same record behind every purchase, is what keeps a phased rollout under control.
Frequently asked questions
- Do we need DC fast charging at our depot?
- Usually not for vehicles that park overnight. If a van sits at the depot for eight hours or more, an AC point at 7–22 kW replaces its daily energy comfortably. Reserve DC fast charging for multi-shift vehicles, long-distance runs, and one shared backup unit for the days a route overruns.
- How do we work out the charging power each vehicle needs?
- Divide the vehicle's daily energy need — daily distance multiplied by consumption, plus a margin for air-conditioning — by the hours it reliably sits at the depot. A van needing 60 kWh across a 10-hour overnight window needs only 6 kW, well inside a standard AC charge point.
- What is the difference between static and dynamic load management?
- Static load management caps total charging at a fixed limit agreed with your electrical engineer. Dynamic load management reads the building's live consumption and gives charging whatever capacity is left, so vehicles use the overnight headroom instead of forcing a grid-connection upgrade.
- Which charging connectors should we specify in the Gulf?
- Type 2 for AC charging and CCS2 for DC fast charging — the standard pair for vehicles built for 230/400 V, 50 Hz markets. Confirm the inlet on the exact vehicle variant before ordering chargers, because some imported trucks and buses arrive with GB/T inlets instead.
- Is charging an electric fleet cheaper than fuelling petrol or diesel vehicles?
- Per kilometre it usually is, because an electric drivetrain wastes far less of its input energy, but your tariff decides the size of the gap. Model it on your own bills: check the tariff category, the time-of-use windows, and any demand charge a badly timed fast-charge session could trigger.