E-Mobility Infrastructure: Preparing South African Industries for Electric Fleets
South Africa's shift to electric fleets is accelerating, but most sites aren't electrically ready. What plant engineers need to know before EVs arrive.
South Africa's commercial vehicle sector is at an inflection point. Global OEMs—Volvo, Mercedes-Benz, MAN, and others—are beginning to introduce electric trucks and light commercial vehicles into their African model lines, and several large South African logistics operators have already placed orders for pilot fleets. Mining houses are evaluating battery-electric and trolley-assist haul trucks. Port operators in Durban and Cape Town are testing electric yard tractors.
For the companies that will receive these vehicles, the question is less "should we go electric?" and more "are our sites electrically ready for it?" In most cases, the honest answer is: not yet—but the gap is closable with the right engineering approach.
This article sets out what industrial facilities need to understand about EV charging infrastructure, the electrical upgrades that are typically required, and how to sequence a site readiness programme before your first electric vehicle arrives.
Why Industrial E-Mobility Is Different
Consumer EV charging is a largely solved problem. A 7 kW home wallbox or a 50 kW DC fast charger at a shopping centre involves relatively simple electrical work and minimal impact on the building supply.
Industrial e-mobility is a different category of problem. Consider the charging requirements for a 100-vehicle electric light commercial fleet:
- A 22 kW AC charger per vehicle, charged overnight across an 8-hour window, requires approximately 2.75 MW of simultaneous demand if all vehicles charge without coordination.
- A single 150 kW DC fast charger imposes a demand spike that can exceed the contracted capacity of a small-to-medium industrial site in one plug event.
- A fleet of 20 battery-electric trucks with 400 kWh packs, charged across a 10-hour window, requires a sustained 800 kW draw—comparable to adding a small manufacturing facility to the site supply.
These are not extraordinary numbers for a logistics hub or a bus depot. But they represent a step-change in electrical demand that most existing sites were not designed to carry.
The Electrical Readiness Assessment
Before any charging infrastructure is specified or procured, a site readiness assessment should establish four things:
1. Available Grid Capacity
Start with the current Notified Maximum Demand (NMD) from Eskom or the local municipality, and compare it with the projected charging load. In most cases, industrial sites will need to either negotiate an NMD increase—a process that can take six to eighteen months and may require new metering and protection equipment—or implement load management strategies that keep EV charging within the existing NMD.
Many sites are already pushing their NMD, particularly with embedded solar PV connected. Adding unmanaged EV charging can trigger penalty tariffs or, in extreme cases, supply interruptions. This must be modelled before any chargers are installed.
2. Distribution Capacity
Even where the incoming NMD is sufficient, the site's internal LV distribution may be the constraint. Switchboards and cable routes designed for a specific load in the 1980s or 1990s may not be rated to carry an additional 500 kW of EV charging load through existing busbars and cable runs.
A thermal audit of the main switchboard, submains cables, and distribution boards is essential. Ring main units (RMUs) feeding the relevant building areas must be assessed for capacity and protection coordination.
3. Power Quality
High-power DC fast chargers introduce non-linear loads that generate harmonic distortion. In a site already running variable-speed drives, UPS systems, and rectifiers, the cumulative harmonic distortion can exceed limits set by SANS 61000-2-4, causing nuisance trips, measurement errors, and premature equipment failure.
A power quality survey—or at minimum, a harmonic modelling exercise—should precede large-scale DC charging installation, particularly in manufacturing environments where sensitive control systems are present.
4. Protection Coordination
Every new EV charging circuit must be protected against overcurrent, earth fault, and, where applicable, arc flash. The protection design must coordinate with existing upstream devices so that a fault on a charging circuit trips only the local protection, not the entire site feeder.
For DC fast chargers above 100 kW, this coordination exercise is non-trivial. DC fault currents behave differently from AC, and the switchgear in the charger's AC supply must be selected and set accordingly.
Charging Infrastructure Options
South African industrial sites will typically need a combination of charging technologies, depending on fleet type and operational pattern.
AC Level 2 Charging (7–22 kW)
AC wallboxes are appropriate for light commercial vehicles—vans, bakkies, passenger cars—that return to depot overnight and can charge across a 6–12 hour window. They are relatively inexpensive (R8 000–R25 000 per unit installed) and impose modest individual loads. The key design challenge is aggregation: ten 22 kW chargers is a 220 kW load, and that load must be managed intelligently.
DC Fast Charging (50–350 kW)
DC fast chargers are used for vehicles that need to be back in service quickly: inter-city routes, shift-change charging, or opportunity charging during driver breaks. They are significantly more expensive (R200 000–R800 000 per unit installed, depending on power level) and impose large, near-instantaneous loads on the supply.
For South African sites, 150 kW DC chargers are currently the most practical choice for heavy-duty applications—fast enough to provide meaningful range in a 30–45 minute break, and available from established CCS2 and CHAdeMO-compatible suppliers.
Pantograph and Overhead Charging
For bus depots and some heavy industrial applications, overhead pantograph charging offers the highest power levels (up to 600 kW) without requiring the driver to handle a plug. Several South African metropolitan bus operators are evaluating this technology as part of fleet electrification programmes. The infrastructure cost is high and the civil works are significant, but for large bus fleets the total cost of ownership is competitive.
Load Management: The Non-Negotiable Requirement
For any industrial fleet above five vehicles, static (unmanaged) charging is not viable. An energy management system (EMS) or charge management system (CMS) must be installed to:
- Prioritise charging based on vehicle departure schedules and state of charge.
- Limit site demand to stay within NMD thresholds and avoid penalty charges.
- Integrate with solar PV and BESS to shift charging to periods of peak generation or low-cost grid supply.
- Provide reporting for cost allocation, duty of care, and ESG metrics.
South African installations benefit particularly from solar-first charging strategies. A fleet depot with a 500 kW rooftop PV array can direct surplus midday generation into EV charging at close to zero marginal cost, reducing the grid charging requirement and improving the overall economics of the transition.
Modern CMS platforms communicate with chargers via the Open Charge Point Protocol (OCPP), which has become the de facto standard. Specifying OCPP-compliant chargers is a basic requirement for any installation—proprietary systems create vendor lock-in that limits future flexibility.
Implementation Roadmap
A structured approach to industrial e-mobility infrastructure typically follows five stages:
Stage 1 — Feasibility (1–2 months) Fleet electrification analysis, grid capacity check, NMD modelling, preliminary capital cost estimate. Output: go/no-go with cost envelope.
Stage 2 — Site Readiness (2–4 months) Detailed electrical audit, distribution upgrade design, protection coordination study, power quality assessment. Output: site upgrade specification and schedule.
Stage 3 — Infrastructure Procurement (2–3 months) Switchboard upgrades, new cable routes, earth systems, charger procurement. Engage Eskom or municipality for NMD variation if required—this process must begin early, as lead times are long.
Stage 4 — Installation and Commissioning (1–3 months) Electrical works, charger installation, CMS integration, protection testing, load management verification. Full functional test with the first pilot vehicles.
Stage 5 — Operation and Optimisation (Ongoing) CMS performance monitoring, tariff optimisation, integration with fleet management software, incremental capacity expansion as the fleet grows.
Total elapsed time from feasibility to first vehicles charging: typically 8–14 months for a medium-sized industrial fleet. Sites that begin the readiness assessment now will be in position to receive electric vehicles when South African supply improves over the next 24–36 months.
The South African Regulatory Context
Several regulatory developments are shaping the economics of industrial e-mobility in South Africa:
Vehicle import regulations: The Department of Trade, Industry and Competition (dtic) has signalled intent to require an increasing proportion of zero-emission vehicles in the government fleet, which will drive local market development and, over time, reduce vehicle acquisition costs for private operators.
Carbon tax: South Africa's carbon tax—currently R190 per tonne of CO₂-equivalent—applies to fuel combustion. As the tax escalates annually, the cost disadvantage of fossil-fuelled fleet operations increases relative to electrified alternatives.
NERSA embedded generation rules: The 100 MW self-generation threshold introduced in 2021 allows industrial sites to combine solar PV, BESS, and EV charging infrastructure into a single embedded generation system without a generation licence, simplifying the regulatory path considerably.
SANS 60364 and grid codes: Electrical installation requirements for EV charging are governed by SANS 60364 (equivalent to IEC 60364). The SANS 10142-1:2022 amendment includes specific provisions for EV charging circuits, including RCD requirements, protective conductor sizing, and isolation requirements.
What GNTech Brings to an E-Mobility Project
Gorlan specialises in the electrical infrastructure layer that sits between the grid and the charger—the part of an e-mobility project that is most often under-engineered and most often responsible for delays.
Our scope typically includes:
- LV and MV switchboard upgrades to carry the additional charging load.
- Submains and cable route design for charging court layouts.
- Protection coordination studies to ensure fault selectivity across the expanded system.
- Integration with Pronutec RMUs for MV-fed sites with large charging loads.
- Power quality analysis and harmonic filter specification where required.
- BESS and solar PV integration to maximise self-consumption and minimise demand charges.
We work alongside CMS providers and EV charger OEMs as the electrical engineering partner—the entity responsible for ensuring the infrastructure is safe, compliant, and capable of growing with the fleet.
Getting Started
The most important action for any industrial organisation considering fleet electrification is to commission a site readiness assessment now, before fleet orders are placed. The electrical infrastructure timeline is the longest lead item in an e-mobility programme. Organisations that discover their switchboard requires replacement after vehicles are already on order face costly delays.
GNTech's engineering team conducts site readiness assessments across the Gauteng, KwaZulu-Natal, and Western Cape regions. Contact us to begin the conversation—and ensure your site is ready for the electric fleet when it arrives.