Smart EV Charging Explained: Load Balancing, Scheduling and OCPP for Manchester Businesses
Every EV charger sold in the UK since June 2022 must be a smart charger by law. But what does smart actually mean in practice, and how can Manchester businesses use smart charging features to cut electricity costs, install more chargers without expensive supply upgrades and manage their charging infrastructure effectively?
This guide explains the three most important smart charging capabilities — dynamic load balancing, scheduled charging and OCPP (Open Charge Point Protocol) — in plain terms. No jargon, no marketing fluff, just practical information for business owners, property managers and facility managers who need to make smart charging work for their operation.
What Makes a Charger Smart?
The Electric Vehicles (Smart Charge Points) Regulations 2021 define the minimum requirements. A smart charge point must be able to:
- Send and receive information — The charger must have a data connection (Wi-Fi, Ethernet or 4G) and be able to communicate with a back-end server
- Respond to signals — The charger must be capable of adjusting its output in response to external signals, such as grid demand signals or site management commands
- Support scheduled charging — Users or operators must be able to set charging schedules, including delayed start times
- Randomise start times — When no schedule is set, the charger must apply a random delay of up to 10 minutes to prevent thousands of chargers starting simultaneously when drivers plug in after work, which would cause grid spikes
- Not charge during peak hours by default — Smart chargers must default to off-peak charging unless the user overrides this setting
Dynamic Load Balancing
Dynamic load balancing is the single most valuable smart charging feature for any business installing more than two chargers. It is the difference between needing an expensive electrical supply upgrade and making your existing supply work.
How It Works
A current transformer (CT clamp) is installed on your building's incoming electrical supply. This device continuously measures the total power your building is consuming in real time. The load balancing controller — either built into the charger or provided as a separate unit — receives this data and calculates how much spare capacity is available for EV charging at any given moment.
When spare capacity is high (evenings, weekends, or when building equipment is idle), the chargers operate at full power. When spare capacity drops (morning start-up, air conditioning peak, kitchen equipment running), the controller automatically reduces charging power across all connected chargers to keep total building demand below the supply limit.
This happens in real time, typically adjusting every few seconds. Drivers do not notice the adjustments — their car simply charges slightly slower during peak building demand periods and speeds up when demand drops.
The Financial Impact
Without load balancing, a business with a 100-amp three-phase supply (69 kW total capacity) and 45 kW of existing building demand has 24 kW of headroom. That supports approximately three 7 kW chargers running simultaneously.
With load balancing, the same business can install six, eight or even ten chargers. The system ensures total demand never exceeds the supply capacity by throttling charging during peaks. During off-peak periods (which is most of the day for many offices), all chargers run at or near full power.
The cost of a CT clamp and load balancing controller is typically 200 to 500 pounds. The cost of a supply upgrade to support the same number of chargers without load balancing would be 3,000 to 15,000 pounds or more. The financial case is overwhelming.
Static vs Dynamic Load Balancing
Some charger installations use static load balancing, which simply divides the available power equally among all chargers at all times, regardless of building demand. If you allocate 21 kW to six chargers, each gets a fixed 3.5 kW. This is simpler and cheaper but wastes capacity — during off-peak hours when the building is using far less power, the chargers are still limited to 3.5 kW each even though much more is available.
Dynamic load balancing uses the real-time CT clamp data to maximise charging power whenever possible. It is worth the small additional cost for any installation with three or more chargers.
Scheduled Charging
Scheduled charging allows you to control when chargers are active and at what power level. This is a cost-reduction tool, a demand management tool and a fairness tool.
Off-Peak Tariff Optimisation
If your business is on a time-of-use electricity tariff (and most commercial properties should be), electricity costs vary by time of day. Peak rates are typically 30 to 50 per cent higher than off-peak rates. By scheduling EV charging to start at the off-peak threshold (usually 22:00 or 23:00), you can cut charging electricity costs significantly.
For an office with ten chargers each consuming 7 kWh per session, shifting charging from peak to off-peak could save approximately 3 to 5 pounds per day — over 1,000 pounds per year. The schedule is set once in the charger management software and applies automatically.
Demand Charge Management
Many commercial electricity tariffs include demand charges — a fee based on your peak power consumption during a billing period, measured in kVA. Adding EV charging during peak building hours pushes up your demand charge. Scheduling charging to start after building systems power down eliminates this additional cost.
Session Time Limits and Rotation
In car parks where more employees have EVs than there are chargers, scheduling features can enforce session time limits. For example, you can set chargers to end sessions after four hours and send a notification to the driver, prompting them to move their vehicle and let a colleague charge. Some systems support automated waitlisting where the next driver in the queue receives an alert when a charger becomes available.
Weekend and Holiday Schedules
Chargers at office locations that are empty on weekends can be scheduled to full-power, unrestricted mode — taking advantage of zero building demand to deliver the fastest possible charging for anyone who needs it. Separate schedules can be configured for bank holidays and shutdown periods.
OCPP: Why It Matters
OCPP stands for Open Charge Point Protocol. It is the open communication standard that allows EV chargers from any manufacturer to connect to management software from any provider. Think of it as the equivalent of USB for charger-to-software connectivity — a universal standard that prevents vendor lock-in.
The Vendor Lock-In Problem
Without OCPP, you are tied to the charger manufacturer's own software platform. If their platform increases fees, removes features, degrades in quality or the company goes out of business, you are stuck. Your chargers become unmanageable — you lose access to usage data, load balancing control, payment processing and remote diagnostics.
This is not hypothetical. Several EV charger manufacturers have exited the UK market or shut down their software platforms in recent years, leaving customers with hardware that functions as a basic charger but loses all smart features.
How OCPP Protects You
An OCPP-compliant charger can connect to any OCPP-compatible management platform. If you are unhappy with your current platform provider, you can switch — typically by changing a URL in the charger's configuration. Your hardware stays the same; only the software back-end changes.
The current standard is OCPP 1.6J, which is widely supported by virtually all commercial chargers sold in the UK. The newer OCPP 2.0.1 standard adds enhanced security, better support for smart charging and improved diagnostics, but adoption is still growing. For most installations in 2026, OCPP 1.6J is sufficient.
What to Look For
When purchasing chargers, verify the following:
- The charger explicitly supports OCPP 1.6J or 2.0.1 — not a proprietary protocol described as "compatible" or "similar"
- OCPP support is included at no extra cost — some manufacturers charge a premium for OCPP connectivity, which defeats the purpose
- The charger has been tested with multiple OCPP platforms — ask the installer which platforms they have successfully connected the charger to
- Remote configuration is possible via OCPP — you should be able to change settings, update firmware and run diagnostics through the management platform without a site visit
Choosing a Management Platform
If your chargers support OCPP, you have a wide choice of management platforms. The right platform depends on your needs.
Basic Monitoring and Control
If you only need to see how much energy each charger is consuming, set schedules and configure load balancing, most charger manufacturers' own platforms do this well and are often included free of charge. Easee, Alfen, Wallbox and others all offer competent basic platforms.
Payment and Revenue Management
If you charge users for electricity (guests, tenants, the public), you need a platform that handles payment processing, tariff setting and revenue reporting. Platforms like Monta, Fuuse, EVBox and Hubject specialise in this. They typically charge a monthly fee per charger (5 to 15 pounds) plus a transaction fee (usually 5 to 10 per cent of revenue).
Multi-Site and Fleet Management
For businesses managing chargers across multiple locations — property management companies, retail chains, fleet operators — enterprise platforms like ChargePoint, EVBox and Shell Recharge Solutions offer centralised management, role-based access, cross-site reporting and integration with energy management systems.
Integration With Building Management Systems
For larger buildings with existing BMS (Building Management Systems), some OCPP platforms can integrate EV charging data into the broader energy management picture. This is particularly valuable for buildings pursuing BREEAM or NABERS energy ratings.
Practical Implementation for Manchester Businesses
Small Office (5-20 Employees)
Start with two to four 7 kW chargers with dynamic load balancing. Use the manufacturer's own management platform for basic monitoring and scheduling. Total investment: 4,000 to 10,000 pounds installed. Set charging schedules to off-peak hours. No supply upgrade likely needed.
Medium Business (20-100 Employees)
Install six to twelve 7 kW chargers with dynamic load balancing and OCPP connectivity. Choose a third-party management platform if you plan to charge employees for electricity or need detailed reporting. Consider a supply assessment to confirm headroom. Total investment: 10,000 to 30,000 pounds installed, potentially including a supply upgrade.
Large Commercial Property or Multi-Tenant Building
Install fifteen or more chargers in phases, starting with the highest-demand areas. Use OCPP-compatible chargers connected to a multi-tenant management platform that supports per-tenant billing. Implement full dynamic load balancing with building-level CT monitoring. Engage with Electricity North West early to plan supply capacity for future phases. Total investment: 30,000 to 100,000 pounds over multiple phases.
Hospitality and Public-Facing
Install chargers with integrated contactless payment (required by law for public chargers rated 8 kW and above). Use a platform that handles public payment processing and ad-hoc user access. OCPP connectivity ensures you can switch platforms if pricing or service quality changes. Consider a mix of 7 kW and 22 kW chargers depending on typical dwell time.
The Regulations in Summary
Smart charging is not optional. The Electric Vehicles (Smart Charge Points) Regulations 2021, the Public Charge Point Regulations 2023 and the broader net zero strategy all require chargers to be intelligent, connected and capable of responding to grid signals. As the UK grid accommodates more renewable energy and more EVs, smart charging will become increasingly important for balancing supply and demand.
For Manchester businesses, this means every new charger you install should be genuinely smart — with dynamic load balancing, scheduling capability and OCPP support as standard. The upfront cost difference between a basic smart charger and a fully featured one is small. The long-term cost savings from load management and off-peak scheduling are significant.
Next Steps
Manchester Compliance designs, installs and maintains smart EV charging systems for businesses across Greater Manchester. We specify OCPP-compatible chargers with dynamic load balancing as standard and configure the management platform to suit your operation.
Get a free smart charging consultation. Call 0161 706 1360 or email Info@manchestercompliance.co.uk. We will assess your site, recommend the right configuration and provide a fixed-price quote.
View our EV charger installation services | Three-phase power upgrades for EV charging | EV charger buying guide