Electric vehicle uptake in Australia is accelerating faster than grid infrastructure, which means the quality of your home or commercial charging installation matters more than ever. A correctly engineered EV charger circuit does not simply deliver power to a vehicle — it manages that power intelligently relative to your building's total demand, your solar generation curve, and your energy tariff structure. VOLTCITY SURGE are licensed electrical contractors with specific expertise in EV charging infrastructure, from residential single-phase installs to multi-bay commercial DC fast-charging stations.
Residential EV Charger Installation
The standard for home EV charging in Australia is a hardwired Mode 3 Type 2 EVSE (Electric Vehicle Supply Equipment) connected to a dedicated circuit. A 7.4kW single-phase charger typically adds 40-50 km of range per hour — practical overnight for most commuter use cases. Where three-phase supply is available, 11kW or 22kW chargers reduce full-charge time significantly. VOLTCITY SURGE assesses your existing switchboard capacity, main fuse rating, and cable sizing before specifying charger power levels. Where the existing switchboard is undersized or lacks spare circuit capacity, we coordinate any upgrade required as part of the project scope.
Smart Charging Features We Configure and Commission
- OCPP 1.6 and 2.0.1 compliant chargers enabling remote start/stop, session metering, and back-office management
- Solar excess charging — charger throttles up and down dynamically to consume surplus solar generation before it exports to the grid
- Time-of-use tariff scheduling — charge automatically during off-peak periods to minimise energy costs
- Load management — current limiting to prevent total site demand from exceeding main fuse rating during simultaneous vehicle and household loads
- App-based monitoring with real-time power draw, session history, and cost tracking
- Multi-charger load sharing for commercial sites with multiple bays sharing a single supply capacity
- Integration with home battery systems (Tesla Powerwall, Sungrow, Alpha-ESS) for overnight discharge sequencing
Commercial and Fleet EV Charging Infrastructure
Commercial EV charging introduces additional complexity: multiple simultaneous vehicles, billing and access control requirements, and the need to stay within site capacity limits without upgrading the main supply — which is often the most expensive part of a commercial EV project. We design charging infrastructure using dynamic load management systems that distribute available capacity across active charging sessions, ensuring every vehicle charges as fast as possible within the total site power budget. For retail, hospitality, and workplace sites, we specify OCPP-compliant chargers compatible with roaming networks and white-label payment platforms, enabling tenant billing, staff benefit charging, and public pay-per-use from the same hardware.
Solar-Linked and Battery-Integrated Charging
The most cost-effective EV charging for residential customers combines a smart charger with an existing or co-installed solar system. Our commissioning process configures the charger's solar-tracking mode using CT clamp readings of your inverter export — the charger dynamically adjusts its draw to match surplus generation, reducing grid imports to near zero during sunny days. For customers with home batteries, we programme charge sequencing so the battery fills to a set state-of-charge threshold before the EV charger activates, preserving backup capacity for evening demand. These configurations are validated during commissioning with test sessions under real solar generation conditions.
DC Fast Charging for High-Throughput Sites
Where rapid vehicle turnaround is required — taxi depots, logistics hubs, service stations — DC fast charging delivering 50kW to 150kW per bay is the right infrastructure. DC chargers bypass the vehicle's on-board AC charger and inject current directly into the battery pack, delivering 200-400 km of range in 30-60 minutes. VOLTCITY SURGE manages the complete civil, electrical, and commissioning scope for DC fast-charger installations, from trenched high-voltage supply cables and protection relays to charger network configuration and DNSP connection approvals.
Frequently Asked
Can my existing switchboard handle an EV charger?
It depends on your current load and main fuse rating. A 7.4kW single-phase EV charger draws approximately 32 amps — significant additional demand on a typical residential supply. We conduct a load assessment as part of every installation to confirm headroom. Where the switchboard is at or near capacity, we discuss options including a load management relay, a switchboard upgrade, or a charger model with configurable current limits.
What is the benefit of an OCPP-compliant charger over a basic plug-in unit?
OCPP (Open Charge Point Protocol) enables two-way communication between the charger and a back-end management system. This unlocks solar excess charging, time-of-use scheduling, remote diagnostics, firmware updates, and billing functionality. It also future-proofs your installation — as the energy market evolves toward vehicle-to-grid (V2G) capabilities, OCPP-compatible hardware is the foundation those services will build on.
Do you handle the network operator approval process for commercial DC chargers?
Yes. DC fast-charger installations typically require a formal connection application to your Distribution Network Service Provider (DNSP) — in some states, this involves protection relay settings, metering upgrades, and engineering sign-off. VOLTCITY SURGE manages the full DNSP application process, liaises with the network operator's technical teams, and ensures the installation meets AS 61851 and any specific network requirements before energisation.