Charge Your EV Free — Solar & Battery Done Right
Feeding grid power into your EV defeats the point of going electric. Voltie integrates your charger directly with your solar and battery system so you drive on sunshine, not expensive peak-rate electricity.
- Solar-aware EV charging that prioritises your own generation
- Compatible with leading inverters and battery systems
- Proper load management — no tripped breakers, no blown fuses
- Serving Cronulla, Sutherland, Menai, Miranda and across the Shire
Why a Basic EV Charger Misses the Mark When You Have Solar
Most standard EV chargers are dumb devices — they draw a fixed load the moment you plug in, regardless of what your solar panels are producing or what your battery holds. In Sydney's Sutherland Shire, where a typical afternoon sees strong rooftop generation through summer, that wasted opportunity is real money. A 7 kW charger running off the grid at peak tariff can cost two to three times more per kilometre than one drawing from your own panels.
The fix isn't just wiring the charger near the inverter. True solar integration requires a charger with dynamic power control — protocols like OCPP, Modbus or proprietary APIs that let the charger read your inverter's excess-export signal in real time and throttle its draw accordingly. Without that handshake, your battery drains to charge the car at 11 pm instead of soaking up the 2 pm solar surplus.
Older switchboards common in Shire homes — particularly the 60–100 A single-phase boards found in 1980s brick veneer houses in Engadine, Gymea and Jannali — often can't handle a simultaneous EV charge, air-conditioning load and battery inverter without careful load management or a switchboard upgrade. Voltie assesses that before a single cable is run.
Battery chemistry also matters. LFP (lithium iron phosphate) batteries like the Tesla Powerwall 3 and Sungrow SBR series tolerate deep daily cycling for EV top-ups far better than older NMC chemistries. If your battery is more than five years old, we'll discuss whether the charge cycle budget supports daily EV use or whether a schedule-based approach makes more sense.
It's a System, Not Just a Charger on the Wall
Integrating an EV charger with solar and battery involves three layers: hardware selection, electrical installation, and system configuration. Getting all three right is what separates a charger that reliably runs on solar from one that quietly pulls grid power every night.
- Charger selection: we specify models with genuine solar-export sensing — including Zappi, Wallbox Quasar and compatible
- CT clamp or direct inverter comms: a current transformer on your main incomer lets the charger track net import/export w
- Switchboard assessment: we check your main switch rating, neutral integrity, and available circuit slots before specifyi
- Load management relay: where total demand risks exceeding your main fuse, a contactor-based load shed protects the switc
- Commissioning and schedule tuning: we configure off-peak top-up windows as a backup to solar so the car is always ready,
Signs Your Current Setup Isn't Working Properly
Why Shire Homeowners Choose Voltie for Solar EV Integration
Licensed Electrical Work
All wiring, switchboard modifications and charger installation is performed by a NSW licenced electrician — required by law and non-negotiable for insurance validity.
Inverter-Agnostic Expertise
We work across Fronius, SolarEdge, Sungrow, Enphase and Tesla inverter platforms, selecting chargers and integration methods that suit your specific system.
AS/NZS 3000 Compliant Installation
Every installation meets the Australian Wiring Rules — cable sizing, circuit protection, earthing and labelling — so your insurer and future buyers have no grounds for concern.
What Shire Homeowners Say About Voltie
Real feedback from EV and solar customers across Cronulla, Menai, Sutherland and surrounds.
Solar EV Charger Integration — Common Questions
Stop Paying the Grid to Charge Your EV
A properly integrated solar EV charger can cut your charging cost to near zero on sunny days. Book a site assessment and we'll map exactly how your inverter, battery and new charger can work together.
Get a Fixed-Price Quote for Solar EV Integration
Tell us your inverter brand, battery model (if any), and where the car parks — we'll come out, assess the switchboard, and give you a written quote with no surprises.