If you have rooftop solar and an EV, the best EV charger for your home isn't necessarily the cheapest or the fastest — it's the one that intelligently matches charging to your solar export. With Australian feed-in tariffs falling below 5 c/kWh in most states and grid import prices above 35 c/kWh, the gap between "smart solar charging" and "dumb 7 kW charging" can be worth $600–$1,200 a year. Here's how solar-diverting EV chargers work, which models lead the Australian market, and how to pick the right one.
Why Solar Diversion Matters
Every kilowatt-hour you push to the grid earns a feed-in tariff of around 3–7 c/kWh in 2025. Every kilowatt-hour you import to charge the car later costs 30–55 c/kWh. That's a 25–50 c/kWh spread. Solar diversion (sometimes called solar-matching or eco-charging) keeps that energy on your side of the meter by ramping the EV charger up and down to match whatever surplus your inverter is producing.
A typical Australian household with an 8 kW solar system and a commuter EV that charges 10,000 km/year from rooftop surplus avoids importing around 2,500 kWh from the grid annually. At 40 c/kWh import vs 5 c/kWh feed-in, that's around $875 a year in avoided cost — often enough to pay for the solar-capable charger in two years.
myenergi Zappi v2.1 — The Benchmark
The Zappi is the solar-diversion charger everyone else gets compared to. Built by UK firm myenergi, it reads a CT clamp on your grid tie and modulates the charge rate from 1.4 kW up to 7.4 kW (single-phase) or 22 kW (three-phase) to follow your export in real time. The "Eco+" mode only draws from surplus solar; "Eco" tops up from the grid if solar dips below a threshold; "Fast" ignores solar altogether.
Expect $1,600–$1,900 for the unit and $2,800–$4,200 installed depending on cable run, phase, and switchboard work. Integration with myenergi's Eddi hot water diverter and Libbi battery is the main reason whole-of-home myenergi setups are popular with Australian installers.
Fronius Wattpilot — Natural Pairing for Fronius Solar
If your inverter is a Fronius Primo, Symo or GEN24, the Wattpilot is the path of least resistance. It uses the inverter's Smart Meter data directly — no extra CT clamp — and integrates with Fronius Solar.web for monitoring. Three modes mirror the Zappi: Eco, Next Trip (time-bounded charge to a target), and fast charge.
The Wattpilot comes in 11 kW (three-phase) and 22 kW variants. Pricing sits at $1,300–$1,700 for the unit and $2,400–$3,800 installed. The lower price relative to the Zappi makes it a strong pick for anyone already in the Fronius ecosystem.
Tesla Wall Connector Plus Charge HQ or Tessie
The Tesla Wall Connector has no native solar-diversion logic. Out of the box, it charges at whatever rate you set in the Tesla app. What transforms it into a solar-aware charger is a third-party cloud service:
- Charge HQ (Australian-built) reads your inverter feed and tells the car via the Tesla API to slow or speed up its charge to match solar export. Subscription is around $66/year.
- Tessie adds similar solar-matching plus fleet management. Around $70/year.
Installed Wall Connector runs $900–$1,400 plus $800–$1,500 in installation. Add the subscription and you have a capable solar-charging Tesla setup for under $2,500 all-in — cheaper than a Zappi, though you rely on cloud APIs instead of local control.
Catch Power Solar Relay — Pair With Any Charger
The Solar Relay is a uniquely Australian option. It's a standalone contactor/relay that monitors your export and switches any dumb EV charger on or off based on surplus. It won't give you smooth modulation — just on/off at a configurable threshold — but it's about $450 for the unit and works with a $900 generic EV charger, delivering basic solar-only charging for under $2,000 installed.
EO Mini Pro 3, Wallbox Pulsar Plus and OCPP Options
Beyond the big names, several mid-tier chargers offer genuine solar modulation:
- EO Mini Pro 3 — compact 7 kW unit with solar matching via the EO Hub and CT clamp. $1,300–$1,600 installed.
- Wallbox Pulsar Plus — popular 7 kW (single) and 22 kW (three-phase) with the myWallbox app and solar matching via the Power Boost meter. $1,800–$2,600 installed.
- Schneider EVlink, Ocular LTE, Delta AC Mini — OCPP 1.6J chargers that don't do solar matching on their own but, paired with Charge HQ or a building management system, become fully solar-aware.
An OCPP charger plus Charge HQ is a powerful combination if you want retailer-agnostic smart charging that can also follow wholesale prices on Amber, Engie or Localvolts.
Single-Phase vs Three-Phase
Three-phase is only useful if your switchboard is actually three-phase and your EV has a three-phase onboard charger. A Tesla Model Y, Polestar 2 or BYD Seal can draw 11 kW three-phase, dramatically reducing the time spent at low charge rates when solar output is modest. But a Model 3 RWD or a Nissan Leaf is single-phase on the AC side and will cap at around 7 kW no matter what charger you hang on the wall.
If you have three-phase service and a three-phase-capable car, pay the premium. Otherwise, a 7 kW single-phase charger is the correct pick.
| Charger | Solar Diversion | Phase Options | Installed Cost |
|---|---|---|---|
| myenergi Zappi v2.1 | Native, CT clamp | 1ph 7.4 kW / 3ph 22 kW | $2,800–$4,200 |
| Fronius Wattpilot | Native, Fronius meter | 3ph 11 kW / 22 kW | $2,400–$3,800 |
| Tesla Wall Connector + Charge HQ | Via cloud API | 1ph 7.4 kW / 3ph 11 kW | $1,700–$2,900 + sub |
| EO Mini Pro 3 | Native, EO Hub | 1ph 7.4 kW | $1,300–$1,600 |
| Wallbox Pulsar Plus | Native, Power Boost | 1ph 7.4 kW / 3ph 22 kW | $1,800–$2,600 |
| Catch Power Solar Relay + dumb charger | On/off only | 1ph or 3ph | $1,800–$2,400 |
| Schneider EVlink / Ocular LTE + Charge HQ | Via OCPP cloud | 1ph or 3ph | $2,200–$3,200 + sub |
Integration With Home Batteries
If you already have a home battery (Tesla Powerwall 3, Sungrow SBR, BYD HVM, AlphaESS) you need to decide whether the EV should compete with the battery for surplus solar. Most installers configure the battery to charge first, then the EV charger takes whatever solar is left. The Zappi and Wattpilot both have priority settings for this. Tesla Powerwall 3 + Tesla Wall Connector + Tesla Vehicle is a closed loop — the Tesla app handles this natively without any third-party software.
How to Decide
The decision tree most Australian households end up following:
- Already have a Fronius inverter? Wattpilot.
- Want the reference-grade solar-diversion experience regardless of brand? Zappi.
- Drive a Tesla and happy with a cloud subscription? Wall Connector + Charge HQ.
- On a tight budget and happy with on/off solar-only charging? Catch Power Solar Relay + dumb charger.
- Want retailer-agnostic wholesale-price charging on Amber? Any OCPP charger + Charge HQ.
Run the Numbers for Your Home
Charger price is only part of the equation — the real payoff is how many kilowatt-hours you shift from grid import to self-consumed solar each year. Use our Solar + EV Calculator to model your driving, solar size, tariff and feed-in rate, and see how much a solar-matching EV charger actually saves in your situation.