Zappi EV charger Perth guide: charging your car from solar surplus

A myenergi Zappi is a solar-aware EV charger: it watches how much power your solar system is exporting and ramps your car's charging speed up or down to soak up that surplus, instead of sending it back to the grid for a couple of cents a kWh. Charging entirely from the grid instead of entirely from your own surplus is worth around $563 a year for a typical Perth driver, and the Zappi's job is to claw back as much of that gap as your roof allows. It is worth being clear up front that a plain charger on a timer captures a good deal of it too, on clear days with surplus to spare. The Zappi earns its premium in the hours when surplus runs below the charge rate. The full numbers, and the assumptions they rest on, are below.

It's a Type 2 AC charger, available as 7.4kW single-phase or 22kW three-phase, and reads your export level with a CT clamp fitted at your switchboard. No OCPP, no inverter integration, no app account required for basic ECO charging: it works purely from what it sees at the meter.

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Why does solar-responsive EV charging matter in Perth?

Perth's electricity pricing makes a strong case for using your own solar rather than exporting it:

The gap between what you save by not importing and what you'd have earned by exporting sits at about 23c to 31c/kWh, depending on when you'd otherwise have exported. Most solar EV charging happens in the 9am-3pm window, where that gap is at its widest: you're giving up a 2c/kWh export credit to avoid a 33.26c/kWh import charge. That's the economic case for a charger that follows your solar output rather than running on a fixed schedule.

If you want the fuller picture on setting up and timing solar EV charging in Perth, see charging your electric vehicle with solar in Perth.

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How much can a Zappi actually save you in Perth?

Here's a modelled example. Take a mid-size EV that uses 18kWh per 100km (about 5.6km per kWh, a working figure inside the 15-20kWh/100km range most mid-size EVs fall into), driven around 10,000km a year. That's about 1,800kWh of charging a year, or roughly 4.9kWh a day. Our other EV guides model 15,000km a year, so if you drive closer to that, scale the figures below up by half.

The full spread is wide. All 1,800kWh bought at the A1 rate costs about $599 a year. All 1,800kWh taken from solar surplus costs about $36 a year in forgone export credit. So the most any charging strategy can save you here, grid to solar, is around $563 a year.

The Zappi does not capture that whole spread, and this is where a lot of charger marketing overreaches. Most of that gap is won by when you plug in, not by which charger you own. A plain charger on a timer, set to run in the middle of the day on a system with surplus to spare, already draws largely from your own solar, because the house pulls from the panels before anything reaches the grid. Most EVs can schedule that from the car itself, no smart charger required.

What the Zappi adds is precision in the hours when surplus is smaller than the charge rate: cloudy stretches, shoulder seasons, early mornings and late afternoons, and any time the house is already using a chunk of what the roof is making. A plain charger drawing a flat 7.4kW through those hours tops up the shortfall from the grid at 33.26c/kWh. The Zappi throttles down to match what's actually spare and takes almost nothing.

So the honest way to size the benefit is this: it scales with how much of your charging lands in partial-surplus conditions. A household that charges only on clear summer middays, with a big system and a small daytime load, will see very little difference and shouldn't buy a Zappi for the savings. A household charging most days year-round, through Perth's winter and its cloudy weeks, on a system where the house is already eating much of the midday output, captures a real share of that $563 spread. Somewhere in between is where most people land, and it depends on your own roof, load and habits rather than on a number we can quote for you.

For the broader rundown of EV charging tariffs and costs across WA, see electric vehicle charging at home: WA tariffs, costs, and smart strategies.

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How do Zappi's ECO and ECO+ modes work?

The Zappi has three charging modes, and they trade off speed against how much solar you use:

1. Boost mode. Charges at full rated speed (7.4kW single-phase) straight from the grid, solar or no solar. This is what a standard EVSE does all the time.
2. ECO mode. The Zappi reads your home's net export via the CT clamp and blends solar with just enough grid power to hold a minimum charge rate (typically 1.4kW). If solar output drops, it tops up from the grid rather than stopping.
3. ECO+ mode. The Zappi waits until solar surplus alone can cover the full charge rate before it starts. No surplus, no charging. It gets you the most solar-charged kWh, but suits drivers who aren't in a hurry.

In Perth terms: ECO mode gets your car topped up as soon as the sun's up, blending in a little grid power along the way. ECO+ holds off until the surplus can carry the whole load, usually the middle of the day, then charges flat out on solar. How wide that window runs depends on the season and your household's daytime draw.

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What are the Zappi's specs?

For most Perth homes on single-phase supply, the Zappi 7.4kW single-phase is the fit. Three-phase supply unlocks the 22kW variant, which speeds up charging for vehicles that support high-rate AC charging. It doesn't change the cost per kWh either way.

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How much does a Zappi cost installed in Perth?

Approximate 2026 Perth installed pricing:

Confirm current pricing with an installer: these are broad ranges, not a quote. The same figures, alongside every other charger sold here, are in best home EV chargers for Perth in 2026.

The hardware gap is roughly $800-$1,250 over a basic non-solar unit. The install is not quite like-for-like either: a Zappi also needs the CT clamp fitted at the switchboard and a data path back to the charger, which is trivial if the two are close together and more work if the charger sits at the far end of the house. Budget a little more for the Zappi install, not the same.

What that premium buys is harder to pin down than most charger marketing admits, and it is worth being precise about why. In a partial-surplus hour, a plain charger does not import everything: it takes whatever solar is going and imports only the shortfall. A Zappi throttles down to the surplus and imports nothing, but it also delivers less charge in that hour. The energy it declined to import has not been saved, it has been deferred, and it still has to come from somewhere.

So the Zappi only genuinely saves you money when the car stays plugged in long enough for later surplus to cover what it deferred. Leave it on the charger all day and the Zappi can shape a full charge almost entirely out of solar while a plain charger would have front-loaded at full rate and imported the difference. Plug in for two hours after work and it saves you nothing at all, because there is no later surplus to wait for.

That makes the honest test a question about your habits rather than a formula: how many kWh a year would you actually import with a plain charger, that a Zappi would instead have met from surplus later in the same plugged-in stretch? Every one of those is worth about 31c. If that comes to a few hundred dollars a year, the premium pays back in a handful of years. If your car is only ever on the charger in the evening, or only on clear summer middays with headroom to spare, it does not, and a timer on a cheaper charger does the same job.

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Does a Zappi work with all solar inverters?

Yes. The Zappi reads solar export via a CT clamp at the switchboard, independent of the inverter brand. It doesn't need any integration with Sungrow, Fronius, Enphase, SolarEdge, or any specific monitoring platform. That's its main advantage over OCPP-based solar EV chargers, which typically need inverter integration or smart meter data to do the same job.

What a Zappi install needs:

1. A CT clamp at your switchboard, included with the Zappi.
2. A Type 2 charging socket or cable.
3. A power source nearby for the CT clamp data line, or a hardwired connection.

A licensed electrician confirms the specifics for your switchboard and circuit setup as part of the install.

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How does Zappi compare to other solar-aware EV chargers in Perth?

The Zappi and the Ohme both read export through a CT clamp, so neither needs inverter API access or smart meter integration to follow your solar. The Zappi leans hardest on that: solar routing is its default behaviour rather than one feature among several, and it needs no app configuration to enter ECO mode. If you're weighing it against the full field of Perth chargers rather than just these two, see best home EV chargers for Perth in 2026. And if you're sizing a new solar system with EV charging in mind from the start, how to size your solar system for an electric vehicle in Perth covers that groundwork.

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For Perth EV owners with solar, the gap between charging entirely from the grid and entirely from your own surplus is worth around $563 a year on a 10,000km-a-year car. A timer on any charger captures part of that on clear days; the Zappi's ECO mode is what captures the rest, in the hours when surplus runs below the charge rate. It works with any inverter and needs no integration beyond a switchboard CT clamp, which makes it one of the lowest-friction ways to charge an EV from Perth solar, but whether the premium pays back depends on how much of your charging falls in those partial-surplus hours.