Already running solar panels on your Christchurch home — or planning to add them? A solar-integrated EV charger is the single upgrade that delivers the strongest return on that investment. Rather than selling surplus generation back to the grid at a meagre feed-in rate (typically 8–12c/kWh in NZ), a smart solar EV charger captures that energy and puts it straight into your car battery at no cost.
Christchurch's abundant sunshine makes the numbers work especially well here. A typical local home with a 6.6kW solar system produces 2–5 hours of excess electricity on a fine summer day — sufficient to deliver 14–35km of additional EV range without drawing a single unit from the grid.
A well-positioned Christchurch solar setup can supply meaningful free EV range each day
The exact mechanics vary slightly between charger models, but the underlying principle remains consistent across every solar-capable EV charger we install.
Your panels transform sunlight into electrical current and deliver it to your home via the inverter. Household loads draw on this solar output first. Any generation that exceeds what your home is consuming at that moment would ordinarily flow out to the grid.
Your solar-capable EV charger (Zappi, Evnex E2 Plus, or Smart EV Charger with ECO mode) continuously watches energy flow at your switchboard through a CT clamp sensor. The moment it identifies solar power heading toward the grid, it captures that energy and routes it to your EV battery instead — automatically and in real time.
Your car's battery gains charge using solar energy that would otherwise have been sold to the grid at well below retail value. When solar generation falls — through cloud or as daylight fades — the charger either holds off (Eco+ mode) or blends in a minimum amount of grid power (Eco mode). You choose which behaviour fits your routine.
When your EV requires more energy than the day's solar has delivered, the smart charger draws the shortfall from the grid — scheduling this during an overnight off-peak tariff window wherever possible. Minimum and maximum target charge levels are configurable from the app.
The charger's companion app displays precisely how much solar versus grid energy each session consumed — giving you a running view of your cost savings. Across a Christchurch summer, households with solar EV integration routinely source 60–80% of all EV charging directly from their own rooftop panels.
Every solar-integrated charger we fit is also load management-capable. When you eventually add battery storage or expand your solar array, your charger adapts without needing replacement. One installation covers the full lifespan of your current EV and whichever model comes next.
Solar integration is not a feature found on every EV charger. What you need is a smart charger with CT monitoring capability — one that reads the net export at your switchboard and automatically adjusts its charge rate to match available solar surplus. The models we install with solar integration are:
Will it work with my solar brand? In most cases, yes. The CT clamp method used by Zappi and Evnex E2 Plus is inverter-agnostic — it reads grid current directly and operates regardless of whether you have Fronius, SolarEdge, Enphase, SMA, Goodwe, or any other inverter brand. We confirm compatibility as part of your free quote.
Yes — and the numbers are genuinely compelling. Below is a straightforward comparison for a typical Christchurch home running a 6.6kW solar system alongside a 60kWh EV:
Without solar EV integration: Daytime solar surplus exported at ~10c/kWh. EV charging drawn from the grid costs ~28–32c/kWh. Topping up a 60kWh battery each week runs approximately $18–19.
With solar EV integration (Zappi Eco+ mode): Surplus solar is diverted into the EV at ~0c per kWh — you produced it. The same 60kWh weekly charge sourced from your panels costs approximately $0–$5 depending on conditions.
Across a full Christchurch year, a home with strong solar generation can cover 50–70% of total EV electricity costs through its own panels — translating to annual savings of $600–$1,200. On that basis alone, the Zappi typically recovers its cost within 2–3 years.
Talk to Us About Solar EV IntegrationEstimated annual reduction in EV electricity costs for a Christchurch household with 6kW+ solar generation.
On clear Christchurch days your vehicle draws power entirely from your own roof — no grid cost, no emissions.
Solar self-consumption at 28c/kWh effective value is 2–3× more profitable than exporting at the 8–12c/kWh feed-in rate.
Solar-plus-EV-ready homes command growing interest from Christchurch buyers — a tangible advantage at resale time.
The Robertsons had a 10kW Fronius solar system fitted in 2021 on their north-facing Cashmere hillside roof — one of the more productive solar sites anywhere in Christchurch. Their system was consistently producing more electricity than the household consumed during the day, pushing the excess to the grid at a feed-in rate of just 9c/kWh. When their Tesla Model 3 Long Range arrived, they started charging it overnight from the grid at their standard tariff of 30c/kWh — purchasing costly grid electricity for the car while simultaneously offloading daytime solar surplus at less than a third of that rate. The inefficiency was obvious and irritating from the start. They had read about solar-integrated EV chargers but had no clear picture of what was actually available in NZ or how the technology operated day-to-day. Their solar installer pointed them our way.
We mounted a myenergi Zappi 7.4kW charger on a dedicated 32A circuit and installed a CT clamp on the mains at the switchboard, giving the Zappi continuous real-time data on the household's net import and export position. The Zappi reads that CT feed constantly and trims the Tesla's charge rate every few seconds to match available solar surplus. On clear days, the Robertsons run Eco+ mode — the charger holds off until solar generation exceeds household demand, then pulls only the excess. On overcast days, Eco mode blends solar and a minimum grid draw to maintain at least some charging rate throughout the day. We also set up a scheduled grid-top-up window from 11pm to 1am so the Tesla always departs with a baseline charge level regardless of solar conditions. Compatibility with the Fronius Primo inverter required no software pairing — the Zappi reads grid current at the CT clamp independently of the inverter.
Through the first complete year of operation, 68% of all energy reaching the Tesla battery came directly from the Robertsons' solar panels — generation that would otherwise have left the property at 9c/kWh. Based on their typical monthly usage, swapping overnight grid charging at 30c/kWh for daytime solar surplus delivers a saving of roughly $1,100 annually. On a fine Christchurch summer day, the Zappi generally kicks into gear around 10am as surplus builds, then runs uninterrupted through mid-afternoon — putting 25–30kWh of effectively free power into the Tesla in one session. Andrew monitors each session's solar-versus-grid split, lifetime CO₂ avoided, and cost-per-charge through the Zappi app. Grid export has fallen substantially, their power bill is meaningfully lower, and the Tesla consistently leaves the garage with a full or near-full battery — without Andrew touching a schedule.
"Watching the Zappi run the Tesla from 10am through to 3pm on a bright day — at essentially no cost — never stops being satisfying. Our power bill is well below what our neighbours pay with the same solar system, simply because we're consuming our own generation rather than giving it away at a low rate." — Andrew Robertson, Cashmere, Christchurch



We carry out home EV charger installations throughout Christchurch, Banks Peninsula, and North Canterbury. Choose a letter to locate your suburb.