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EV Charging Calculator (Australia)

Free EV charging calculator for Australian drivers. Estimate kWh drawn, charge time on a 7.4 kW single-phase wallbox, electricity cost at 2026 retailer rates, and savings from charging via rooftop solar.

EV Charging Calculator

Energy drawn from the source
50 kWh
Time to reach target
6 h 45 min
Cost on grid only
$16
Cost after solar offset
$6
Saving from solar: $10
Single-phase 10 A trickle (2.3 kW): overnight only.
Single-phase 32 A wallbox (7.4 kW): full charge in 9-11 h.
DC fast (50-350 kW): typical highway charge 25-40 min.

How to use this calculator

Enter six values and the calculator returns charge time, kWh drawn, and the dollar cost both with and without rooftop solar offset:

  1. Battery capacity (kWh) — your EV’s usable battery. 2026 Australian volume sellers: Tesla Model Y RWD 60 kWh, Tesla Model Y LR 75, BYD Sealion 7 82, Kia EV6 GT-Line 77, Hyundai Ioniq 5 84, Polestar 2 LR 82, BYD Atto 3 60.
  2. Charger power (kW) — most Australian home wallboxes are 7.4 kW single-phase. Tethered units typically fall in this band: Tesla Wall Connector, Wallbox Pulsar Plus 7.4, Evnex E2, JET Charge Universal, Schneider EVlink Home, ABB Terra AC.
  3. Starting and target state of charge (%) — daily 20→80% protects battery longevity. Manufacturer guidance (Tesla, Kia, Hyundai, BYD) all align on 80% as the daily ceiling.
  4. Electricity tariff per kWh — your retail rate in $/kWh. 2026 AER market avg flat rate: 32¢. AGL EV Plan off-peak (NSW): 8¢. Origin EV Power Up off-peak: 12¢. Energy Australia EV Saver off-peak: 11¢. Powershop Power Drive off-peak: 10¢.
  5. Share covered by solar PV (%) — fraction of charging energy from your panels. 60-80% is realistic with daytime weekend charging in Australian conditions, especially with a 5-13 kWh battery (Tesla Powerwall 3, Sungrow SBH, BYD Battery-Box).
  6. Charging efficiency (%) — wall-to-battery. 90% AC default. JET Charge field data shows 88-92% across Australian climates.

How the math works

The calculator runs an energy balance:

energy_to_battery (kWh) = battery_kwh × (target% - start%) / 100
energy_drawn (kWh)      = energy_to_battery / efficiency
charge_time (hours)     = energy_drawn / charger_kw
grid_cost ($)           = energy_drawn × tariff
solar_savings ($)       = grid_cost × (solar_pct / 100)
final_cost ($)          = grid_cost - solar_savings

Worked example for the en-au defaults (75 kWh, 20→80%, 7.4 kW, 32¢/kWh, 60% solar, 90% efficiency):

  • Energy to battery = 75 × 0.6 = 45 kWh
  • Energy drawn = 45 / 0.90 = 50 kWh
  • Charge time = 50 / 7.4 = 6.76 h ≈ 6 h 45 min
  • Grid cost = 50 × $0.32 = $16.00
  • Solar saving = $16.00 × 0.60 = $9.60
  • Final cost = $6.40 per session

A typical Australian driver doing 12,000 km/year on a 4 km/kWh EV draws 3,000 kWh of charging annually. At flat 32¢ that’s $960/yr; with 60% solar offset $384/yr; on EV-tariff off-peak only $300/yr. Versus a 7L/100km petrol car at $2.05/litre ($1,720/yr), home solar+EV saves $1,300-1,400/yr.

Australian charger types — single-phase, three-phase, and DC fast

Granny lead / portable EVSE (2.3 kW, 10 A 3-pin GPO): Manufacturer cable for emergencies. Continuous 10 A draw on a standard Australian socket is borderline — never use a power-board or extension lead. Adds ~10 km/hour.

Single-phase wallbox (7.4 kW, 32 A): The Australian default. Dedicated radial circuit on a 32 A breaker, Type B RCD (or Type A + DC monitoring per AS/NZS 61851.1). Wallbox brands and 2026 hardware-only retail: Tesla Wall Connector $850, JET Charge Universal $1,295, Evnex E2 $1,499, Wallbox Pulsar Plus $1,295, Schneider EVlink $1,650.

Three-phase wallbox (22 kW, 32 A × 3): Same external footprint as single-phase but requires three-phase service. Common in newer estates and rural builds. Cuts charge time to ~2 h for a 75 kWh battery 20→80%.

Public DC fast (50-350 kW): Chargefox, Evie, Tesla Supercharger, NRMA, BP Pulse, Ampol AmpCharge. 2026 typical rate: 60-79¢/kWh. A 20→80% charge on 75 kWh costs $30-40 versus $5-8 at home on EV-tariff off-peak.

Pairing rooftop solar with EV charging in Australia

Australia leads the world in residential solar self-consumption optimisation. With FiT collapsing (5-7¢ in 2026 across most states, some retailers paying zero or charging for export), every diverted kWh is a 25¢/kWh saving versus exporting it.

Smart wallboxes with solar diversion (Catch Power Relay, Fronius Wattpilot, Charge HQ, MyEnergi Zappi, Evnex E2 with surplus mode) ramp the charge rate up and down to match real-time PV export. Combined with a 5-13 kWh battery, well-designed Australian homes hit 90%+ solar self-consumption even with EV charging.

The solar panel output calculator gives state-by-state generation; the savings calculator translates that into bill offset using current retail and feed-in tariffs.

What changes the math

Lowers the cost (good)

  • EV tariff plans (AGL, Origin, Energy Australia, Powershop) — off-peak as low as 8-12¢/kWh
  • Solar diversion smart wallbox to capture surplus that would otherwise export at 5¢
  • Home battery (Powerwall 3, Sungrow SBH, BYD Battery-Box) to time-shift midday solar to evening EV charging
  • Federal Small-scale Technology Certificates (STCs) still discount rooftop PV up to ~$2,000-3,500 for a typical 6.6 kW system
  • Controlled-load tariff (T31/T33) for off-peak EV charging on dedicated meter (where available)

Raises the cost (bad)

  • Flat-rate single-tariff plans without time-of-use — pays peak rates 24/7
  • Public DC fast as daily habit — 60-79¢/kWh
  • Three-phase upgrade if not already serviced — DNSP connection costs typically $3,500-8,000

Pair this with the output calculator, savings calculator, and cost calculator

Output gives Australian per-state PV generation, savings translates into bill offset, cost shows the installed price for a typical 6.6-13 kW Australian system.

Sources

Frequently asked questions

How long does a 7 kW wallbox take to charge an EV in Australia?
On a single-phase 7.4 kW (32 A) wallbox — the most common Australian residential charger — going from 20% to 80% on a 75 kWh battery (Tesla Model Y, BYD Sealion 7, Kia EV6, Hyundai Ioniq 5) takes roughly 6 hours 45 minutes accounting for ~10% AC charging losses. A three-phase 22 kW unit cuts that to 2 hours 15 minutes, but most Australian homes are single-phase — three-phase is typical only in newer builds and rural properties with farm load. Major retailers: Wallbox Pulsar Plus, Tesla Wall Connector, Schneider EVlink, Evnex E2, JET Charge.
How much does it cost to charge an EV at home in Australia?
At the 2026 AER residential market average of around 32¢/kWh, a 20-80% charge on a 75 kWh battery costs about $16 of grid electricity. Switching to an EV-specific tariff (AGL EV Plan, Energy Australia EV Saver, Origin EV Power Up) drops the off-peak rate to 8-15¢/kWh, taking the same charge to $4-7. Combined with rooftop solar — and Australia has the world's highest residential PV penetration — daytime charging from a 6.6 kW system effectively reduces marginal cost to zero on sunny days.
Are home solar panels worth it for charging an EV in Australia?
Australia is arguably the best country in the world for the solar+EV combination. A typical 6.6 kW Australian rooftop array generates ~9,500-10,500 kWh annually (CEC SunSpot, Sydney/Melbourne), more than enough to cover 30,000+ EV km a year on a 4 mi/kWh car. Feed-in tariffs have collapsed (5-7¢/kWh in 2026 across most states) so self-consumption is the lever — pairing solar with daytime EV charging or a battery turns 30¢/kWh import value into 5¢/kWh export value, a 25¢/kWh delta on every diverted kWh.
Do I need a single-phase or three-phase EV charger in Australia?
Single-phase 7.4 kW (32 A) is enough for 95% of Australian homes — it fully charges any current EV overnight (8-11 hours from empty). Three-phase 22 kW chargers (e.g. Schneider EVlink Wallbox 22, Wallbox Pulsar Plus 22 kW) only deliver three-phase speeds if your home has three-phase service from the street; otherwise the unit auto-derates to 7.4 kW single-phase. New estate builds in Victoria, NSW, and Queensland are increasingly three-phase by default — check the Network Service and Installation Manual (NSIM) of your DNSP for confirmation.
What standards apply to home EV charger installation in Australia?
The installation must comply with AS/NZS 3000:2018 (Wiring Rules) and AS/NZS 61851 (Electric vehicle conductive charging system). All work must be carried out by a licensed electrician and notified via an Electrical Safety Certificate of Compliance (ESCOC) — terminology varies by state: CES in Victoria, CCEW in NSW, EWR in Queensland. The charger needs a Type B RCD (or Type A + DC residual current detection) per AS/NZS 61851.1 Annex A. State-based rebates (Victorian Solar Homes, NSW EV Rebate, ACT Sustainable Household Scheme) periodically subsidise both the charger and installation.

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