Home EV charging speeds and costs in WA
Charging time by charger type
Charging power by charger type
| Charger | Power | Adds 36 kWh (60 kWh battery, 20% to 80%) |
|---|---|---|
| Standard 10 A power point | Up to 2.4 kW | About 17 h 39 min with 15% losses |
| 15 A power point | Up to 3.6 kW | About 11 h 46 min with 15% losses |
| 7 kW single-phase wall charger | 7 kW | About 5 h 32 min with 7% losses |
| 11 kW three-phase wall charger | 11 kW, if the car accepts it | About 3 h 31 min with 7% losses |
| 22 kW three-phase wall charger | 22 kW, if the car accepts it | About 1 h 46 min with 7% losses |
Our arithmetic, at Western Power's 240 V standard supply for the power points and the chargers' rated power otherwise. A three-phase charger on a single-phase home charges at about 7 kW at most. Checked 5 October 2026.
Charging cost on Synergy's prices
Synergy rates for EV charging
| Plan and time | Cents per unit | 36 kWh into the battery (7 kW charger) |
|---|---|---|
| Synergy Home Plan (A1) | 33.2621 | $12.88 |
| Synergy EV Add On, overnight 11pm–6am | 19.9172 | $7.71 |
| Synergy Midday Saver or EV Add On, 9am–3pm | 8.852 | $3.43 |
| Your own solar | 2 | $0.77 |
Synergy's published prices from 1 July 2026, including GST. The 2c solar figure is the DEBS buy-back you give up by charging from your own panels outside 3pm–9pm; on REBS (older solar systems) Synergy pays 7.135c; enter that instead. Both buy-back rates are effective from 1 July 2025. The EV Add On is for customers with an electric vehicle registered to the home address, and needs an advanced (AMI) meter, so it's only offered where Western Power has them. Costs are our arithmetic with 7% losses. Checked 5 October 2026.
Before you install a wall charger
- Check your car's AC charging limit: a 22 kW charger won't charge a car limited to 11 kW any faster
- Western Power names a 7 kW single-phase charger as permitted on a standard connection
- For EV charging, Western Power requires the main switch to be a circuit breaker, which can mean switchboard work
- A licensed electrical contractor installs the charger on its own circuit and checks the home's maximum demand and supply before adding the load
Read more about EV charger installation in Busselton, including published installation prices, or see the battery rebate calculator if you're adding a home battery too.
Common questions
Does charging from a power point waste more electricity?
Yes. In tests published in August 2026, the German motoring club ADAC measured losses of 12.7% to 24.2% on a household socket and 5.1% to 7.0% on an 11 kW wallbox. The calculator starts at 15% for power points and 7% for wall chargers; you can change them.
Where these figures come from
The rates and charging figures on this page come from these published pages, checked on 5 October 2026.
- Western Power: installing electric vehicle charging stations · Western Power (network operator for Busselton), refers to the WA Service and Installation Requirements, April 2023
- ADAC: charging losses of electric cars (Ladeverluste beim Elektroauto) · ADAC, German motoring club (tests at German 230 V supply), 6 August 2026
- Synergy: changes to your electricity prices (from 1 July 2026) · Synergy (WA Government-owned retailer), prices effective 1 July 2026, GST included
- Synergy: Electric Vehicle Add On · Synergy, prices effective 1 July 2026, GST included
- Synergy: Distributed Energy Buyback Scheme (DEBS) · Synergy, effective as at 1 July 2025
- Green Vehicle Guide · Australian Government, live database
