German test finds home EV charging can waste up to 24 per cent of power without wall box
By Eve
Testing by Germany's ADAC motoring club on five EV models (Tesla Model Y, Mercedes CLA 350 EQ, Volkswagen ID.7, Renault R5 E-Tech and Volvo EX30) found that charging from a standard 2.3kW home power point wasted between 12.7 per cent and 24.2 per cent of electricity, with the Mercedes recording the highest loss. Installing an 11kW wall box cut wastage to between 5.1 per cent and 7.0 per cent across all models. The results are relevant to Australian drivers because residential electricity supply matches Germany's at 230 volts single phase and 400 volts three phase.
Why it matters
The findings highlight a significant efficiency gap in domestic charging infrastructure that could inform procurement specifications for residential charge point installations. CPOs and installers can use the data to demonstrate the cost savings and energy efficiency benefits of wall box installations over standard power points, particularly when advising fleet operators or residential developments.
Source
- Original title
- “Test shows home EV charging can waste 24 per cent of power”
- Published
- 13 August 2026
- Updated
- 14 August 2026
In this story
- Topic
- EV Charging
- Place
- Australia
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