This New Zealand calculator shows when a home EV charger pays for itself by saving on charging costs, mainly by letting you use cheap off-peak power instead of public fast chargers. You enter the install cost, your yearly distance, your car's energy use and the charging cost with and without the charger, and the tool shows the yearly saving and the payback period.
The "saving per kWh" is the gap between your charging cost without the charger (often public fast charging or peak home rates) and with it (off-peak home charging). Faster, more convenient charging is a benefit beyond the dollars. Estimate only.
The calculator works out the energy you charge each year from your distance and your car's consumption, multiplies it by the saving per kWh the home charger gives you, and divides the install cost by that yearly saving to get the payback period. Heavy drivers and a big off-peak saving pay the charger off fastest; light drivers may find the standard plug is fine.
Driving 14,000 km a year at 17 kWh per 100km is about 2,380 kWh. Saving 30 cents a kWh with the charger is about $714 a year, so an $1,800 charger pays back in roughly 2.5 years, then saves you money after that.
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