Home Charging vs Public Charging Cost

Measure the same thing at both locations

The energy stored in a battery can be lower than the energy drawn from the supply. For a 60 kWh usable battery charged from 20% to 80%, the battery-energy change is 36 kWh. With losses defined as 10% of grid energy, the supply requirement is 36 ÷ 0.9 = 40 kWh. Adding 10% to 36 would use a different loss definition.

Enter actual prices and additional fees

Multiply billed energy by the relevant tariff. At an illustrative 0.25 currency units per kWh, 40 kWh costs 10; at 0.60 it costs 24. These are arithmetic examples, not current electricity prices. Public sessions may also include time, session, idle or subscription charges. Home installation costs and fixed standing charges are separate considerations; decide which are incremental to your comparison.

Make monthly costs reflect driving

A single charging session is not a monthly budget. Use annual distance and realistic battery-side consumption, then allow for charging losses. Divide annual variable energy cost by twelve to obtain an average month. Seasonal driving and tariff changes can make individual months different. For mixed charging, calculate each share with its own price and avoid presenting a home-only tariff as the whole budget.

Compare convenient access as well as price

Document where you can reliably charge, at what times and under which tariff conditions. A low published rate may require a subscription or restricted hours. Check those terms directly before making a financial commitment. EVVerity accepts local prices manually, so the calculation remains usable without a price API. It cannot verify your tariff, account eligibility or future charging availability.

Calculate a mixed charging budget

Assume, only for this worked example, 15,000 km per year at 18 kWh/100 km and 10% losses as a fraction of supply energy. Battery demand is 2,700 kWh; grid demand is 3,000 kWh.

Compare a subscription on its own terms

If a subscription costs 10 currency units per month and reduces the energy price by 0.10 per kWh, its simple fee recovery requires 100 kWh of eligible charging per month. Below that, the fee exceeds the modelled tariff saving; above it, the saving exceeds the fee. Check that the advertised reduction applies at the stations and times you use, and include any other charges. These numbers illustrate the method only. For a home-charger installation, obtain a scoped quote and compare that one-off cost separately from the recurring energy bill.

Before you rely on the answer

• Are the shares based on energy, rather than the number of sessions?
• Do the tariffs include tax and all applicable fees?
• Would a change in home charging access alter the comparison?

Worksheets and numerical scenarios are original EVVerity editorial examples. They are not observed vehicle results or market-price data.