The Future of P2P EV Charging

It depends on the charging point and the car, not just on the battery size. A 75 kWh Tesla Model 3 Long Range charged from 20% to 80% takes about 6 h 50 on a 7.4 kW single-phase home wallbox, about 4 h 30 on an 11 kW three-phase wallbox, and about 57 minutes on a 50 kW DC fast charger. Our simulator models the real charge curve, the taper, temperature and charging losses for 527 vehicles.

On the STEG low-voltage residential tariff the all-in price depends on your monthly consumption bracket: roughly 0.219 TND/kWh in the 101-200 kWh tranche, 0.264 in 201-300, 0.402 in 301-500 and 0.482 above 500 kWh, VAT and levies included. Charging a 75 kWh car from 20% to 80% draws about 49 kWh from the plug.

Yes, and it matters more than most people expect. STEG applies a single rate to the entire month based on total consumption, so crossing a tranche re-prices every kWh of that month. A 49 kWh charge added to a 270 kWh month costs about 57 TND — roughly 1.17 TND/kWh instead of 0.40 — because the whole month is re-billed at the higher rate. Charging at a host keeps your own bill inside its tranche.

Tunisian electricity is about 97% natural gas, so an EV here is not zero emission. A Tesla Model 3 emits around 71 g CO₂ per km on grid electricity against about 150 g/km for an equivalent petrol car — roughly 53% less, or 1.2 tonnes a year at 15 000 km. Charging from a host's rooftop solar instead drops it to about 6 g/km.

No, but it delays them. Building a 75 kWh battery emits roughly 5.3 tonnes of CO₂ up front. On the Tunisian grid the electric car repays that after about 66 000 km — around 4.4 years at 15 000 km a year — and sooner on solar or with a smaller battery. Against a very frugal diesel the payback stretches to about 106 000 km.

527 versions from 63 manufacturers, using real battery capacity, AC and DC charging limits, pack voltage and cell chemistry from the Open EV Data catalogue — including models common in Tunisia such as the Dacia Spring, Renault 5 E-Tech, Peugeot e-208, BYD Dolphin and Tesla Model 3. Any car not listed can be simulated by entering its specifications manually.