What actually matters is the load calculation
Electricians calculate your home's existing demand from the heating and cooling system, water heater, range, dryer, and general lighting, then see what capacity remains. A 100-amp home with gas heat, a gas water heater, and a gas range often has more headroom than a 150-amp all-electric home.
Options when capacity is tight
Install a lower-amperage charger. Use a load management device that pauses charging when household demand spikes. Use a circuit-sharing product that shares an existing large appliance circuit. Or upgrade the service, which is the most expensive path and the last resort.
How to find out where you stand
Photograph the open panel including the main breaker rating and the breaker layout, and note whether your heat, water heater, range, and dryer are gas or electric. That combination lets an installer give you a realistic answer quickly.