You'd be very surprised how easy it is to hit 100 amps. I know, because I've almost hit it - Saturday afternoon this past weekend.
- Pool pump on high speed (gas heater was running)
- The Volt was charging in the driveway
- Dishwasher was running
- Central A/C was running
- Load in the washer
- Load in the dryer (Gas dryer, but still uses 110V for the drum and such)
- 3 elements on the stove, preparing dinner.
We have a 200A service, but look at it this way - if we had a second Volt (which is likely to happen), in this situation above with a 100A service, well, if both were charging, we'd have popped the main breaker.
For someone with an EV that charges at 30A vs the Volts 16A this would be even easier to hit. Now picture 2 EV's charging at 30A each.
It adds up fast. Add in some baseboard heaters and maybe an electric hot water tank and you could easily exceed 100A with an EV as part of the mix.
1000KM with zero gas. Even I'm jealous LOL, I think the most we've accomplished was 300KM or so over a 4 day weekend.
What part is broken, out of curiosity?