I have a 200 amp panel. Today that's fine, but my home is heated by gas, my food is heated by gas, my pool is heated by gas, and my transportation is powered by gasoline.
Let's be naive and say that the panel was properly provisioned for the loads in the house when it was built in 1975. Now let's switch out gas heating for a heat pump, costing us 40 A. Induction cooktop? 50 A. Oven? 50 A. Two EVs? 100 A. Pool heater? 50 A.
Having a 400 amp panel quickly starts to sound pretty good. On the other hand, so does having a huge solar array and a bunch of batteries. But code and permitting and PG&E does not smile on such beefy residential installations.
Let's be naive and say that the panel was properly provisioned for the loads in the house when it was built in 1975. Now let's switch out gas heating for a heat pump, costing us 40 A. Induction cooktop? 50 A. Oven? 50 A. Two EVs? 100 A. Pool heater? 50 A.
Having a 400 amp panel quickly starts to sound pretty good. On the other hand, so does having a huge solar array and a bunch of batteries. But code and permitting and PG&E does not smile on such beefy residential installations.