you should just put a 100-150A subpanel in the garage, then breakers/wire can be run off that panel to the EV charger(s)
of course it depends on the size of the service in your house, you can't run a 150A subpanel of a 100A main panel

Ha...yes, just last year redid the main panel (the old one was 45 years old). We were adding a pool to the back and needed some more amperage and also wanted to move the panel from the back of the house to the side. Our old box was only 100A. Our new box is 200A. So we have some power to spare. Though not 150Amitch672 wrote:Gavin,
you should just put a 100-150A subpanel in the garage, then breakers/wire can be run off that panel to the EV charger(s)
of course it depends on the size of the service in your house, you can't run a 150A subpanel of a 100A main panel
Steve, It's worse than that, you have at least (3) conductors, netural, hot, hot, and in some cases the electrical inspector will make you run a #8 ground as well (bonding), you would need at least a 2" conduit (bigger is better), and a cable puller, you can't real do it by hand.sjfotos wrote:Wow Gavin,
All I know is that I sure don't want to be the guy who wrestles a 3 gauge line from my panel to the garage and that is a short run! Very interesting....all sorts of things for me to think about here....thanks for the original question....
Steve
Warning - getting OT here!garygid wrote:I had to remove the 150-amp input breaker on my 150 amp service box, and replace it with a 110-amp breaker when I added a 40-amp breaker to connect my 7kW PV system into the service box. So, now at night, I can only draw 110 amps, not 150! The reason, a 150-amp "rated" metal "service" box is not allowed to have more "possible" input than the box's rating.
I ran into that issue, too with my house. I currently have a 100A panel and the main feed wires are only rated to 125A. Upgrading to 200A service means running new wires (which are buried) up to the latest code in a trench to the street. At the street, the trench actually needed to be 3" deep thanks to the handhole it would be connecting to. There are all sorts of crazy requirements for the trench - only 2 90* bends allowed, 2" PVC conduit, feed entrance can't be within 3" of the gas meter (and right now my gas meter is right under the main service panel), has to be filled with proper material, etc.garygid wrote:And, if I wanted to put in a higher-capacity service box (even if I stayed with the original 150-amp breaker), SDG&E said that they would require me to trench out to the street, approx 28" deep and lay in a conduit. They would inspect and pull in the new wires required for the (potentially) larger demand. The trench would have to cross all the other utilities except water (gas, phone, cable, and the existing electrical conduit).