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First I will start off with some pictures of what I am working with. My basic question is what would be my best option and max amperage I can use for my electric car charger? The first photo is the incoming main outside the house right below the PGE smart meter. The second is of the houses main CB panel. The house is older built in 1967 and only 1300sqft, I do not use the electric dryer CB since we have a gas dryer and also a gas furnace. The electric car charger I purchased can be set to handle anywhere from 12-80 amps.

The incoming main box is opposite side of wall where I would want to install the car charger inside the garage.

The main panel inside the house has a 50amp CB for the electric stove, 30amp CB for the AC, 40amp CB for the dryer, plus the 5 other 15amp breakers for outlets/lights.

Is it possible to add a separate second 100amp breaker box directly from the incoming MAIN to only feed the electric car charger? Or would there be a better way to do this? Want to know my options before I hire an electrician to install this.

Main CB at PGE Meter coming into the house

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  • What's the nameplate amperage on your range and air-conditioner, and how many small appliance branch circuits do you have in your kitchen? – ThreePhaseEel Dec 3 '16 at 16:43
  • With the 12-80 amps on the charger what voltage? Some chargers are 48v supplied by A 240 circuit they draw less than 1/4 of the charging amperage. The 2014 NEC considers chargers as continuous so 125% of the ampacity will be needed for the wire size. – Ed Beal Dec 3 '16 at 17:10
  • If he's talking about 80 amps, it's probably a Tesla 240V charging station. Without further analysis, I'd be tempted to say limit the station to 40 amps, effectively replacing the dryer breaker that he's not using. As to whether you can connect to the main breaker panel, we'd need to see a photo with the cover off. Do not attempt this if you're not comfortable being safe with this. – DoxyLover Dec 3 '16 at 19:46
  • It is a Tesla 240V Wall Charger, I work with high voltage in my day to day job repairing medical imaging equipment anywhere from 480V X-Ray rooms to 120V DC portable X-Ray units so I am very familiar with how to work safely with electricity. As for my range it is an LG dual oven electric rated max 40 amp. A/C I will have to check tomorrow. i will also remove the cover of the 100amp main incoming panel tomorrow and take some pictures. – Anderj235 Dec 4 '16 at 3:45

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