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Need 240V 20AMPs in detached garage for 16 AMP Level 2 EV Charger (Chevy Spark) at my MIL’s home.

1200 sqft House, has a 100 AMP Panel. Furnace, Dryer, and Stove are Gas. All circuits are 20AMPs, and currently unlabeled. Only 240v appliance is 20AMP for central AC.

Garage is currently fed by 20AMP circuit from the main panel via Underground conduit run (probably about 25-30feet). Feeding a couple lights, outlets and 2 car garage door opener. No heavy equipment in garage

Here’s what I’m thinking:

• On Main Panel: Upgrade 20AMP single to 30AMP double
• Pull out existing Romex run, upgrade to 10/3 to feed garage Sub Panel
• Garage Sub Panel: 1 20AMP double(Dedicated for EV), and 1 15AMP single(outlets, lights, etc)

Updated Information

• The Main Panel has 12, 20 Amp Circuits @ 120(Including the garage I want to switch to a subpanel 30 @ 240). And 1, 20Amp @ 240 for Central AC.

• Pipe feeding the garage is 1 inch.

• If it can support running a 50AMP subpanel for futureproofing Im all for it, but if its a difference of upgrading the main panel or not, I’ll take the less intrusive option.

• I used the calculator located here Electrical load Calculator and it output Total VA Load = 12600 Total Amp Load = 53.