Really depends on what you have readily available (ie)
15 amp breaker and outlet to use with the 12 amp charger supplied with the car.
20 amp breaker and outlet to use a 16 amp charger?
30 amp breaker commonly used for dryers etc...I believe you mentioned this is what you have.
Most 16 amp and up chargers have several plug configurations to fit various NEMA outlets. You need to figure out which configuration you have available. Availability is only one thing to look at...you also need to know what else, if anything, is using an outlet that is running off the same breaker
You want to use for the charger.
As an example...my 12 amp charger runs off a 15 amp breaker which is only used for two garage door openers...nothing else. So in my case, I can safely run the charger off this breaker.
More commonly, folks may have a 15 amp breaker but it is already being used by a freezer, door openers, maybe a table saw... whatever. Point is...if you hook the charger up to this same breaker, the draw of electricity can easily exceed the recommended capacity if several of these items run at the same time. That's why electrical codes exist.
My advice...either do your research and fully understand what you have and what you can safely do with it...or get some advice from someone who understands the situation.
Look on Amazon and you will see several chargers rated at 16 amp and higher.
Google NEMA plug configurations to see the wide choice there as well.
Just make dang sure a+b=c before plugging anything in long term. Electrical codes exist for a reason.
Hope this helps.
Last edited by Clarity_newbie; 11-22-2018 at 08:14 PM.