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Level 2 Charging Question

7196 Views 38 Replies 19 Participants Last post by  wassct
I'm sorry if this has been asked before but I'm a bit confused. I have a 2018 Volt Premier and I'm looking to install level 2 charging at my house. I have a couple of questions because I read that I should have a 40amp breaker in the panel and I thought I could use a 30amp for the Volt. I'm also interested in being prepared for the future as much as possible without having to run a new line.

(1) Can I get away with this? Install a 30amp breaker in the panel with a 30amp line run to garage into a 240v 30amp outlet?

(2)Am I better off running 40amp or 50amp line from the breaker to the garage with the 30amp breaker and outlet (or do I need a 40amp breaker and outlet?)?

I have gotten some quotes and the higher amp line run is obviously more expensive so wondering your thoughts if I want to keep cost reasonable but also future proof. One of the electricians mentioned that he believes the amp ratings will come down in the future anyway, is this true?

Thanks for your help for a new and slightly confused Volt owner!
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The breaker needs to be sized for protecting the charger (and interior wiring). If you get a 50A charger, it will work fine with the Volt, as it will negotiate the right current with the car, and then turn off the charger if the car exceeds the negotiated rate. The car won't ask for more than it needs. There are also dual chargers, which divide the current between two cars, until one of the cars needs less or no charging, and then the other car will get the rest. This can be one charger with two cables, or two chargers which communicate with each other.

This negotiation is what makes the charger expensive. It has to monitor the current in use, and be able to turn it off for safety. One other thing to look for in a charger is UL certification. You don't want some poorly built charger burning your house down. There are several companies who do this certification to UL standards, including UL, CSA, and TUV. Certification ensures the design and manufacturing of the charger meets the UL safety standards.
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