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.
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.
