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32amp vs 40amp vs 50amp

64K views 91 replies 35 participants last post by  atc98092  
Is there a point in getting high amperage charging stations like 40amp or 50amp ?
As noted by the other posters in this thread, the maximum charge rate that the Bolt will accept is 32 amps.

But NOTE: that there's a difference between the charge rate of the BOLT vs. the capacity of the electrical CIRCUIT you need to install to plug the charger into. For a continuous load like a car charger, the load must draw no more than 80% of the capacity of the circuit. That means that if you charge at 32A, you need to install at least a 40A circuit (because 32A is 80% of 40A). Since the most common 240V plugs are only available in 30A and 50A sizes, in practice this means you need to install a 50A circuit.

So while the BOLT itself only charges at 32A, you'll need to install a 50A CIRCUIT to plug the charger into.
 
Are you sure Sean? There is a nuance because while there are 30A and 50A sockets, there is no 40A socket...
See the other posts between yours and this one for more elaboration. I'm just going by my general proclivity that the circuit ought be capable of delivering the power that the receptacle is indicating. That's a personal preference and not a code diktat. I just don't see any strong reason to install a 40A breaker and wiring with a 50A socket unless your panel really can't sustain the extra 10A.

But the important point remains that: (a) the BOLT charges at a maximum of 32A, but (b) you still need to install a CIRCUIT capable of at least 40A to support that.