The nameplate for the HPWC has 100A for 80A charging. However, the instruction manual for the HPWC lists the multiple breaker sizes (everything from 15A circuit to 100A). Most inspectors have been ok with using that information, but a few have not.
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Anticipating Dual Charger with Wall Connector
- Thread starter Vince Cobelo
- Start date
The nameplate for the HPWC has 100A for 80A charging. However, the instruction manual for the HPWC lists the multiple breaker sizes (everything from 15A circuit to 100A). Most inspectors have been ok with using that information, but a few have not.
adelman
R 539, S VIN S44, X Sig#1
Why not install a HPWC set to 50A breaker size using #3 copper wire. You're allowed to oversize the wire, and that way, it is a simple upgrade later to higher currents (for example, if you upgrade the house service, or decide that other loads won't be in use at the same time and you're willing to go over what the code says). You'll need to use a split-bolt splice inside the breaker panel, as #3 wire won't fit into a 50A breaker. You could do the same with a 14-50; heck, install #3 wire on a 30A breaker and put
in a NEMA 14-30 receptical (you'll need to splice the #3 wire down on both ends). When the inspector leaves, swap it for a 14-50 and 50A breaker.
Then be careful to manage the current drawn in the cars not to overload the main house breaker.
Ken
The argument from some inspectors is that the nameplate requires a 100A circuit (including breaker) to be installed to the HPWC because that's what the nameplate says. I agree with you that future-proofing is a good thing to do if you can - but in some cases, inspectors are forcing a 100A addition to the load calcs.
modelx007
Member
Show them the manual from the HPWC (it's online), where it says that multiple breaker ratings will work.
I've been talking with some folks in Tesla about being very specific about multiple current settings on the nameplate itself, like those hot tubs I mentioned earlier... e.g.,
Charging Current (continuous) / Minimum Circuit Ampacity / Maximum Overcurrent Setting
12A / 15A / 15A
16A / 20A / 20A
24A / 30A / 30A
...
That would be an official multi-current designation that would cure those inspectors of their concerns.
modelx007
Member
The HPWC also comes with a hard copy of the manual. That might be easier for some inspectors to accept than something online. That's not to say that there aren't tech savvy inspectors but many still carry around code books.
modelx007
Member
SW2Fiddler
We Are Cognitive Dissidents
Speak with the Inspector him/herself instead of the electrician, would be my advice. Then you'll know if it will be approved as a 50A load. Theirs is the opinion that counts.
My HPWC is installed on a 70A circuit. Same reason as you would install yours on a 50A breaker. Have the #3 wire as well, may upgrade the house supply later.
(Mine is an "Old Style HPWC," they had a 70A configuration, which gives me 42 mph charging - Model S with dual chargers)
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modelx007
Member
FarmerDave
Member
I got mine last month in about 5 working days. Faster than I could get the electrician out to install.
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