2013 Tesla Model S Long-Term Road Test

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2013 Tesla Model S: Revised High Powered Wall Connector In-Hand

July 31, 2013

2013 Tesla Model S

Just over a month ago we found out that our as-yet-uninstalled Tesla HPWC (High Powered Wall Connector) contained a flaw that would prevent it from working at the 80-amp charge rate it's supposed to. Internal fuses were blowing in customer units in the field, leading Tesla to send out a software update to all vehicles to prevent them from drawing more than 60 amps until they had a fix.

We learned about all this through a Tesla message board, but we'd heard nothing from Tesla directly. So we put our installation plans on hold and gave them a call to find out when we might get our hands on a revised one.

It arrived on my desk while I was on a business trip last week, about 4 weeks after I put in the call.

Here's what a new HPWC with "the fix" looks like inside.

2013 Tesla Model S

A pair of 200-amp BUSS fuses sits crossways in the housing.

2013 Tesla Model S

Yes, there are two of them. One is stacked atop the other. You'll notice that the brackets they mount to have been replaced so the fuses can sit 90-degrees from their original orientation.

In case you've forgotten, here's what the old one looked like before the upgrade.

2013 Tesla Model S

The questionable fuses were 100-amp units supplied by Edison, of all people. These beefier 200-amp units ought to do the trick.

Now we're ready to restart the installation process in earnest. But it's not as simple as that. Our electrician has gone on vacation.

Dan Edmunds, Director of Vehicle Testing @ 6,576 miles

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