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Benefits of HPWC?

Does anyone know if there are benefits to getting the HPWC option versus just having an electrician install a 220V outlet in your garage (besides the aesthetics)? $1,200 seems like a lot. How much would it costs to have an electrician do it?

I'm trying to find options that I can forego in order to offset the cost of upgrading to the 60kwh battery. I. definitely skipping the panoramic roof and the air suspension. This is my next target.

@Bennett R

You only really need the HPWC if you are getting dual chargers.
The HPWC will not require you to use an adapter when charging and of course looks nice but is not necessary to charge with the single charger. If you're not getting dual chargers, then a NEMA NEMA outlet is all you need.

Meant NEMA 14-50

…Stupid lack of an edit feature

Reminded me of Woot! Woot! and Pizza! Pizza! :)

The HPC and adding second charger in the vehicle gives you up to 80 amps, meaning you can charge at 62 miles per hour. The simple 14-50 at 40 amps and the single charger is 31 miles per hour. Thats 1200 plus 1500 bucks cheaper. The electrician cost to install either is roughly the same depending on how tough running the cable through the house will be. And you can always upgrade later (if you run cable capable of the 80 amps).

Look through this forum and the Tesla Motors Club forum for much discussion on this.

Running the wires for 80Amps is significantly more expensive than for 40 amps. If you don't need the 61mile per hour charge, I'd go with the single on car charger and just the NEMA 14-50 receptacle installed by an electrician.

I'm getting the Signature, so it comes with both internal chargers, but will only be installing the NEMA 14-50 since I don't need the 61 mile per hour charge and I don't want to pay for the $1200 HPWC.

Always nice to have a backup charging unit around too so getting the HPWC in additon to the units provided by Tesla gives some redundancy. Of course you could always buy a second set of the UMC cables too. Also, although I will likely never use the full 80 amps at home myself, I might have some visitors that would like to use it.

I'm thinking of having at least 2 NEMA 14-50 installed at my home. One in the garage (which is detached from the main house and recessed from the street by over 100 feet) and one near the front of the house. This will allow me to charge in the garage or the front of the house. The one in the front can be used by people visiting. It just turns out that the one near the front wilil be 3 ft from my electric meter - so cost should not be too much to install.

Nema all the way

Even if you get the HPWC, you still might want to run a NEMA so that you can have a visitor's Tesla plugged into the HPWC and yours plugged into the NEMA. The cost of running both is really only the extra NEMA wire.

In Los Angeles DWP reimburses up to $2,000 for the installation of a dedicated EV charger (like the HPWC). Solar City is charging me $1,300 to install the HPWC and $1,200 to purchase it so the whole thing comes to $500 after rebate. Can't beat it. Without the HPWC I'm on the hook for $1,300.

Someone please correct me if my info is wrong. Just quoting the solar city rep.

I installed a NEMA 14-50 in my garage for $400 with my own electrician and put the money saved towards the other options in the car.

While I'm reasonably sure that the 62 mph charging capability will seldom if ever be needed when I'm home, I did configure with dual chargers to be able to take advantage of higher amperage charging equipment / stations I might find in the wild when charge time reduction would be welcome. and I'm located approx. 120 miles from civilization "East of Tucson" so if there will need a near fully charged pack to reach home again. (60 KW)

That said I plan on installing three NEMA 14-50 outlets @ home (one accesible from outside "for guests? travelers? or me needing some amps" if parked in the driveway) I plan to size the circuit @ 100 amps. Additionally once operational I'll be listing my home on "Plug Share" to assist those needing an opportunity charge.

Why one might ask? Well I'm using the theory "do it once, do it right". That will allow me in future??? to install higher amperage charging equipment without going back and pulling new wire. Adding a second BEV perhaps, allowing a friend?? to charge at the same time without interrupting my cars charging needs?? Or at some point down the road installing higher powered charging equipment etc.


Sure with those incentives were in play in rurual AZ. That's a no brainer.


Where is your panel relative to the outlet you had installed? Also, did you have the wires run inside the walls or outside with conduit? Just wondering.

My brother is an electrician and we have priced out the 14-50 outlet for my garage. Turns out the cost of the wiring, outlet & breaker is less than $50. Mind you, my panel happens to be in my garage right where I will be parking my Model S, so not a whole lot of wire or conduit involved. And of course, I get the "brother" rate on labor [$0/hr, with a promised couple rides in the Model S...]

@dschulner - do you know if those incentives will also go towards a necessary panel upgrade? I'd have to bump my 70 amp panel to a 200 amp to install the NIMA in my garage - would that expense be part of the rebate from LADWP?

I am just getting a NEMA 14-50 outlet installed. 99% of the time, it will take less than two hours of charging to fill up after a day's worth of driving, for me. I doubt I would get much, if any benefit from installing the HPWC, and I coult always get it later, if need be.

I did however, order the Twin Chargers. I'm also kind of worried that this will be a waste of money, but since it's more or less of a "permanent" choice, I decided that I would rather have it and leave my options open.


My thoughts exactly on going with dual chargers worth it? not sure, but I can't get a do over and as higher powered charging options appear in the wild seemed like they were worth having.

what happens if I have electric outlet 240V / 80amp, can I charge from it 20kW with twin charger (but without HPWC)?
It doesn't matter if this outlet is in my house or somewhere in the wild... I'm just curious...

I did not get the twin chargers. I can easily do a full charge for my P85 overnight with just a NEMA 14-50 outlet. By the way, if you ever change your mind and want a second charger, it's easily added. However, I am running a 100amp line to my garage to a subpanel. Then a 50 amp line to the outlet. This gives me the option to add a second outlet for my wife if she also gets an EV.

@archibald - don't know. But a quick call to solar city will answer your question.


I don't see why you couldn't wire up a 240v/80amp charger without the HPWC, as long as you could physically connect it. I guess you could make it a J1772 so you could just use the adapter that comes with the car. Not sure how much that would cost, but I bet it'd be less than $1200.

But personally I don't plan to bother with a HPWC, just the twin chargers for occasional road trips and a 14-50 in the garage.

J1772 is more than physical connector specifications. The power side needs to handshake with the car before current can flow.

Reminder for residents of WA: installation or upgrade of charging equipment is tax exempt with the proper form.


I wondered the same thing, If the power was available at the plug if the Nema adaptor could flow @20kw ??
My gut tells me no hence Nema "14-50" as in 50 amps "that would be to easy" as there would be no need for the HPWC.

Although I couldn't find it specified anywhere, the Tesla Mobile Connector may not be able to handle power above 40 amps and that's why Tesla recommends the HPWC for higher amperage home charging.

The J1772 adapter is 80 amp capable, but that connects directly to the Level 2 charger. The Tesla Mobile Connector is not used:

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