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20 mile daily commute: do I need HPWC?

My daily drive to work is only 7 or 8 miles. At lunch I typically go somewhere close by to eat. So an average daily commute for me is only about 20 miles. The Tesla website suggests I would be fine just plugging into the 110 V outlet in my garage. What have other people with low mileage commutes found? Is it OK to get the car without the HPWC?

HPWC is unnecessary.

I have a ~30 mile daily commute and have been getting along just fine without the HPWC.

You should get a NEMA 14-50 outlet installed though. There's plenty of information about that on the Tesla site (Model S > Charging) and on these forums.

I drive over 100 miles a day, and would be just fine without the HPWC. A standard dryer outlet (220V) would be just fine. I did get the HPWC "just in case" and have found it to be handy once, but generally I would be fine without it.

A 110 V outlet will get you about 4 miles/hr charge. If you charged 10 hours overnight, you'd get around 40 miles charge. But, once you get your car, you'll probably find yourself driving more than just the 7 or 8 miles each way to work.

Twin chargers are also unnecessary.

No way do you need the HPWC. If you are getting a 60kWh car, plan to do 100+ miles, come home and then go out a few hours later then maybe.

For you....
20 miles at c. 350Wh/m is 7kW. You could loose about 3.5kWh from vampire drain. So 10.5kWh

Assuming you charge from 6:00pm to 8:00am (14 hours), with 120V at 12A will give you about 17kWh after charging losses.

So you should be good to go. But be warned - some people have reported that 110V at 12A can barely keep up with the vampire load on the car sometimes. If you wiring is not good, or if the heat/cold is excessive you either won't get 17 kWh, or you'll use more than 10.5

If you have room on your panel I'd drop in a NEMA 14-50 outlet, even if you can only run it at 20A you are going to get 57 kWh - or 5x what you need.

Although it is probably not an item that more than 2% of owners would ever need, it is still a cool item to have. In Ontario, we receive a $1000.00 credit for the EV electrical hookup, but it must involve an approved EV charging unit such as the HPWC.
This reduces the cost by a grand, so it is an easy decision to make.

You also get a federal tax credit equal to 30% of the cost of the charger. This credit falls under installation of EV charging infrastructure and is applicable to residential EV installations. So spending $1,200 for the HPWC gets you back $360 in federal tax credits. A tax credit is not like a deduction. A tax credit reduces your tax obligation, a tax deduction is a reduction in your taxable income.

http://www.pluginamerica.org/incentives

14-50 with a single charger would be more then adequate. You could scrape by with a 110v however if your driving pattern changed it would not be enough, it would certainly do initially whilst waiting for a 14-50 installation.

I would also say no. I have an 80 mile round tripper daily. I can charge at work on 110, but I never seem to need the extra charge. Actually I go all week charging at 110 at work, then charge at home the last night and repeat. My range has never dipped below 100 miles (85kwh).

I would second everything already said here. I have a 50 mile commute one way, and I'm not getting twin chargers or a HPWC. A 14-50 Nema outlet is all you need. The superchargers bypass all onboard charging systems anyway.

100 mile daily commute. Have a 14-50 and regenerate my losses in 3-4 hrs. Have only charged outside my home to try it out such as Hawthorne supercharger and Ontario airport but wasn't needed. Have a 220 mile day trip coming up so I will likely get a top-up somewhere for security.

@amped the tax credits for ev charge station I believe don't work if you pay amt which I would guess a good number of folks that buy Teslas fall into. Unlike the EV tax credit which does work for all.

If you're only doing 20 miles round trip each day, you could even get by with 120V, 12A. But I'll still recommend putting in a NEMA 14-50 outlet.

The 30% tax credit also applies to your NEMA 14-50 installation (It is after all an EV charging station that would otherwise not be in your garage)

Haven't gotten my 14-50 wired yet, so I've used the 120V outlet without a problem despite giving about 100 miles of test drives a day this first week of ownership. Normally I'd commute 40 miles a day and would foresee no problem using the 120V plug. I'm consistently adding 4 MPH charge.

Thanks for all of the responses. Sounds as if it makes sense to forego the HPWC for now.

One question: if I'm charging off of the 120V outlet, what is the advantage of getting the 14-50 NEMA circuit wired? Does that allow for higher amps? Please forgive my ignorance as this is new to me.

120V adds charge at 4 miles per hour while the 14-50 will go about 29 +/= miles per hour.

NEMA 14-50, single charger, smile, enjoy.

NEMA 14-50 is a 220/240v outlet with a 50 amp breaker, your car will draw up to 240 volts and up to 40 amps current, which will translate into the 29 miles/hour for range.

Think of it this way - with a completely depleted battery, you can recharge overnight with a NEMA 14-50 (approx 8-9 hours). With just about any 120v outlet, it takes 2.5-3.5 days.

Go NEMA 14-50 and no regrets.

www.teslamodels.wordpress.com

I know of one owner who has a single charger, but got the HPWC anyway because of appearance and freedom from attaching the UMC every time he charges. Looks and convenience.

I seriously doubt you will only be driving 8 miles per day in this car once you get it. I have a friend like you that didn't drive much at all before. Now he is driving over 75 miles a day as he always finds an excuse to go run errands. LOL.

I agree with everyone. I drive ~16 miles daily and doing fine with NEMA 14-50 installed. In fact, I only charge every 3-4 days.

I have a similar commute and using 120V at work ALMOST covers the round trip (ie. I don't even need to charge at home). I have a 14-50 outlet installed for weekends and to top-off at the end of a weekday.

I strongly recommend something more than a 120V at home for weekends and the odd surprises. For comparison, a 14-50 is slightly faster than most public EV chargers.

@Windsurfer - in the Model S delivery checklist and owners guide there's a section about setting up charging at home, and links to TMC where there are some very detailed instructions for you or your electrician if you choose to go that route.

Put in a 14 - 50. You won't need the HPWC but you will find that the c at is so much fun that you take detours to and from work. Nice to always know rhat you can recharge overnight.

So, per all the above, you see that the 14-50 when properly installed gives you about 10KW which matches your single charger. If you get home with zero miles you can fill it up in 8 hours. The HPWC is double: 20 KW, requires dual chargers in the car, and you can charge an empty car in 4 hours. Just a factor of 2. Will you ever need it? Maybe once.

But another thought for you, if its a long wire run then that is where all the cost, time and effort is. You might run larger cable so that in the future you can upgrade without having to run the cable again. But really, 20 miles a day is 8-10 kWh which will take about an hour.

( but 5-8 years from now, when the cars have 500 mile batts, and your job moved way out, and you have 3 EV's to charge at once...)

If you have time-of-use electrical rates (generally meaning your utility charges different rates during different time periods of the day) then having a 14-50 will likely allow you to charge within the most favorable rate window.

120v, not so much.

And if the TOU window is made really small ...

I drive 40-50 miles daily and currently am using a NEMA 14-30 outlet and so far it hasn't been a major problem. I do have a HPWC and am just waiting for the electrician to upgrade my service panel (for PG&E E9-B) and run a 100A circuit to the garage for it.

HPWC is un-necessary for your "planned" needs - however a NEMA 14-50 is useful for times when:

a) you need to drive the car further
b) want the turn around time to be practical

I would recommend having at least a 240v/30-50 AMP circuit that when needed you can use the car's full range and not have to wait over 8 hours for it to be back at full capacity…

In you case I agree the NEMA will meet your needs. If in the future your needs changes you can always buy the HPWC for the same price online as with the car(at least the same price today).


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