Two Teslas in the Garage but One Charger....

Two Teslas in the Garage but One Charger....

My Model S is a year old and have a Model X reserved for 2015...
Don't think that the Wall Charger cable will reach both so we will have to move the cars around to charge them.
Hmmm...could Tesla offer a "right hand" (IE, on the passenger's side) charger port on the Model X so it will be close enough to reach? Or a longer cable?


NumberOne | 25 juni 2014

Unfortunately everyone else who have already had their HPWCs installed planned on everything being standard, so I doubt it is going to change.

The driver side rear is simply the most logical location. My intention is just to park the cars close to the HPWC on alternate days. Of course a slightly longer cable is a possibility, especially since Tesla does sell replacement cables already.

cathygardner10 | 25 juni 2014

Geez...I am counting on using the charger from my husband's "S" for my X ... I better get out and measure. We mounted it on the wall just inside the garage door, anticipating that it would eventually take care of two cars - I think it can cover the distance....

petero | 26 juni 2014

Jhbeak. How are you charging your MS now (Wall Charger or Mobile Connector)?
If you are using the MC ask your electrician if you can add a second outlet. You could plug your two MCs into each 220-240 outlet and set the timers in each car so one car charges at a time.

The MC cords should be long enough. Just a thought.

jdb | 26 juni 2014

I'm planning to just rotate vehicles. With HPWC in garage can easily charge one vehicle when get home from work and then before going to bed for night spending a few minutes rotating cars and putting charger into other vehicle.

bevguy | 26 juni 2014

NEMA 14-50 extension cords are available and work fine. Make sure the wires are the right gauge. On line calculators are available to size them so that there is less than 1 volt current drop. I know Tesla doesn't recommend them but they are used in the Service Centers.

Brian H | 26 juni 2014

Take turns, every second day. Unless you use more than half a 90% charge per day.

Laryrob | 27 juni 2014

agree re every second day.Luckily my cord will reach both when in the garage. May do a second 240 outlet though

jjs | 27 juni 2014

For those with an existing 240 outlet wanting a second 240 outlet in the garage and
a) don't have enough amps coming into the house, or
b) don't want to pay for running it all the way from the circuit box
you could have a second outlet put in the garage on the same circuit. Then dial down the amps for charging at this location to 1/2 of 80% of the rated circuit.

Example: You have a 40 amp 240 circuit running to your garage. (40 and 50 amp 204 circuits are the most common size). You should never run more than 80% of that for an extended period of time so that takes us down to 32 amps. For one car this would be about 24 miles and hour. If you dial it down to 16 amps you can both be plugged in anytime you want, no need to swap places or trade turns. Each would charge at about 12 miles per hour each night.

If one of you drive more than the other the ratio does not have to 50/50. 20 amps and 12 amps, 25 amps and 7 amps, etc would all work fine as well.

The above configuration is not right for everyone, but in some, perhaps many cases, this would be a good solution.

Brian H | 27 juni 2014


jdb | 1 juli 2014

Good point Brian H. Every other day refueling at HPWC would work, rarely drive Model S more than 125 miles in day. And on those occassions when drive both vehicles a lot with the HPWC could rotate later in evening. Not a big deal.

Ohmman | 2 juli 2014

jjs - only downside to your setup is the loss of efficiency since it has been shown that the lower the amperage, the lower the charging efficiency. Counterintuitive at first glance, but true. Convenience is likely worth the lost efficiency. Swapping each day would be hard to remember, at least for a guy like me.

jjs | 2 juli 2014

Ohmman - Indeed there is a cost in lost efficiency. Does anyone out there have any specifics on how much is lost? 10% 20% more?

Sin_Gas | 4 juli 2014

I can't believe it. You can pop for almost 200 grand for 2 cars, and you want to cheap out for a couple of grand for an additional charger? Does this make any sense to anyone?

Sin Gas

jjs | 5 juli 2014

Yes there are a number of variants where this makes sense. If you live in an older home your house is most not likely wired with enough amps to the house. The expense, mess and time to do this may not be as desirable as less invasive measures.

You may have solar panels and don't want any/additional amps run to your house from the grid.

You may rent and have little or no control of additional outlets/wiring.

As I said above there are a number of reasons.

Sorry to be rather blunt, but this makes more sense than assuming all are in your situation and asking "Does this make any sense..."

grega | 13 juli 2014

I wonder if a software upgrade could have 2 cars balance their charge load on a 240v setup.

the bonnie | 13 juli 2014

Just set the timers for starting the charge on each car to ensure that one starts after the other will have finished.

jdb | 13 juli 2014

To follow up with @Sin_Gas and @jjs, many reasons not to want or need two chargers in garage other than price, which is not issue. In my case the two car garage is now one car garage since a large part has been taken over by riding lawn mower and power tools and extra refrigerator and kids bicycles and wife's gardening supplies, I would get in big trouble to evict those for purpose of installing another charger to park second vehicle which in any case would not be necessary. The HPWC is more than sufficient for every other day charging or if needed, simply rotating vehicles in evening.

grega | 13 juli 2014

you'll never have 2 teslas in your garage though right, which was the thread question

jdb | 14 juli 2014

Correct unless I built a backyard utility shed for all the other stuff which is possible, but even then would not plan to put in additional charger, think one HPWC is sufficient.