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Does anyone know if you can charge the Model S while it is on? Let's say you're on a road trip and need to plug into a 50-amp service outlet at an RV park, and would like to take a nap in the car while it's charging. But, it's a little chilly outside so you want to run the cabin heater. Can this be done while charging the car?
You should ask Tesla. The Roadster has to be "off" while charging, but the Model S is supposed to be able to maintain cabin temperature when it's parked.Originally Posted by elecblue
Roadster #919, Model S #2006
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Great question for the FAQ.
Hopefully includes ventilation. And maybe music. Maybe even a wake-up-(music-)alarm when a) charging has finished, or b) for a certain time.
Buying an EV is one thing, being able to drive it beyond city limits another...
The Roadster has a single A/C and can't handle maintaining temperatures in two places at once, so it has to switch between power train and cabin. Model S has twin compressors so in theory it should be able to handle both.
Operating any Model S features while charging will be drawing from the battery you're charging, so however small the draw you will also be extending your charge time.
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Hopefully it would be drawing from the grid and skipping a detour to the battery.
From what I understand, it can be done. BUT as suggested it draws from the battery pack, thusly extending your charge time.
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How would you do that?
The charger is delivering X amps which goes into the battery. But if you dray Y amps for running the car you're charge will be: X - Y = charge
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In the roadster, charging and driving is from the same PEM, right? Charging, the PEM runs AC -> DC. Driving, the PEM runs DC -> AC. But, only one way at one time. Hence those discussions about towing a generator to charge while you drive won't work, and the roadster won't turn on while the charge port is open.
Now, again in the roadster, 12V accessory power comes from a 12V converter in the ESS, and that is live while charging (otherwise VMS wold have issues). HVAC operates from the 400V output of the ESS, and is converted (to what?) by the orange box in the front trunk. The roadster can run the HVAC during charging, but can't direct the cool to the cabin, but I suspect only because the A/C can't be turned on without the car on. No electrical reason why not (unlike driving and charging).
So, what's the arrangement with the Model S? Sounds like the PEM and charger are two separate devices.
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The Roadster actually diverts the HVAC output according to thermal control limits; that's why stopping at long traffic lights is such a PITA in the Florida summer. Model S has two compressors, one for the cabin and one for the powertrain so it's not diverting HVAC output back and forth.
OT, the Roadster HVAC could never manage cabin and powertrain temperatures simultaneously; in theory Model S HVAC(s) could.
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