Forums

Is it safe to stay in the car while supercharging?

Is it safe to stay in the car while supercharging?

Hello,

I was sitting in the car while it was supercharging the other day and thought that that kind of current could be lethal if something went wrong. Any thoughts about this?
Regards,
Denis

July10Models | 11 februari 2013

The superchargers are DC(direct Current) with no ground reference. Unless you managed to touch both the negative terminal and the positive terminal which are sealed by the connector, you can't get electrocuted. However, you may get a high voltage static charge when you exit the car base on conditions but this is harmless and is normal for cars. The good thing with the pure EV there is no gasoline near by to ignite with spark from static discharge :-) some people on this board will tell you to get out of the car because of high EMF. Let the flames begin.

Brian H | 11 februari 2013

EMF stands for Electro Magnetic Frequency. The frequency of DC is zero. Therefor the EMF of a Supercharger is zero.

Brian H | 11 februari 2013

Actually, EMF is Electromagnetic Fields; however, the effect of such fields is in their variation, or on-off frequency. DC doesn't vary.

Kleist | 11 februari 2013

Brian - the F is for field. Otherwise well stated.

July10Models | 11 februari 2013

@Brian H
That would be well and good for a steady state of charge and discharge on the battery. However there is always a magnetic field perpendicular to current flow. Since the current is changing with time as the battery charges the magnetic field collapses as the current decreases creating a varying EMF. This can be measured with a Hal effect device and it looks just like the charging curve of a capacitor, an EMF Pulse.

Brian H | 11 februari 2013

July10;
surely that must be a slow non-periodic change, not able to generate much "collapse" or "varying EMF".

drp | 11 februari 2013

Dia

Aren't you glad you asked?

drp | 11 februari 2013

Sorry, I meant dlaprise

mthanos | 11 februari 2013

If people are worried about the field of supercharging they shouldn't buy the model S!! Supercharging is only 90KW while actual driving it can be over 300KW. Let's get real!

c.bussert67 | 11 februari 2013

Here's a better way to look at it. Yes, I enjoy sitting in the car at superchargers. Looking at the miles click off at a rate of 207mi/hr just amazes me. (That's what I was getting at Barstow)
If all that power scares you, rest assured, the awesome design of the S also makes for a wonderful Faraday cage;-)

dlaprise | 11 februari 2013

Thanks for the great answers!

Stark | 12 februari 2013

Luckily, EMF follows the inverse square law: http://en.wikipedia.org/wiki/Inverse-square_law

So, as you move away from the source of the field (the SuperCharger), the strength of the field decreases by the square of the distance. Also @mthanos, I think (someone correct me if I'm wrong), I recall reading that the motor is shielded to protect occupants of the car from strong EMF, so the risk is reduced while driving.

Just for fun, take an EMF reading from your Microwave, fridge or coffee maker. Even better, an old school CRT monitor. How many hours did you spend soaking up radiation in front of a CRT back in the day? Radiation is delicious :)

mrspaghetti | 12 februari 2013

Statistically it has to be safer sitting in the car while supercharging than driving it on the road with all those other crazy motorists.

jbunn | 12 februari 2013

I'd say stay in the car. What you don't want to do is stand by the transformer coming in from the street. lol.

Brian H | 12 februari 2013

jbunn;
take a pocket compass and see if you can make it pinwheel! At 60 rpm, of course. ;)

dstiavnicky | 15 februari 2013

Stay in the car... but go to the furthest possible location... the FRUNK ;)