The empty battery of an EV being charged from the fully charged battery of another EV? Will this be possible in the future?

The empty battery of an EV being charged from the fully charged battery of another EV? Will this be possible in the future?

Suppose that Mr. A had not planned his trip very well, and he has ended up somewhere along the highway, where there is no charging station nearby. First of all we will say that Mr. A should have known better before he started to drive in his EV. But it can happen.

The nearest charging station is 50 miles away.

Mr. B is also a driver of an EV, and his battery is 80% charged. Wouldn't it be nice if Mr. B could help Mr. A by transferring some energy from the battery of his EV to the battery of Mr. A's EV?

This is a very simple idea, but can it be engineered?

And if it is possible to engineer this, then maybe something else can be engineered as well:
An EV Truck with a mobile charging station on it, that can drive on the highway to help out people who have an empty battery. How about that?

ian | 28 February, 2013

As long as I don't have to siphon the electricity! ;-)

Can I also run my house off of my EV if I have a power outage?

Brian H | 28 February, 2013

Theoretically. If you have the gear required to re-convert it into AC 120V, and the legally required isolation interfaces to protect external line workers, etc., etc. Not a simple proposition.

olanmills | 28 February, 2013

How common will this scenario be though?

The equivalent of this scenario for ICE is to try to transfer gas between two cars. Granted, one reason this doesn't happen often is because of the prevelance of gas stations.

This scenario is not analogous to jump starting an ICE, because you do that when something has gone wrong with the starter or battery, or if the battery was drained accidentally through accessory use (and most late model cars have features that shut off the headlights, interior lights etc, if the ignition has been in the off position for a certain length of time).

And also, in jump starting, you are not trying to refuel the car, and thus you don't need that much energy. You are just charging enough to start the engine.

I understand that there is still a valid scenario, that you are driving your EV on a stretch of road in the wilderness or desert or something, and you run very low on juice, and there's no outlet, not even 110V, around for miles.

However, I wonder if the trouble of building a system like this would really be worth it if it was rarely used.

Brian H | 28 February, 2013


An interesting capacity, for sure, but so rarely needed it's hardly worth the candle.