Accessories and Power Use

I grew up in a town where the average temperature in the summer was at least 100 F (38 C).  It was a town where it was assumed that you had an air conditioner or if not at least a swimming pool.  And not having either was cause for living uncomfortably.  I also took a strong interest in car audio in middle and upper school.

The use of air conditioning and audio in automobiles definitely puts a drain on fuel consumption, but it is not as noticeable because the energy density of petroleum is so high.  But how does it affect the driver of an electric vehicle?

Air Conditioning

I was at first wary of using the air conditioner on the Smart ED.  I thought that it, like the heater would cut my range drastically.  It turns out, that in certain driving conditions, my efficiency improves.  Obviously I do not own a perpetual motion machine, but I've noticed that I tend to drive more smoothly with using the A/C.  For whatever reason, my driving manner is different when the A/C is on, than when it is off, regardless of the outside temperature.

The A/C will draw extra power from the pack, but unlike the heater the vehicle does not automatically take a reserve to cover for the cooler.  However, you will notice when you come to a stoplight that an exhaust fan will start up.  This fan is very loud and will make your car sound like an A/C unit on wheels.  This same event occurs on ICE vehicles, but the engine noise usually overpowers it.

Car Audio

Car Audio on the other hand, at least the stock head-unit, is powered by the 12V auxiliary battery.  And in turn the main pack recharges the 12V, just like the alternator in an ICE vehicle.  The stock speakers and stereo are not very good in the Smart ED, but they are better than not having a system.

I tested the audio in the vehicle when I bought it, but I didn't use it for a while either because I was thinking that it would drain the main pack.   In reality, after having used the radio, even at high volume, I have yet to experience a significant difference in the main pack range.

Conclusion

I have no cross-referenced trials to present, but I do have my own experience.  I've driven many times with the A/C on and the radio blasting, and have not noticed a gross difference in the main pack battery.  More often than not it is how I drive that determines the battery performance and longevity.

A serious hypermiler might consider the use of these accessories as detrimental to the extreme mileage possible, but I am no such person.  I already know that by driving electric, I am being much more efficient than any ICE vehicle, but a factor of at worst 2 and at best 20.

I am sure that there are some people who believe that by using the A/C or radio that they are giving up some range.  But if that range is 1 mile, I think I am willing to sacrifice it for the same of comfort and entertainment.

Electric Gas Hybrid Powerhouse

On Saturday,  July 12th 2014, I attended the Silicon Valley STEAM Festival at Reid Hillview Airport in San Jose. This year's event includes all the vehicles from Mike Hennessy's Hot San Jose Nights.  And although most of the event's vehicles were powered by petroleum fuel (cars,  trucks, aircraft),  there were a few electricity fueled and my Smart ED was one of them.

This event was definitely a display of the love vehicular engineering,  primarily that of the power of petrol.   But there was something  uncharacteristic in a television show from the British Isles recently,  that praised a combination of electricity and petroleum power.  The show is called Top Gear and the particular episode showcased a McLaren P1 that uses both a gas and electric motors to do something unprecedented.

As mentioned  in my previous post about electric drag racing,  electric cars have immense torque from a stand still. But they also tend not to require a transmission.   For these reasons not  only do they accelerate quickly and do not make shifts that lose power.

When electric cars race against internal combustion cars,  the electrics often win.  But if internal combustion could use electric motors,  they might be able to smooth out the rough parts of shifting and acceleration. That is exactly what McLaren has done with the P1.  

The P1 uses the electric motor for the high torque in acceleration from 0 and when the transmission is shifting to boost the power yet again.  Of course this means that  the vehicle is more heavy than an electric or petrol alone,  but with all that power, it may not matter.

Although I doubt that there will be a Smart Car hybrid,  I would not be surprised to see more companies utilizing electric motors to boost power,  not just efficiency. Where the Prius introduced the world to greater efficiency,  the McLaren P1 has brought hybrid tech up to speed.

And this would seem to all well and good until the Lithium Air becomes available.  Then petroleum powered vehicles will finally become a relic of a bygone era.

Under foot

For those who are aware, the Smart Fortwo is the smallest production vehicle in the US market.   Outside of the Twizzy in the UK and the Tata Nano in India, it might be the smallest in the world.  It is a tiny car and with it comes both good and bad aspects.  In this episode we explore the color of the Smart ForTwo and how it affects the car.

It's been said that certain colors are more noticeable than others.  Some colors are easy to be seen, others are not.  A study in Australia at Monash University pointed out that of all the colors (or lack there of) black is the worst, followed closely by grey, and then silver for likelihood of crashes versus white colored vehicles. The report used "white" as the standard by which all vehicle colors were compared as if to say that white is the easiest to see. Of course the study included comparisons in daylight, dusk, and nighttime.  Dusk it seems holds a particular spite for black.

Personally, I've experienced more than one presumptuous maneuver when driving my Smart, where the other driver doesn't seem to grasp that my car is either real or relative.  Fortunately, with its size, the Smart Fortwo has an excellent capacity move or stop quickly if needed and I've yet to trade paint with anyone.

I am keenly aware of how much I tend to miss vehicles that are much larger and not black, and so I decided on white for my car.  I realize that it's not always possible to get the color of car that you would most like, when purchasing used (sometimes also new).  But I cannot understand why anyone would deliberately purchase or alter the color of their car to black, outside of the precise desire to go unnoticed.

Although I do not have the statistics on the most preferred color in a Smart Fortwo.  I did notice that most of the cars on the lot where I bought mine were black.  Either that was because they were not preferred or because many people seek the color.  I've also noticed, back a few years when searching for a truck, that most of those on the market were also black.  These two observations have lead me to the idea that either black vehicles are unwanted or they are in high demand.  In either case they are still the most likely to be in a collision.

In the United States of America, as far as I know, there is no mandate on what color or size a production car must be or not be.  However, I so chose to make my small car as noticeable as I can, barring painting a sparkling, fluorescent share of pink. I realize that I have no control over the actions of others but I can at least drive Smart-ly and safely.