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21 March 2018

EV 101

As an advocate for Green cars, I found this article to be very informative as many progress to electric cars. As well, my late parents were automotive historians and have a hand-written automotive chart going back 100+ years showing EV’s were the preferred choice over load, smelly fossil fuels! This story is entitled, “How Charging an Electric Car is Completely Different to Refuelling a Petrol or Diesel Car” by Dr. Trevor Larkum.
“Having driven only electric for four years I’m going to try to explain what charging an electric car is like. This is for everyone who’s just bought or is considering buying their first electric car. One thing I’d like to convey is that charging an electric car is much easier and more convenient than filling a fossil-fuelled car. That’s an idea that can be difficult to grasp. Having upgraded to electric (I’m on my second all-electric car) I could never go back, any more than I’d give up my smartphone and make do with a landline.
Here I’ll concentrate on the ins and outs of home refuelling, and cover charging away from home another time.”
Charging System:
Most electric cars come with a charging cable (fitted with a 13 Amp plug) that can be used to charge the car; such cables can be bought separately where they are not supplied with the car. One name given to these items is ‘granny cable’ as they can also be used to charge up while visiting relatives.
Another name they are given is ‘occasional use cable’ as they are not intended to be used frequently. They will also be slow to charge the car (12 hours or more) as a standard home socket is not capable of providing as much power as the car can potentially take. Instead most car owners will have a special charge point installed at home to charge their car. This often comes free with a new car. It is typically wired straight into the main house consumer unit. It will be capable of passing higher power than a standard socket – usually either 16 or 32 Amps – and will be designed for frequent use. These charge points can be installed either inside a garage, or on a garage or other outside wall. Sometimes they’re just put on a post beside the driveway. They are all waterproofed and can be used in all weathers (including heavy rain). They usually come fitted with a tethered cable to match the car but sometimes just have a socket to which the owner can connect different cables, for example if the unit has to charge electric cars with different types of connector. The pros and cons of having a tethered versus untethered charge point are covered elsewhere.
How Often Do You Charge?
How often does an electric car need to be charged? This is an important question, and is key to why charging is more convenient than conventional re-fuelling. The obvious answer, at least to someone used to a conventional car, would be “when it’s empty”. That’s because most people let their cars run low on fuel before refilling. There is no good reason for this; it simply reflects the fact that conventional refuelling is so inconvenient that it is to be avoided whenever possible. It takes time, and usually also involves a diversion from where you actually want to go. With an electric car you could choose to do the same thing, relying on public charge points, and that can work if you can’t do home charging. However for the majority of electric car owners with a home charge point the easiest thing is simply to charge at home overnight every night.
Electric cars use Lithium-Ion batteries, similar to those found in mobile phones (though they have significantly more sophisticated charge management systems than phones and so last longer). Lithium-Ion likes to be kept charged unlike previous technologies (e.g. Nickel-Cadmium batteries) that you were supposed to run down before recharging. Therefore it does no harm to plug in every night and so have the car battery fully charged every morning ready to go. Using a dedicated high power charge point allows a typical electric car to be charged in about 4 hours. It’s also fine to only partly refill it. Therefore it can be perfectly practical to drive, say 100 miles during the day for work, then go home and – those evenings when it’s useful – top it up for an hour or two and go out again for, say, another 50 miles.
How To Charge:
It’s very easy to charge an electric car once you have a dedicated charge point. If you are lazy, like me, then you have a tethered one with its cable permanently attached so you don’t have to unpack a cable each time. Similarly, I choose to leave mine switched on permanently for convenience.
In this case, charging is as simple as the following:
Open the charge point door on the car. Uncurl just enough of the charge cable to insert its connector into the car’s charge socket. The car will automatically start to charge when it sees the electrical connection made. It will control the charge and finish it automatically. On my original Renault ZOE the charge point door was unlocked using a button on the key fob or a switch inside the car. The charge socket was in the nose and so required walking around to it to insert the connector. The total time taken was about 15 seconds; this would also be typical for the Nissan Leaf. On my current BMW i3 the charge point door is always unlocked if the car is unlocked, and the charge socket is on the driver’s side. Therefore I can insert the connector after I have parked the car and as I walk out of the garage; there is literally no additional time taken to set the car for charging. The Hyundai IONIQ Electric also has the socket on the rear quarter, though on the passenger side.
People sometimes ask me how long it takes to charge my car. They probably expect to hear me say ‘4 hours’ or whatever, but actually it takes me personally no time at all, not a single minute. That’s because I don’t care how long it takes for the battery to fill up while I’m in the house (and probably asleep).
With my i3 having a range of about 120 miles, and my commute being 45 miles, it’s not even a problem if I forget to charge for a day or two. However, like with your smartphone, making charging it a daily routine is generally the best option.
One of the great things I love about a car that’s electric is no longer having to spend time fuelling it. It’s just 100% full every morning when I get in, as if by magic. I certainly don’t miss having to travel to petrol stations, often standing in the dark and rain, to hand over large amounts of money. Thanks Doc and more on EV’s coming up!

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