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How Long Does It Take To Charge An EV?

I guess we’ve all noticed by now that EVs (either hybrids or full-time electric vehicles) are getting common on the roads.  Maybe you’re considering getting one for your next car.  Charging stations for EVs are popping up left, right and centre.  This is because the battery in an EV, just like the battery in any other device powered by electricity, needs to be recharged.  It’s kind of like charging your phone or your laptop.

Most, if not all, of us have had some experience with charging up things with batteries and know that it can take some time.  This raises a rather important question about EVs: how long does it take to charge one?  We’ve mostly become familiar with how to fuel up an internal combustion engine (ICE) car: you pull up to the bowser, you open the fuel cap, you fill up with the liquid fuel of your choice, then you nip in and pay for it, possibly picking up a packet of peanuts or a coffee while you’re at it.  It doesn’t take too long – maybe 10 mins max, depending on how long the queue at the checkout is, how big your fuel tank is and how empty it was when you started.  But what about an EV?  There’s nothing physical going into the tank and we all know that it can take a while for a battery to recharge (I usually give my rechargeable AA batteries about 4 hours, the laptop takes 2 hours and the amount of time for the phone varies depending on who else needs the charger and whether I need the phone!).

The good news is that on average, it takes 20–30 mins to get to 80% when charging an EV, especially if you’re using one of the public charge points around town.  This means that most of us might have to plan a charging session into our days – during lunchtime, maybe, or while picking up groceries.

There’s a certain strategy to ensuring that your EV has the charge it needs to keep ticking on around town.  I’m assuming here that you are based in the city and do most of your driving in the city.  If you’re in a rural area and do a lot of open road running, things will be a bit different and given the range of what’s currently on the EV market, you might either consider sticking with an ICE vehicle or at least a hybrid, or you’ll have to try another strategy.  Anyway, for the typical suburban driver, the best strategy is to use the public charging points around town for top-up charging, and you do the full charge to 100% overnight at home if possible.

The reason why it might not be best to try charging your EV to 100% charge at one of the public points is because charging an EV isn’t like filling up a petrol or diesel vehicle. With the ICE, you pump in the fuel at a steady constant rate and if you graphed it, it would make a straight line – as long as your grip on the pump is nice and steady.  However, the graph for charging time is more like one of those curved lines related to quadratic equations – you know, the ones we all struggled through at high school and couldn’t see the point of.  Charging starts with a hiss and a roar and you can get to 80% charge pretty quickly.  It’s the final 20% needed to get to full charge that seems to take forever.  It’s more like pumping iron at the gym than pumping gas – you do the first round of sets and reps quickly, but those last few when you’re getting tired tend to be a bit slower.  This is why charging to 100% is best left for overnight charging sessions at home.

The good news about overnight charging is that night rates for electricity are often lower than daytime rates.  This is because all the commercial users of electricity – factories, shops, heavy industry – don’t put as much demand on the power grid outside working hours, so there is plenty of power for everybody else.  Whether this will remain the case when EVs are adopted more widely is uncertain – let’s hope that lower overnight rates remain a thing.

Of course, the exact time of charging will depend on the individual EV and it also depends on the type of charger that you’re connecting your car up to.  Chargers come in three types: Level 1, Level 2 and Level 3.  Levels 1 and 2 use AC current but Level 3 uses DC current.  Level 3 DC chargers generally are only compatible with Tesla models, which is ironic, given that Nikola Tesla specialised in AC current.  Level 1 chargers just plug into a typical 10-V socket and are best kept for emergency top-ups, as they charge pretty slowly.  What you will generally come across both at home (if you install one) or around town are Level 2 chargers.  Level 2 chargers have a charging rate of 15–100 km/hr, meaning that in one hour they give your vehicle enough charge to take it 15–100 km.  The low-power Level 2s installed at home tend to be towards the 15 km/hr end and the public ones are at the other end.

The different levels are not the same as the plug types, which are known as (predictably) Types.  There are four types: Type 1 (J1772), Type 2 (Mennekes), Type 3 (Scame) and Type 4 (CHAdeMO).  Tesla, being a posh marque, has its very own type of charging plug, rather like Apple, although it’s based on the Type 2 Mennekes.  Type 3 is also pretty rare in Australia.  There’s also a combo plug (known as a Combined Charge System or CCS) that combines either the Type 1 or Type 2 (it varies depending on the marque) with a pair of DC connectors.  Charging stations generally have CHAdeMO and CCS to make thing simpler.  The different plug types are quite a lot to wrap your head, so I might have to explain all this in another post.

Anyway, in a nutshell, here’s the basics you need to know:

  • The average time needed to charge to 80% is half an hour although this depends on the level of charger.
  • Charge time isn’t linear – the first 80% is fairly quick but the final 20% is slower.
  • Full charging to 100% is best done at home overnight.
  • Around-town chargers are best kept for topping up to 80%
  • Slower chargers (Level 1 and Level 2) use AC current but the fast ones use DC.
  • Nikola Tesla, who was the pioneer of AC electricity, would be spitting mad that the cars with his name use DC current. Just as well he never got around to inventing that death ray…



One comment

  1. Jerry Dolan says:

    I feel that your spiel is misleading all you discuss is one type recently I was in California where the predominant EV was hydrogen powered. Fill up was about three minutes with a range of about 300 miles of the normal Cal. driving the only emission was water.. The Tesla battery I feel is not the way to go with a questionable life and difficult disposal and the range is not particularly great.
    Thinking about it hydrogen and fuel cells seems to be the logical way to go

    September 3rd, 2018 at 2:37 pm