Tag: Range

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Is a Tesla more efficient in Summer? Yes but it’s a two edged sword.

The climate in the southern half of Western Australia is near perfect for a Tesla, warm and dry most of the time and winters where the temperature only drops below 5C for a few hours on the occasionally early morning, if you enjoy getting good Wh/km efficiency WA is the place to achieve it.

On the downside is the long hot summer of constant intense sunlight and high temperatures, this doesn’t generally harm the Wh/km figures recorded during longer drives but does put a serious dent in efficiency for those driving short (less than 15km) trips after being parked in an exposed area for even a short period during the day. Every time you drive off in a car with a hot interior the aircon is working hard to reduce the temperature, depending on conditions that could take anything from 10 to 30kms.

Teslas have an excellent feature known as cabin overheat protection, even on a 30C day this will consume up to 4% of the battery over 9 hours, personally I’ll happily accept a 4% loss each day over Summer but anyone who is not is free to turn cabin overheat protection off. Of course if car park designers who have a fetish for destroying trees allocated funds for solar panel canopies car parks wouldn’t be so hot.

So are all these hot Summer days killing your range?
Not really, it’s consuming far more energy between each charge but as this is caused by short drives and long parking sessions it’s not relevant unless you’re buying expensive electricity. Range is only a factor on very long drives away from reliable fast charging. When you go on a long drive the heat will have little effect on your Wh/km efficiency (it helps if you pre-cool the interior while plugged into shore power before departure).

Hot tips for a cool interior
Try to park in the shade even if it’s a 200 metre walk to your destination.
Get interior shades up, especially over the black dashboard.
Pre-cool the interior using the phone app about 5 minutes before arriving at your car.
If only parking for 45 minutes or less put the car in “keep” mode, this leaves the air-conditioner on and does not use any more energy than letting the car heat up then cooling it down again.

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Why 450 km of EV Range is Enough in Australia

Many of you will have seen the social media commentators claiming how much range an electric vehicle needs, it normally goes like this: “I’m all for electric vehicles and keen to buy one but unless it has X amount of range I’ll stick with my trusty diesel”. As each year passes and the range of showroom EVs increase the commentators X number also increases. This is Uncertainty 101 from those with the most to lose when the country transitions to electric drivetrains, it’s a very effective manipulation of all the fence sitters that are close to making a new car purchase.

To make this very clear when I say 450km of range I’m referring to passenger vehicles, not commercial vehicles such as heavy duty four wheel drives that were purchased with the sole purpose of towing a caravan or large trailer over long distances.  I’ll also make it very clear that 450kms is real range on coarse surface country roads sitting on 100km/h, this is where the range is needed most. Anyone buying a vehicle that never leaves the Melbourne to Cairns coastal corridor could easily survive on 350km of real range.

There’s no doubt that battery costs per kWh and energy density will improve sufficiently to make the fitting of large battery capacities fairly easy for vehicle makers That’s great for commercial vehicles but a waste of resources for the average Joe who for the vast majority of the year drives less than 200km per day and makes 2 to 3 long trips of maybe 2,000km,  having a battery pack 20kWh or even 30kWh bigger than necessary is careless, multiply that by millions of average Joes across Australia and it’s a significant drain on materials, labour and energy that could be better used elsewhere.

So how does 450km of range deal with the vast distances of Australia? That’s a fair question and the answer is straight forward, carefully placed DC fast chargers are a far better use of materials, labour and finances than millions of EVs full of oversized battery packs. The careful placement part is critical, between the capital cities and larger towns 220km average spacings are suitable, for regional areas in north, west and central Australia there’s far less choice of suitable sites so a 300km spacing may have to suffice. A reasonably organized driver should have no issue stopping every 300km to add around 65% charge on a long country trip.

The author currently drives an electric vehicle with 400km of real range on Australian outback roads, and has been to every State and Territory over the past 6 years. His last vehicle was a diesel 4WD with 1,100 km range, it is not missed.