EV general discussion

The inverting aspect at lower currrent whilst keeping everything else live with hotel loads, ie pumps and fans etc. if you look at the states the 110v charging can be as low as 60%
 
I was thinking EV6. Damn that's a slab of a car with a massive battery. No way that's going to be as efficient as the other Kia range. I think you'd be better getting a proper charger for that beast.
 
Jonnycoupe said:
Granny charging is horrendously inefficient.
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7kw and 2.3kw are both AC charging at same voltage, will it not have the same inefficiencies?
Jonnycoupe said:
Kia’s are generally little cars hence efficicnt. Please don’t draw parallels in road load between a Kona and a bohemoth that is a EV9 just as they share a badge.
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Whilst that's a fair comment you can look at the smaller Volvos etc and see the trend that Volvo/Polestar tend to be behind the curve.
 
Bug One said:
You can use a big battery EV with mostly granny charging if your typical mileage is low.
It's what we're mostly doing with the Q8.

We only resort to using the 7kw OHME charger when back to back longer journeys are needed.
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I visited my folks a few weeks back and there is no charging near them. I granny charged in around 60kwh in just over 24hrs. I wouldn't choose to do it all the time personally but there was no drama.
 
Nah polestars are decent real world. Need to stop comparing tiny shopping car konas etc to actual performance cars.

The charger electronics are optimised around the peak current. Ie 32A on 7kW single phase so it’s just not as efficient with lower current trickling, a bit like an engine really, better volumetric effectively when it’s pumping the air its design to do. The switching IGBTs are turning 230V AC into the HV bus DC. So the have a upvoltage awell with the DCDC power electronics working outside their peak window.
 
sandys said:
7kw and 2.3kw are both AC charging at same voltage, will it not have the same inefficiencies?
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I think the logic is that, the slower you charge, the longer additional systems are active that have additional power draw. So, fans power management etc.

By charging faster you're wasting less energy. Once complete the car can go into a sleep state.
 
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Jonnycoupe said:
Nah polestars are decent real world. Need to stop comparing tiny shopping car konas etc to actual performance cars.

The charger electronics are optimised around the peak current. Ie 32A on 7kW single phase so it’s just not as efficient with lower current trickling, a bit like an engine really, better volumetric effectively when it’s pumping the air its design to do. The switching IGBTs are turning 230V AC into the HV bus DC. So the have a upvoltage awell with the DCDC power electronics working outside their peak window.
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E Niros are an odd car (iirc they share a lot of hardware with the Kona but don't quote me on that). they are not even a dedicated EV platform, and they are a decent (nissan QQ SUV) size and yet they can still get north of 4 miles/kWh which I think is impressive for such a decent sized car.
 
As does the EV6. South Korea drivetrains are very efficient for their specs.

With the Audi, I can see where all the energy is going. There's so much being wasted all the time. Even in eco mode it's just throwing energy at everything all the time.
 
I'd love to know, as I'm sure would VW Group. But, throw it does. Over a normal journey, being particularly conservative, 2.8 is the best I can achieve in it.

There's a lot of systems that are always active that must drain a fair amount. The ac/heating I suspect is very inefficient as is the drive. The pre-sense is always active and doing things.
 
Bug One said:
I'd love to know, as I'm sure would VW Group. But, throw it does. Over a normal journey, being particularly conservative, 2.8 is the best I can achieve in it.

There's a lot of systems that are always active that must drain a fair amount. The ac/heating I suspect is very inefficient as is the drive. The pre-sense is always active and doing things.
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2.8 the best? wow that is bad... I mean if I drive like a teenage chav I can get my ipace down to sub 2.0 but if I TRY to drive it well on eco I have seen rarely 4.0 or even 4.1.

my trip to my folks which bear in mind was mostly motorway , with the car set to max speed of 74mph my average was 3.3 per mile. not great by ENiro standards but not that bad either.
 
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Bug One said:
I'd love to know, as I'm sure would VW Group. But, throw it does. Over a normal journey, being particularly conservative, 2.8 is the best I can achieve in it.

There's a lot of systems that are always active that must drain a fair amount. The ac/heating I suspect is very inefficient as is the drive. The pre-sense is always active and doing things.
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A 10W system isn’t doing anything. Do you thing charging your phone also has an effect ??
 
bigmike20vt said:
2.8 the best? wow that is bad... I mean if I drive like a teenage chav I can get my ipace down to sub 2.0 but if I TRY to drive it well on eco I have seen rarely 4.0 or even 4.1.

my trip to my folks which bear in mind was mostly motorway , with the car set to max speed of 74mph my average was 3.3 per mile. not great by ENiro standards but not that bad either.
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Great by 400bhp performance car standard. E-Niro comparison is no longer legal on these forums :D :cry: Went to a nearish macdonalds with a mate tonight in my other car, b roads only, 8.8mpg. Next will be saying how crap it is cos there Audi estate gets 40mpg…
 
Bug One said:
No, but I suspect it's a multitude of lots of little things that on their own seem insignificant, but when combined adds up to a lot of wasted energy.
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As the car battery can power a house for a week or something. A few small things running is hardly going to "drain" the battery in a very short time.
 
Bug One said:
No, but I suspect it's a multitude of lots of little things that on their own seem insignificant, but when combined adds up to a lot of wasted energy.
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Like what exactly that’s unique to that car. Aircon is the significant one as I assume you aren’t using the heaters. But aircon is prob 80-1200W
 
Bug One said:
In you opinion. Different generations aspire to different brands.

You ask a 12 year old what car they want, i can assure you the name Tesla comes along the same level as Ferrari or Lamborghini.

They might be commodity cars to you, but that brand holds much more youth focus than most others.
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Not sure about that. Kids don't bat an eyelid at a Tesla, but they will run over to look at exotic stuff, including classics.
 
Large generalisation there. The only car I’ve had where a mate text back asking if he could pop over to show his 9 year old son was a Model S :o :cry:
 
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