EV general discussion

sandys said:
On a PHEV everything like that runs off the DC HV battery, like an EV, so of course it drains that, then the AC hookup tries to charge the battery after a few percent is used. No car stuff can run off AC house supply.

The high draw for AC is just the initial though and it'll scale back and tick over at a low consumption rate generally.
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I know it doesn't run directly from the house supply to the air con, and drains the battery first...my point was that I didn't expect the house to not be able to keep up with that drain and replenish the battery. I know air con is thirsty, it just surprised me that's all. Apparently not a problem with a proper wall charger though. Either way I guess it will still deplete the battery less than not being plugged in, so I'll keep doing it to maximise the range when I leave the house.

Perhaps I should experiment and remote start the climate earlier...maybe tomorrow I'll check and see if that's enough time for the initial drain to slow as the cabin cools, and then the house replenish the battery fully before I get in.
 
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Aircon is a heat pump…

Batteries don’t need cooling any more than normal in this weather when just sitting on a motorway. And it’s just a water pump anyway

Can we call energy consumption what it is. Rather than a ‘drain’ too please in the interests of correct posts.
 
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I don't think the AC power usage is that bad once it's going. I see an average of around 1-1.2 kW at 21C target in the car in this weather, even with the glass roof.

With the AC on I'm usually still over 4 mi/kWh in this weather, even when including some motorway usage.
 
Simon said:
Aircon is a heat pump…

Batteries don’t need cooling any more than normal in this weather when just sitting on a motorway. And it’s just a water pump anyway

Can we call energy consumption what it is. Rather than a ‘drain’ too please in the interests of correct posts.
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I understand how air con works but not all ev's have a heat pump yet have air con, but both systems can perform the same function.
www.kia.com

What Is a Heat Pump & How Do They Work?

Learn how heat pumps in electric cars save energy, extend range and keep your cabin comfortable in all weather conditions.
www.kia.com www.kia.com

Most manufacturers do say that the batteries also need cooling https://www.volkswagen.co.uk/en/ele...ng-the-battery-of-your-electric-car-cool.html
Thus are heat pumps more efficient at cooling the batteries than conventional systems or, for cooling, is it the same?
 
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I’m getting 4.3m/kwh on a 250 mile trip on the motorway in this weather. But I don’t generally have the AC ice cold. It sits at 21c.

Range is a consistent 290 if I run it from full to 10%. I’m happy as Larry with that tbh. Cars just ticked over to 20k since October, and I’ve had 2 bad charging experiences.
 
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cuke2u said:
I understand how air con works but not all ev's have a heat pump yet have air con, but both systems can perform the same function.
www.kia.com

What Is a Heat Pump & How Do They Work?

Learn how heat pumps in electric cars save energy, extend range and keep your cabin comfortable in all weather conditions.
www.kia.com www.kia.com

Most manufacturers do say that the batteries also need cooling https://www.volkswagen.co.uk/en/ele...ng-the-battery-of-your-electric-car-cool.html
Thus are heat pumps more efficient at cooling the batteries than conventional systems or, for cooling, is it the same?
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True aircon is a heat pump in reverse.

Water glycol cools the battery and runs on a small pump
 
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sandys said:
On a PHEV everything like that runs off the DC HV battery, like an EV, so of course it drains that, then the AC hookup tries to charge the battery after a few percent is used. No car stuff can run off AC house supply.

The high draw for AC is just the initial though and it'll scale back and tick over at a low consumption rate generally.
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7kW off house AC can easiest run remote climate at max cabin pull down load…
 
All air conditioning systems are a heat pumps.

The difference is really just how they have deployed it and if it’s reverse cycle or not. Reverse cycle means it can both heat and cooling and is more complex. If it’s not reverse cycle it can heat or cooling only but not both.

In car world, they often describe it as a heat pump if it’s reverse cycle meaning it can heat and cool both the cabin and the battery.

Cars not fitted with a heat pump still have one but it’s cooling only and they use a direct electric heater for heating. Cheaper to deploy but lower efficiency.
 
b0rn2sk8 said:
All air conditioning systems are a heat pumps.

The difference is really just how they have deployed it and if it’s reverse cycle or not. Reverse cycle means it can both heat and cooling and is more complex. If it’s not reverse cycle it can heat or cooling only but not both.

In car world, they often describe it as a heat pump if it’s reverse cycle meaning it can heat and cool both the cabin and the battery.

Cars not fitted with a heat pump still have one but it’s cooling only and they use a direct electric heater for heating. Cheaper to deploy but lower efficiency.
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Gotcha, thanks for the explanation..
 
with the glass roof on the tesla do these use more energy than most to keep the cabin cool.

( current summer heat - seems short sighted that UK housing heat pumps aren't reversible & ducted air )
 
Simon said:
Yeah. Also available on Google before calling out people as being wrong
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I wasn't, this is my first ev so I'm just wanting to learn from others and clarification. If I thought anyone was wrong then I don't have any issue with saying so, hence the sedan debate.
You do rather jump to conclusions :rolleyes:
 
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tamzzy said:
is the highland model 3 refresh worth the premium over the 2021-2023 model 3?
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The question isn’t really ‘is the refresh worth the extra’, it’s ’am I happy to be paying more depreciation for a newer car’.

The refresh is objectively better in every way, except it doesn’t have indicator stalks. This is 100% a dealbreaker for some people.

It would 100% annoy Mrs Sk8, although I am sure she we get used to it in time, she would just deem it completely unnecessary ‘innovation’ and she doesn’t have time for that kind of nonsense.
 
cuke2u said:
I wasn't, this is my first ev so I'm just wanting to learn from others and clarification. If I thought anyone was wrong then I don't have any issue with saying so, hence the sedan debate.
You do rather jump to conclusions :rolleyes:
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Ah grudges. Nice

Act thick. Call out correction then call the innocent card
 
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jpaul said:
with the glass roof on the tesla do these use more energy than most to keep the cabin cool.
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It’s irrelevant in the grand scheme of things. You’ve got a motor which can pull hundreds of kw when you mash the go pedal and you are worried about the power draw of a heat pump which will be drawing hundreds of watts on tickover.

P.S. A glass roof isn’t a Tesla only feature, they are tinted and usually have UV reflective to reduce solar gain…


jpaul said:
( current summer heat - seems short sighted that UK housing heat pumps aren't reversible & ducted air )
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The purpose of the grant is to move people to energy saving and carbon reducing methods of heating your home.

Enabling (and subsidising already wealthy) people to burn (literally via a gas power stations) energy cooling their homes which increases emissions seems counter productive.
 
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