EV (electric vehicle) News & Discussion

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#3297236 14-Oct-2024 14:38

trig42:

Was charging at 135kW. Gave me 12.8 kWh in that time. So, I think what I wrote is correct - If I'd left it there for an hour, and I had a battery big enough, I would have got 135kW in an hour so, 135kW per hour or 135kW/h.

Probably not. Not a lot of EVs that would be able to sustain 135 kW up to 100% SOC. (If any).

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Scott3

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#3297237 14-Oct-2024 14:43

richms:

Scott3:

kW is power at an instant

kWh is the total amount of energy.

kW/h is not really a thing. (technically it can be a ramp rate).

This is why I hate kilowatt hour as a unit of measure, could have used a joule based thing to measure powered stored in a battery. Too easy for people to mix the 2 up, particularly when saying a car was the 60 kilowatt model or something. That would be anemic if it was actually a 60 kilowatt car - morris minors would be on the same level of performance.

I kind of like it.

Hook your flat 64kWh car up to a 50 kW car charger, and it is going to take a bit over a hour to charge.

And if you are charging your 64kWh car at home on 20c / kWh electricity, it is going to slightly over $12

While Joule is the native SI unit for energy storage, quoting a 230 MJ battery doesn't really allow for any easy in your head math's.

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#3297238 14-Oct-2024 14:52

Handsomedan:

Stupid question time:
Company EV - home charger.

I am taking the EV on a road trip over Labour Weekend.
Will I need to take my bag 'o' cables with me to be able to charge at public charging stations, or are they like my home charger with a cab;e hardwired in?

For context - I have never charged my EV anywhere but home.

Cheers

HD

DC fast charges (anything 25kW and above) have a tethered cord.

Public AC chargers tend to require you to bring your own AC charging cord (type 2 to type 2, or type 2 to type 1 depending on your car).

If you want to charge off a wall outlet, you will need a portable charge cord with a brick in it.

So if you are happy charging on DC chargers only no cord required.

Best EV charger map is here:

https://www.plugshare.com/

Assuming your car has the below inlet, filter by CCS2 and you will only get the DC fast chargers. If you can favor charge stations with 2+ charger's, to reduce the odds of having to wait.

150A DC Electric Vehicle Type 2 CCS2 Socket EV Cable Plug To CCS Combo 2 Male Socket Fast Charging

A better route planner can be a good tool:

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Handsomedan:

OK - next stupid question - do I need to set up an account with anyone, or are they like a Gas station, where I can just pay via card at the "pump"?

This is quite a pain point. Every charge provider has their own app to activate the chargers.

Many will also mail out fobs so you can use that to start / stop charging instead of you phone.

Look into your route and see what brand of chargers you are likely to use and then download their app.

Jase2985

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#3297239 14-Oct-2024 14:52

trig42:

Jase2985:

@trig42:

came back out and checked my messages. 5 minutes charge ~135kW/h into my MG4, ~90km range added for ~$10. So easy. Nice place to stop and well laid out.

did you miss a decimal point in there? Your car neither has that big a battery nor are there chargers that can deliver that much juice that quickly.

Was charging at 135kW. Gave me 12.8 kWh in that time. So, I think what I wrote is correct - If I'd left it there for an hour, and I had a battery big enough, I would have got 135kW in an hour so, 135kW per hour or 135kW/h.

no, you said "~135kW/h into my MG4", when you should have said it was charging at 135kW, the instantaneous measure of power or the max instantaneous measure of power. You only put 12.8kW/h into your vehicle. You would never have got 135kW/h into your vehicle, 1, the battery isnt that big, and 2, the vehicle slows down massively after 70-80%.

HarmLessSolutions

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#3297242 14-Oct-2024 15:00

SaltyNZ:

richms:

No idea on that. It is just a plug so they could extend the standard to support it easily enough. I am not that concerned with V2G, however V2L would be nice to have in a car.

Yeah V2L is like having a generator with you wherever. Been really handy in the MG during one long power outage. If they offered a reasonably priced retrofit to the 3 then I'd consider getting it in that too.

Our next EV will be one that offers V2G as we've opted not to install home battery storage with this in mind (if our Leaf doesn't fill that purpose in the meantime). V2L is fine if you just want to run an extension lead for an appliance or two but V2G gives you far more opportunity to use your EV as a storage place for solar (or cheap offpeak) supplied electricity which can then be either consumed or onsold as the situation presents itself.

https://www.harmlesssolutions.co.nz/

SaltyNZ

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#3297244 14-Oct-2024 15:02

Jase2985:

no, you said "~135kW/h into my MG4", when you should have said it was charging at 135kW, the instantaneous measure of power or the max instantaneous measure of power. You only put 12.8kW/h into your vehicle. You would never have got 135kW/h into your vehicle, 1, the battery isnt that big, and 2, the vehicle slows down massively after 70-80%.

@trig42 has fallen victim to one of the classic blunders. The first two of which, of course, are 'never get involved in a land war in Asia' and 'never go up against a Sicilian when death is on the line.'

The last one is obviously 'never mix up kW and kW/h on a forum thread for EV enthusiasts.'

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SaltyNZ

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#3297246 14-Oct-2024 15:07

HarmLessSolutions:

Our next EV will be one that offers V2G as we've opted not to install home battery storage with this in mind (if our Leaf doesn't fill that purpose in the meantime). V2L is fine if you just want to run an extension lead for an appliance or two but V2G gives you far more opportunity to use your EV as a storage place for solar (or cheap offpeak) supplied electricity which can then be either consumed or onsold as the situation presents itself.

I did think about that but as an ex Leaf owner I am not thrilled at the prospect of using up my precious battery charge/discharge cycles to sell electricity to the grid at way less than it will cost me to replace a worn-out battery.

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Ge0rge

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#3297248 14-Oct-2024 15:11

I liken it to extending the vehicle's useful life. Once the battery capacity has decreased to below acceptable range, park the vehicle and plug it in to the house as a battery. Once it has decreased below usefulness for that, off to the wreckers.

HarmLessSolutions

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#3297249 14-Oct-2024 15:11

SaltyNZ:

HarmLessSolutions:

Our next EV will be one that offers V2G as we've opted not to install home battery storage with this in mind (if our Leaf doesn't fill that purpose in the meantime). V2L is fine if you just want to run an extension lead for an appliance or two but V2G gives you far more opportunity to use your EV as a storage place for solar (or cheap offpeak) supplied electricity which can then be either consumed or onsold as the situation presents itself.

I did think about that but as an ex Leaf owner I am not thrilled at the prospect of using up my precious battery charge/discharge cycles to sell electricity to the grid at way less than it will cost me to replace a worn-out battery.

More gain to be had than loss suffered. Check out this info based on Fermata Energy's efforts in North America.

https://www.harmlesssolutions.co.nz/

Shadowfoot

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#3297259 14-Oct-2024 15:29

Scott3:
trig42:

Jase2985:

did you miss a decimal point in there? Your car neither has that big a battery nor are there chargers that can deliver that much juice that quickly.

Was charging at 135kW. Gave me 12.8 kWh in that time. So, I think what I wrote is correct - If I'd left it there for an hour, and I had a battery big enough, I would have got 135kW in an hour so, 135kW per hour or 135kW/h.

kW is power at an instant

kWh is the total amount of energy.

kW/h is not really a thing. (technically it can be a ramp rate).

I would have got 135kWh in an hour so, 135kWh per hour or 135kWh/h = 135kW

486Mj in an hour if I’ve done the conversion correctly, and 46.08Mj for the time connected.

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#3300198 23-Oct-2024 09:15

trig42:
Stopped at the BP in Tirau. 10 Charging bays. Connected up, went inside and bought an Ice Cream, came back out and checked my messages. 5 minutes charge ~135kW/h into my MG4, ~90km range added for ~$10. So easy. Nice place to stop and well laid out.

Did you figure the $5 ice cream into your charging costs? 😂

deepred

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#3300521 23-Oct-2024 15:09

Watch: MG hatchback falls short of top crash-test rating

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#3300584 23-Oct-2024 15:47

deepred:

Watch: MG hatchback falls short of top crash-test rating

That MG 3 is not an ev though, so not sure what your point is?

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#3300740 23-Oct-2024 22:08

A bit of a random question. If a family has two cars - a larger one (SUV, station wagon, etc.) and a small hatchback; which one does it make more sense to replace with an EV, assuming both ICE cars are currently being similarly used and getting similar weekly mileage?

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#3300749 23-Oct-2024 22:39

Kookoo:

A bit of a random question. If a family has two cars - a larger one (SUV, station wagon, etc.) and a small hatchback; which one does it make more sense to replace with an EV, assuming both ICE cars are currently being similarly used and getting similar weekly mileage?

I'd say whichever uses the most fuel.

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