[CarCanvas]

Originally Posted by ram7077

I was driving very slow yesterday after charging my car. I can show you my smart drive details as well. When I slowed down, this happened. This happens twice and that too only when i slow down my car.

Hmmm, seems that there is a issue at the time of regeneration. Is this still happening or it stopped? Better get the car checked at service center.

[ram7077]

Originally Posted by CarCanvas

Hmmm, seems that there is a issue at the time of regeneration. Is this still happening or it stopped? Better get the car checked at service center.

I turned off the car using the emergency off button below the steering and since then, the issue seems to be resolved. Tomorrow I have my 5000 kms service scheduled and I will ask them about this issue.

Other than that I have some queries. Will the battery overheat due to current fluctuations? Will the battery overheat, soon after you drive after charging ?

[Turbanator]

75kmph= 7000 RPM= warning.

Doesn’t sound right. Hope it’s not a copy paste from any ICE manual

If we are aware of the wheel dia, and the gear ratio, it’s possible to get RPM of motor. Irrespective of the calculations or warning, I don’t think any car is designed to run at 80-100 kmph. Most EVs should be ok for constant running at 140-160 kmph in my opinion.

The reasons of the error here can be most likely attributed to charging glitch (maybe high ambient temperature) or a software error. Can’t be due to motor overheating unless there’s a fault in it. Do update what service centre find something.

[shubhank008]

Originally Posted by Shreyans_Jain

Interesting, for Tata EVs do not have any such warnings or disclaimers. Points to hidden cost cutting on part of MG, which the customer is then left to endure.

I have driven my Nexon EV at a sustained 120kmph for hours in 45 degree summer heat, with a DC fast charging session in between. Car didn’t throw any errors or warnings.

How does 7000rpm translate to 75kmph? Can you share any snippet?

I am about to hit 8k drive mark, November 2024 purchase.
And have done 4 road trips during which I have continuously driven at 90-100 (even 110 at times) for 3-4 hours, with a couple seconds slowdown as needed.

Didn't face any such issue so don't think this should be it.
And we just returned from Chandigarh to Delhi yesterday, during noon so it was decently hot (yeah yeah its not delhi hot yet).

PS: One thing I will mention though is, all 3 x JioBP/Statiq chargers we stopped at were 60KW, yet all of them were charging at 25KW.
And it was not just us, a BYD Seal owner also confirmed he stopped at 2 chargers from Chandigarh to Karnal and all of them were doing 20-25KW as well.

Kinda bummer that 60KW chargers doing less than half yet not showing on app about it, this kind of screwed our trip time we had planned and made us do more sub-stops (instead of charging 80% at one stop)

Originally Posted by ram7077

Other than that I have some queries. Will the battery overheat due to current fluctuations? Will the battery overheat, soon after you drive after charging ?

Shouldn't be so either, if you notice, right after you stop charging, the charger gun takes couple of seconds (I dunno 30 ?), before you can plug it out. It won't let you plug out as soon as you hit stop, I think thats to let the gun proper discharger/cool-down, the same should be with battery too.

[Reza890]

Originally Posted by shubhank008

I am about to hit 8k drive mark, November 2024 purchase.
And have done 4 road trips during which I have continuously driven at 90-100 (even 110 at times) for 3-4 hours, with a couple seconds slowdown as needed.

Didn't face any such issue so don't think this should be it.
And we just returned from Chandigarh to Delhi yesterday, during noon so it was decently hot (yeah yeah its not delhi hot yet).

Yes, since the past 3 weeks, all the Jio Bp and chargezone chargers in Mumbai are giving me max output of 30kwh. Infact even a 150 kwh charger was giving me 30 kwh output to me and a xev owner. Not sure whats caused them to limit the speed

[guptad42]

Originally Posted by shubhank008

...
PS: One thing I will mention though is, all 3 x JioBP/Statiq chargers we stopped at were 60KW, yet all of them were charging at 25KW.
And it was not just us, a BYD Seal owner also confirmed he stopped at 2 chargers from Chandigarh to Karnal and all of them were doing 20-25KW as well.

Kinda bummer that 60KW chargers doing less than half yet not showing on app about it, this kind of screwed our trip time we had planned and made us do more sub-stops (instead of charging 80% at one stop)
...

It is time to update the public charger policy to specify 150KW sustained output at 50C ambient as the default min DC fast charger, and the EVs qualifying for incentives can have the peak charging speed spec. So that the power infrastructure and DC charger design and cooling are ready. The investment being made in 25-80KW 'fast' chargers will turn out to be a waste. Most of it will not recover investment while the EV penetration is low, and these will be useless due to long charging times/long queues forming at highway stops as number of EVs pick up.

A 150KW charger lets you charge 2 cars at 75KW each,
or 1 car at full 150KW at least for the first 30-50% of the SOC.

[Jazzybala]

Originally Posted by guptad42

A 150KW charger lets you charge 2 cars at 75KW each,
or 1 car at full 150KW at least for the first 30-50% of the SOC.

The charging speed is very much battery dependent. Unless the battery is designed to handle high speed charging(>1.5C), it doesn't matter what the input power capacity.

For eg, Nexon LR had a battery capacity of 40.5kWh but the battery is designed for 0.7C so it can only do about 28KW max whole, irrespective of the input power given. While the Nexon 45 can do 1.2C charging so even with 45kWh battery it can charge at almost 60KW.

For over 90% cases, we need these 60-80kw chargers with 3-4 guns each to proliferate in very large numbers with the large 120-240kw chargers at places that see high volume flow so that demand is dispersed as much as possible instead of being concentrated in a few centers.

[guptad42]

Originally Posted by Jazzybala

The charging speed is very much battery dependent. Unless the battery is designed to handle high speed charging(>1.5C), it doesn't matter what the input power capacity.

For eg, Nexon LR had a battery capacity of 40.5kWh but the battery is designed for 0.7C so it can only do about 28KW max whole, irrespective of the input power given. While the Nexon 45 can do 1.2C charging so even with 45kWh battery it can charge at almost 60KW.

For over 90% cases, we need these 60-80kw chargers with 3-4 guns each to proliferate in very large numbers with the large 120-240kw chargers at places that see high volume flow so that demand is dispersed as much as possible instead of being concentrated in a few centers.

A 60KW charger with 4 guns active will be just 15KW per car. That's painfully slow on a highway stop/ high volume charging locations. Less than 4KWH delivered in 15 mins.

I completely agree that only the charger spec is not enough. Which is why I suggested the EVs qualifying for incentives have the same charging speed spec. It is not difficult. It is one-time work to design the battery arrangement, motor and power electronics for a higher voltage if the Indian carmakers were doing it themselves. In reality, as the rest of the world's 2025 EV models already have reached ~150KW charging speed, the Indian EV makers will simply pick existing designs from component suppliers.

See, the EV enthusiasts and early adopters are willing to do things like advance planning, social media checks for which chargers are good, and long stops for highway charging. Most of the Indian car buying public will not put up with it. So, if we want faster EV adption, we need much better charging experience on the road, with every charger on every app/ in-car dashboard, current charger status for selected charging site, 15 min charging times, easy payments. Premium per minute rates for charging beyond 80% to reduce chances of charge ports being blocked unnecessarily.

The real value of a 150KW DC charger is that it can deliver 37.5KWh in 15 minutes = 280 km of range added (at ~7.5km/KWh), of course only if the battery allows it. 7KW slow AC charging can happen at home/ office/ shopping centers/ hotels etc. and will suffice for >90% of charging needs.

[DriveDynasty]

Originally Posted by Ashwathama

I charged my Windsor to 100% last night. After charging, when I turned on the vehicle for a ride, it started making a loud humming and whirring noise from the bottom grill in the front. I got so scared and felt the car might blow up. Is this normal? Has this happened to any other Windsor owner or EV owner? Is the car trying to cool the battery, or is there some fault somewhere? Because this has never happened before. I also have a video of the noise, but I don't know how to post a video on the forum.

Happened to me today for the first time. Noise was coming from the AC and it was weird, loud. like AC compressor griding with something. I was coming back from office, the moment I sat in the car and started driving noise became apparent. On route whenever I turned off the AC (keeping fan on) noise vanished completely and immediately, but it started coming again as soon as I started AC. This lasted for about 30-40 mins and then there was no noise even when AC was ON.

Never had such experience with any other car..!! Glad this happened when my friends / cousins were not around, as many of them have started calling this car as 'china maal'..!!

By the way, I did not receive SOH in the second service. I had received it on first service without asking. Can people share their first and second service battery health? (SOH) ?

[Ashwathama]

Originally Posted by DriveDynasty

Happened to me today for the first time. Noise was coming from the AC and it was weird, loud. like AC compressor griding with something. I was coming back from office, the moment I sat in the car and started driving noise became apparent. On route whenever I turned off the AC (keeping fan on) noise vanished completely and immediately, but it started coming again as soon as I started AC. This lasted for about 30-40 mins and then there was no noise even when AC was ON.

It's just the fan trying to cool the battery. It's a good thing actually.

[shankar.balan]

Originally Posted by guptad42

It is time to update the public charger policy to specify 150KW sustained output at 50C ambient as the default min DC fast charger,nd these will be useless due to long charging times/long queues forming at highway stops as number of EVs pick up.

A 150KW charger lets you charge 2 cars at 75KW each,
or 1 car at full 150KW at least for the first 30-50% of the SOC.

I agree this would be an ideal scenario.

However, just like how internet bandwidth does get choked when more and more users are online simultaneously and concurrently, the exact same thing will happen to the electricity grid, when greater penetration and adoption of EV’s occurs, because of the use by simultaneous, concurrent users across the country.

This is a topic which has been discussed before on some old thread pertaining to EV’s and their load on the grid.

Therefore, we really need to harness the sun and water and wind in order to generate adequate power. Nuclear would be good too if we can manage it.
But thermal power is not a good dependency for us to have, from a long term point of view.

[DriveDynasty]

Originally Posted by Ashwathama

It's just the fan trying to cool the battery. It's a good thing actually.

Then noise should continue even if we turn off the AC right? I dont think this is battery related, I think it was coming from AC compressor atleast in my case.

[guptad42]

Originally Posted by shankar.balan

I agree this would be an ideal scenario.

However, just like how internet bandwidth does get choked when more and more users are online simultaneously and concurrently, the exact same thing will happen to the electricity grid, when greater penetration and adoption of EV’s occurs, because of the use by simultaneous, concurrent users across the country.

This is a topic which has been discussed before on some old thread pertaining to EV’s and their load on the grid.

Therefore, we really need to harness the sun and water and wind in order to generate adequate power. Nuclear would be good too if we can manage it.
But thermal power is not a good dependency for us to have, from a long term point of view.

I agree. This is the reason I support policies that:
1. Impose a rising cost/tax on ICE cars instead of banning the sale outright. The money can fund grid capacity and energy storage investments.
2. actively promote bidirectional 7KW chargers as standard, and time of day tariffs. Power is cheap to free during solar peaks in the day/afternoon and EV batteries can soak it up, and incentives to give some of it back to the grid to stabilise against evening peak demand scenarios.

If Indian policymakers realise EVs are batteries on wheels that too paid by the private owner, we can add massive amounts of grid storage via EV batteries at little cost to the government. EVs are fundamentally different from ICE cars in this way - EVs are part of our transport system AND our electricity grid. Current policy focuses only on ICE emissions, not realising the larger role EVs can play in making solar power scale up successfully in India.

[jashjacob]

Originally Posted by DriveDynasty

Then noise should continue even if we turn off the AC right? I dont think this is battery related, I think it was coming from AC compressor atleast in my case.

Yesterday evening, I checked after turning off AC and fan speed to 0. The noise is found. I had just taken the car off charging, so I assume it's the battery cooling system noise.

[KI07]

For me, the EV experience is going really well, touchwood.
Windsor has been an almost show-stopping thing in my circle, one of the first EV in my knowns, everyone asks a lot, tries to get knowledge of the range, maintenance and are actually taken aback as I serve the stats.

Its been 2 months now since the purchase and I am glad to say that I have lost interest in ICE cars except halo cars like the 911 or the kinds like the M2 Manual.

I am 'almost' never gonna buy an ICE car in the future, EVs are too good to be chauffeured in and for it to be the car driven by multiple people.
As there are minimal mechanicals that could go wrong.

I used to drool over the Octavia, M340i, X7 when I used to spot one on the road, but now I just look at them as a gas-guzzler and I look away as if they are obsolete.