Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic
1 | ... | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | ... | 254

gzt

gzt
15508 posts

Uber Geek

Lifetime subscriber

  #2036202 13-Jun-2018 21:22
Send private message quote this post

Has Greencabs added data to flip the fleet?

 
 
 

Free kids accounts - trade shares and funds (NZ, US) with Sharesies (affiliate link).
paulchinnz
Circumspice
780 posts

Ultimate Geek

Trusted
Lifetime subscriber

  #2036208 13-Jun-2018 21:34
Send private message quote this post

I'm also interested to hear flip the fleet thoughts on the greencabs post.

 

I wonder though: perhaps greencabs dataset are an outlier because their use as a commercial taxi company is so different to the average private driver. If you need to drive ~200km/day and quick charge 2-3/day to maintain good battery, that's too much effort for most people and the flip the fleet data are still relevant.


gulfa
321 posts

Ultimate Geek
Inactive user


  #2036318 14-Jun-2018 07:35
Send private message quote this post

Other thoughts

 

Do cheap OBD2 devices and the use of Leaf spy lite give different readings. Leaf spy lite could be poorly written like many software programs.

 

My30 Kw Leaf (UK) Readings are all round the place Varying from as low as 82% SOH to 84% My last 25% of battery regularly show 50+ Kms left on the GOM 

 

My battery has not degraded in the last few months since I have used the OBD2 tool I have a cheap one and use Leaf Spy Lite My last charge to 100% showed 188kms on the Gom This was after some Motorway driving but mainly around town.

 

Leaf spy showed it had only charged to 97.4%. I intend to test a full drive around town (50 kph only) to see what sort of KM I get and then do a full charge (fast) to see what the GOM reports.

 

I do wonder about the software and the cheaper OBD2 devices.

 

These are only my unscientific findings




redmouse
69 posts

Master Geek


  #2036324 14-Jun-2018 08:17
Send private message quote this post

I don't think the quality of your OBD2 device or of the app is distorting your readings. SOH is a message that's passed over the car's data bus and Leaf Spy just observes and displays it.

 

The state of charge shown in Leaf Spy is different to that reported on the dash. Leaf Spy reports the true state of charge of the battery pack, the car shows the charge over a smaller range; when you fully charge it's not actually 100% full and when it reports 0% (or -- Arghhh!!) it's not completely empty. I guess this is to protect the battery. I have found that on my 24 kWh the Leaf Spy SOC and the car's SOC only intersect at about 80%. 


SaltyNZ
7174 posts

Uber Geek

Trusted
2degrees
Lifetime subscriber

  #2036326 14-Jun-2018 08:18
Send private message quote this post

Leaf Spy - Lite or Pro - simply reads the numbers reported by the battery computer. Whether the OBD2 dongle is cheap or not makes no difference either for the same reason. The dongle is simply the channel over which Leaf Spy reads out the battery computer's opinion.





iPad Pro 11" + iPhone 15 Pro Max + 2degrees 4tw!

 

These comments are my own and do not represent the opinions of 2degrees.


happyfunball
287 posts

Ultimate Geek


  #2036357 14-Jun-2018 09:35
Send private message quote this post

frednz:

 

Based on that, here's some recommendations that may help you get the most from your Nissan Leaf battery (from a taxi companies perspective, of course):

 

     

  1. Charge to 80% rather than 100%.
  2. Charge at 25% rather than running the battery low.
  3. Use the car.
  4. Don’t be afraid to fast charge."

 

It would be good if the "Flip the Fleet" people could comment on why not all 30 kWh Leaf owners are in fact experiencing the fast battery degradation problem. Is their research robust enough to take the above facts into account?

 

 

I think its fair to say a Taxi companies usage of the cars is not really relevant to most people in NZ.  They are clearly a special case, if their batteries were degrading faster nobody would be surprised.

 

The fact that their batteries seem to be doing much better than the average points to a possible issue with the BMS on the cars, which is estimating the state of the chemical composition of the batteries.  Its just an estimate and its not 100% accurate, but its important because the BMS controls the amount of charge put in and taken out of the battery.  So even if the degradation is just because of a pessimistic BMS, its still real and affects the usage of the car.

 

I think others on this forum and other forums have shown that 'exercising' the battery pack increases the BMS's optimism and allows you to increase your SOH and range.  Fast charging seems to also help a lot.  Greencabs is doing both so they are keeping their BMS estimate higher that way.

 

I think if they sold those cars to the average Kiwi today, who drives < 15000km a year, the SOH, usable capacity and range of those cars would plummet and those buyers would not be happy about it.

 

 


SaltyNZ
7174 posts

Uber Geek

Trusted
2degrees
Lifetime subscriber

  #2036364 14-Jun-2018 09:54
Send private message quote this post

It would also be interesting to find that multiple rapid charges daily is actually good for the battery long term. That goes very much against the received wisdom of rapid charge == hot battery == battery damage.





iPad Pro 11" + iPhone 15 Pro Max + 2degrees 4tw!

 

These comments are my own and do not represent the opinions of 2degrees.




happyfunball
287 posts

Ultimate Geek


  #2036373 14-Jun-2018 09:59
Send private message quote this post

SaltyNZ:

 

It would also be interesting to find that multiple rapid charges daily is actually good for the battery long term. That goes very much against the received wisdom of rapid charge == hot battery == battery damage.

 

 

Batteries degrade with usage, if somebody could make a battery that got better, it would be a major scientific breakthrough!

 

Its much more likely a problem with the batteries and/or their software.

 

 


SaltyNZ
7174 posts

Uber Geek

Trusted
2degrees
Lifetime subscriber

  #2036376 14-Jun-2018 10:04
Send private message quote this post

happyfunball:

 

Batteries degrade with usage, if somebody could make a battery that got better, it would be a major scientific breakthrough!

 

 

 

 

Well, yes of course, but I mean that the received wisdom is that they degrade faster on a per-km basis if you're constantly fast charging them vs. slow charging so they stay cool.

 

 





iPad Pro 11" + iPhone 15 Pro Max + 2degrees 4tw!

 

These comments are my own and do not represent the opinions of 2degrees.


happyfunball
287 posts

Ultimate Geek


  #2036383 14-Jun-2018 10:16
Send private message quote this post

SaltyNZ:

 

Well, yes of course, but I mean that the received wisdom is that they degrade faster on a per-km basis if you're constantly fast charging them vs. slow charging so they stay cool.

 

 

I think they degrade more with age rather than usage, according to the Nissan owners manual anyway.  They expect 80% SOH after 5 years, milage doesn't seem to  figure into it.

 

I guess it could degrade slower charging one way instead of another without violating the science, as long as it was still degrading overall.  There is an optimum charge rate, and deviation from that causes more degradation, so I guess  somebody could make a battery that was healthier using fast charges rather than slow, but I've never heard of it?  Would be useful for taxi companies.

 

As it is, its supposed to be better to charge at 240v 16A than it is at 120v 10A because the optimum charge rate is higher than the US home socket default.

 

 

 

 


frednz
1458 posts

Uber Geek


  #2037845 14-Jun-2018 20:04
Send private message quote this post

http://www.cleanfleetreport.com/exclusive-nissan-leaf-battery-fix/

 

From the above:

 

"Nissan released a statement today about a fix for 2016 and 2017 Leaf battery electric cars that are experiencing indications that their vehicles’ 30 kWh batteries were losing range and capacity at an accelerated rate.  Owners of these EVs were reporting that their cars were losing as much as 25 percent of their car’s range and battery capacity in as little as 15,000 miles."

 

Nissan Customer Service Campaign Statement

 

On June 6, 2018, Nissan began conducting a customer service campaign in North America to reprogram the lithium-ion battery controller in 2016 and 2017 model-year LEAF vehicles equipped with a 30-kWh battery, to correct the calculation used for the battery capacity level gauge and distance remaining of the vehicle.

 

The displayed vehicle range and battery capacity level gauge on these vehicles are displaying range and capacity that is lower than the actual amount. Reprogramming the controller will result in an accurate display of the LEAFs battery capacity and trip range.

 

This service campaign is open to all 2016 and 2017 LEAFs regardless of mileage or if they have had their battery previously replaced.  Owners should contact their local dealer to schedule the update. After the reprogramming, the balance of the original lithium-ion battery and battery capacity warranty will remain in effect for any customers who experience warrantable battery degradation.

 

So, what do you think of that?

 

 

 

 

 

 

 

 


gulfa
321 posts

Ultimate Geek
Inactive user


  #2037850 14-Jun-2018 20:12
Send private message quote this post

Good news Just need to wait for the software to get distributed to NZ Shouldn't take long


happyfunball
287 posts

Ultimate Geek


  #2037863 14-Jun-2018 20:26
Send private message quote this post

frednz:

 

"Nissan released a statement today about a fix for 2016 and 2017 Leaf battery electric cars that are experiencing indications that their vehicles’ 30 kWh batteries were losing range and capacity at an accelerated rate.  Owners of these EVs were reporting that their cars were losing as much as 25 percent of their car’s range and battery capacity in as little as 15,000 miles."

 

So, what do you think of that?

 

 

Thats timely, and seems to indicate its a BMS problem.  The statement says no increased range though, so I wonder if this is just moving the bars around like they did on a previous Leaf update.  Hopefully not!


SaltyNZ
7174 posts

Uber Geek

Trusted
2degrees
Lifetime subscriber

  #2037944 15-Jun-2018 07:11
Send private message quote this post


Tthe dealer advice. So it’s definitely true...




iPad Pro 11" + iPhone 15 Pro Max + 2degrees 4tw!

 

These comments are my own and do not represent the opinions of 2degrees.


gulfa
321 posts

Ultimate Geek
Inactive user


  #2038067 15-Jun-2018 09:57
Send private message quote this post

Good to see Autolink are on the ball

 

Just received this email From Sarah Ryan

 

Please see Nissan’s announcement below regarding the 30kwh battery models.

 

We have been advised there will be a recall to update the software. No time frame as of yet. We will keep you updated as further information becomes available.

 

Kind regards,

 

Sarah


1 | ... | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | ... | 254
Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic





News and reviews »

Synology Introduces BeeStation
Posted 23-Feb-2024 14:14


New One UI 6.1 Update Brings Galaxy AI to More Galaxy Devices
Posted 23-Feb-2024 10:50


Amazon Echo Hub Available in New Zealand
Posted 23-Feb-2024 10:40


InternetNZ Releases Internet Insights 2023
Posted 20-Feb-2024 10:31


Seagate Adds 24TB IronWolf Pro Hard Drives for Multi-user Commercial and Enterprise RAID Storage Solutions
Posted 19-Feb-2024 16:54


Seagate Skyhawk AI 24TB Elevates Edge Security Capacity and Performance
Posted 9-Feb-2024 17:18


GoPro Releases Quik Desktop App for macOS and Introduces Premium+ Subscription Tier
Posted 9-Feb-2024 17:14


Ring Introduces New Ring Battery Video Doorbell Pro
Posted 9-Feb-2024 16:51


Galaxy AI Transforms the new Galaxy S24 Series
Posted 18-Jan-2024 07:00


D-Link launches AI-Powered Aquila Pro M30 Wi-Fi 6 Mesh Systems
Posted 17-Jan-2024 20:02


Newest LG 4K Lifestyle Projector Doubles as Art Objet
Posted 9-Jan-2024 15:50


More LG Smart TV Owners Set To Enjoy the Latest webOS Upgrade
Posted 9-Jan-2024 15:45


Panasonic Announces the Z95A and Z93A With Fire TV Built In
Posted 9-Jan-2024 15:30


Amazon Echo Pop Review
Posted 8-Jan-2024 14:22


Samsung Tab S9 FE Review
Posted 17-Dec-2023 08:26









Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.







GoodSync is the easiest file sync and backup for Windows and Mac