EX Custom iOS/Android App

[Bernardo]

2 questions jump to mind.
- Why?
- Why not?

I am willing to believe it can pull a 100 hp. But with experience from 80 hp we know it will overheat fast and will surge in power as well.

Hola!

Be gentle to your batteries.
The specified max. discharge current per cell is 45A.
As the configuration is 100s4p there are always four batteries in parallel in 100 in series.
4 parallel cells make 180A max discharge current.
The impedance of one cell, including connections and wires, is about 0,008 Ohm. -> Four parallel cells have 0,002 Ohm.
The voltagedrop under full load is about U = R x I = 0,002 * 180A ~ 0,36V per "4 CELL parallel"
for 100 cells its ~ 40V.
Full batteries 420V - 40V drop ~ 380V DC BUS voltage
And with about 380V , under full load condition,
there is a possible maximal electrical power of P = U x I = 380V x 180A ~ 68kW or 93HP that can be drawn
from the tank within the technical spec. of the cells.

put some electrical losses into...
95% of the inverter x 90% of the motor ~ 0,85
Max. mech. power at the motorshaft 68kW x 0,85 ~ 58kW or 80HP.

And that is what we have - a system which is on the limit already.
Pulling more will kill the battery - soon or later.
Thermal problems, magnetic saturation in the motor, MOS-FET fireworks, blowing fuses - all included for free

the numbers may vary by a few percent up and down - depending on the point of view
and if a bag of rice has tilted in china.

And YES - it is very likely possible to squeeze a +100HP out of the system.

Bernardo

 

[Beagle]

Hola!

Be gentle to your batteries.
The specified max. discharge current per cell is 45A.
As the configuration is 100s4p there are always four batteries in parallel in 100 in series.
4 parallel cells make 180A max discharge current.
The impedance of one cell, including connections and wires, is about 0,008 Ohm. -> Four parallel cells have 0,002 Ohm.
The voltagedrop under full load is about U = R x I = 0,002 * 180A ~ 0,36V per "4 CELL parallel"
for 100 cells its ~ 40V.
Full batteries 420V - 40V drop ~ 380V DC BUS voltage
And with about 380V , under full load condition,
there is a possible maximal electrical power of P = U x I = 380V x 180A ~ 68kW or 93HP that can be drawn
from the tank within the technical spec. of the cells.

put some electrical losses into...
95% of the inverter x 90% of the motor ~ 0,85
Max. mech. power at the motorshaft 68kW x 0,85 ~ 58kW or 80HP.

And that is what we have - a system which is on the limit already.
Pulling more will kill the battery - soon or later.
Thermal problems, magnetic saturation in the motor, MOS-FET fireworks, blowing fuses - all included for free

the numbers may vary by a few percent up and down - depending on the point of view
and if a bag of rice has tilted in china.

And YES - it is very likely possible to squeeze a +100HP out of the system.

Bernardo

Thanks very much for sharing that.

Max discharge current value of 45 A is the spec for Molicel P45B used in the MX pack.

There is no official word on cells used in EX/MX1.2 packs but for instance Molicel P50B max discharge current is 60 A so theoretically that could be max power about 100 hp for those?

P60B has a max discharge current of 90 A so in the same configuration we would be looking at 150 hp

I hadn't thought that with newer cells we would not only benefit from more range and faster charge but also more power (as long as the motor and electronics can handle it).

 

[Erwin P]

That was what we were missing on the Varg, i was a bit low on power

I don't care if it could do 120 hp, my arm can only do about 48hp in MX setting.

 

[AbnormalWrench]

Rode the bike yesterday and today while using the app. For some reason I now get a pairing message every 30 seconds. It wasn't doing before. Yesterday, it eventually stopped communicating, but then I noticed my headlight wasn't on, which usually means the VCU is glitching. After turning it off and back on, that started working again. This morning it didn't stop communicating, but kept getting the message over and over.

Got the phone holder all worked out, works great!

 

[brongle]

Rode the bike yesterday and today while using the app. For some reason I now get a pairing message every 30 seconds. It wasn't doing before. Yesterday, it eventually stopped communicating, but then I noticed my headlight wasn't on, which usually means the VCU is glitching. After turning it off and back on, that started working again. This morning it didn't stop communicating, but kept getting the message over and over.

Got the phone holder all worked out, works great!

What do you mean by the pairing message, is that the system prompt or you mean the syncing/connecting splash screen in the app?

 

[AbnormalWrench]

What do you mean by the pairing message, is that the system prompt or you mean the syncing/connecting splash screen in the app?

it was an OS message overlay, saying the bike was requesting pairing. I went to take a screenshot of it, but my phone had forgot/erased the bike, it seems. I reentered the PIN and now it is working fine.

 

[DaveAusNor]

My app crashes on both the arkenstone and my s23 ultra when I try to enter the measurements menu. Stuck in F and mph

 

[JJ2]

My app crashes on both the arkenstone and my s23 ultra when I try to enter the measurements menu. Stuck in F and mph

View attachment 14643

Any news???

 

[brongle]

Any news???

I have a new version pending, should be available for testers in the next few days.

EDIT: Build is submitted on both Android & iOS which means we're just waiting for reviews. As always lots of changes under the hood but I've started putting the big-ticket items in the new dedicated changelog page within the app:



I'll be looking into getting both apps fully released in the next few weeks, so thanks for all the testing and feedback that's gotten me to this point.

 

[Erwin P]

Should i be worried over those 2 cells?
View attachment 14538

I contacted Stark and had a video call this morning. They did indeed find an issue (did not mention what) but they are replacing my battery.
Sad thing it now has to go through a dealer, but hey way better than a dying battery.

With the warranty expiring this november i think it's a rather good thing i had this app and found out before it died on me just after warranty!

 

[JJ2]

I contacted Stark and had a video call this morning. They did indeed find an issue (did not mention what) but they are replacing my battery.
Sad thing it now has to go through a dealer, but hey way better than a dying battery.

With the warranty expiring this november i think it's a rather good thing i had this app and found out before it died on me just after warranty!

What exactly was the content of the video call? How did starkfuture determine what was wrong with the battery in this video call? did you have to go through certain buttons or procedures or was starkfuture able to evaluate it all via an onair connection?

Did they immediately give you an analysis and tell you what was wrong with the battery and why they were replacing it?

After all: Really a good reaction from starkfuture to replace the battery

 

[Erwin P]

They asked me for the symptomes, wich i gave. They asked me to put the bike in standby/neutral (green blinking light). They needed a few minutes to download the data from my bike. They then told me they would get back to me with the results.

They did so within half an hour saying my battery needed replacement. No words on what is wrong with it.
They asked me wich dealer i liked to have the replacement done and that was about it for now.

 

[DaveAusNor]

Good outcome. I'm glad it was spotted early with the app. I wonder what options there will be in the future if a battery fails due to a few bad cells. If Stark will offer refurbishing of batteries for example.

 

[Erwin P]

That or if company's start to rebuild them.
Once again, many thanks for the app, will probably have saved me €3000. If they had declined my claim (since it's still working quite well) i would have added the 1 or 2 years extra warranty i suppose wich would have still been a bargain compared to the €3000.

However we are getting off topic.

Also a good thing about this app is that you can show potentional buyers the state of the battery. Wich is quite a hot topic i found.

 

[OpaTsupa]

Good result, Erwin. Now put it on 80hp and ride it like a rental.


@brongle ,
Can you get the HP and Regen values for specific (1-5) maps to show?
My preference would be: as large as possible map number in the middle of the screen and to the side current HP and Regen.
Battery SOC number not too large so that I don't obsess about it.

 

[sk8serg@gmail.]

They asked me for the symptomes, wich i gave. They asked me to put the bike in standby/neutral (green blinking light). They needed a few minutes to download the data from my bike. They then told me they would get back to me with the results.

They did so within half an hour saying my battery needed replacement. No words on what is wrong with it.
They asked me wich dealer i liked to have the replacement done and that was about it for now.

What symptoms did you tell to support?

 

[Bernardo]

Good question!
Did you mention the data from the app?

BTW... The Arkenstone -iPhone16pro adaper 3d files are online.
Thingiverse

Bernardo

 

[Erwin P]

What symptoms did you tell to support?

Those that were actually true. Last few % charging took longer than it used to and disappeared quicker than before. I allready noticed it, but thought it might be in my head and didn't think to much of it at first.
Also this weekend i drained it below 20% and it did take a couple of tries to get it on afterwards. Got a red solid light when i pushed the button. A few tries later it worked though.

In the end i didn't lie, but also didn't bother to be so complete as to tell them about the app.