Sv: Valg av farge

[Poppe]

This has now happened to me twize both after Think has been dischareged till 5-10% remaining energy. Both times after my son has been driving and set it to charge.

Heres the full story:
I came home on thursday afternoon with some 50% remaining energy and plugged it in. My son who sometimes use it unplugged it (dont know when) and drove off to a friend. He came back later with 5-10% remaing and plugged it in.
On friday morning I was going to take the Think to work as usual. Did not check the state of the "charging light", unplugged it and got in. Checked the energymeter and it was showing about 60% which seemed reasonable. Started the car and drove off.
After not too many meters I realize the "empty tank" light is lit. Energymeter is still at about 60%. Wierd !
Just to make sure nothing strange is going on I stopped the car. Turned it off and then back on again. This time the energymeter only goes to 5-10%. WTF !

I drove it back and plugged it in and the behavior then is as expected when plugging in. The ding-ding-ding is heard from inside and the charing light is turned on. Luckily we have several cars so I took another one to work.
Some hours later my son got out and could take the Think to school so it hade started to charge.

Like I said, this has happened twize. I asked my son to listen for the ding-ding-ding after plugging in but he said he always do. Also on thursday evening he confirmed it was heard.

Is this some behavior anyone else has seen ?

What causes it ?
Apparently when plugging in the second time (6-12 hours later) the charging starts normally.
I have told the son, next time he comes home with this low energy left he shall inform me so I can go out some hours later to check if charging has started.

What can be done about it ?
It's not a big problem but could be a symptom of something worse to come. I have been driving the car about 13000 km the past year and have never returned with such low energy.
Maybe the solution is to wait untill my son moves out of the house 

[hma]

First of all; I think a OVMS-kit is what you need. It provides charging status and alerts to your smartphone. Then you will know exactly what is going on.

Second; from your explanation I get a feeling that the car not regularly is charges to 100% (?). If you charge and discharge between 80% SOC for a long time, you risk that the chemical "state of charge" is not synchronized with the calculated "state of charge".

Do you have the new Nikometer still installed? Do you reach End of Charge? And what is the pack voltage at EOC?

[Poppe]

Yea, I might consider an OVMS-kit.

Whats the definition of regulary ? Most of the times when I charge at home overnight it gets to 100%. Not when I charge at work though. Maybe 1/3 of charges  is charging to 100%. I know about the chemistry problem but can not see this is such a problem.

Yes, I have the Nikometer installed.
Yes I reach eoc.
Will check the voltage later.

[Poppe]

At 99.9% charge (as high as it goes) I have 373,3 V after eoc.

[hma]

Is that right before end of charge is detected, or after?
Any dead cells? (that maximum voltage would indicate one faulty cell per string.
However, I don't think this is relevant for the behavior you are experiencing  in bottom SOC-range. It might be a bug in the PCU-sw(?).
Do you know which sw-version your PCU is running?

[Poppe]

The voltage mentioned is a while after eoc, probably less than 1 hour after.
The charger was unplugged before the voltage check (by Nicometer).

How would I know what sw the PCU is running ? Would OVMS tell me ?

Edit:
I just found in another thread conserning fast charging with different PCU's:
You (hma) wrote:
"This means Poppe has a Gen0 PCU rev F."


Edit 2:
Another thougth struck me. Where does the SOC information come from ?
Like stated above the 60% SOC indicated on friday morning seem very reasonable for a charge going on from the evening (exact time unknown) till 0600 in the morning when I leave for work. Something in the car thinks the charging is normal when in fact there is no charging taking place.