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by CZeroOwner
Tue Oct 01, 2019 7:18 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 22906

Re: Battery Capacity Testing

It sounds like replacing the cells is a very good idea.

David
by CZeroOwner
Tue Oct 01, 2019 3:14 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 22906

Re: Battery Capacity Testing

DRMandrake asked for more details on the voltage differences between the cell in our car. Here 3 graphs showing the cell voltages at difference SoCs. The data for the first graph was collected on June 17 2019 and the second and third graphs are from April 13 2019. Note that the difference between th...
by CZeroOwner
Thu Sep 26, 2019 11:48 pm
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 22906

Re: Battery Capacity Testing

DBMandrake wrote:have you ever checked the spread of capacity of the individual cells?


Yesterday evening, just before charging the car, the SoC was 12.5%. At the same time, the highest cell voltage was 3.730 volts and the lowest was 3.700.

David
by CZeroOwner
Wed Sep 25, 2019 11:17 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 76
Views: 14150

Re: Is my battery dying ?

My car shows 8% SoC when the voltage is 3,63.

David
by CZeroOwner
Wed Sep 25, 2019 7:20 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 76
Views: 14150

Re: Is my battery dying ?

My battery was tested in the car. I wasn’t there but the procedure they told me they followed sounded very much like the one you described for the Diagbox. Could it be that the Diagbox knows that 3.63 volts is equal to a SoC of 10% and that the Ah it measures between 3.63 and 4.1 is 90% of the batte...
by CZeroOwner
Wed Sep 25, 2019 7:00 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 22906

Re: Battery Capacity Testing

Hi Simon

The guy at the shop said that there was little difference between the cells.

I believe that the degradation I'm seeing is due to the expected degradation of otherwise health cells from cycling and storage time but I'll check on the voltage difference between cells at low SoC.
by CZeroOwner
Wed Sep 25, 2019 4:11 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 76
Views: 14150

Re: Is my battery dying ?

A couple of weeks ago our CZero was in for service. Part of the service was a measurement of the battery capacity. I’ve written the results up in a post on the battery capacity testing discussion. The shop also told me that their test instrument showed that the expected capacity of a new battery is ...
by CZeroOwner
Wed Sep 25, 2019 3:34 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 22906

Re: Battery Capacity Testing

A couple of weeks ago our CZero was in for service. Part of the service was a measurement of the battery capacity. At the same time, I got the previous capacity measurement made 3 years ago. Here they are: https://i.ibb.co/L6Z8KSp/Service-measurements.jpg These values are plotted in the graph below ...
by CZeroOwner
Sat Aug 17, 2019 1:02 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 22906

Re: Battery Capacity Testing

According to the Yuasa tech report that I quoted in an earlier post, temperature should affect the capacity of the battery. Based on measurements on a new LEV50 cell Yuasa would expect the capacity to decrease from the nominal value of 50 Ah at about 30oC to 47.6 Ah at 0oC. However there is little o...
by CZeroOwner
Mon Jul 15, 2019 7:37 am
Forum: Instruments - Radio/USB/Nav - CAN - Climate Controls - Remote
Topic: Canion
Replies: 696
Views: 168718

Re: Canion

Over the years I used CanIon, I ended up with 13 different SQLite databases. Some contained overlapping data which made it difficult to track when and how much data I had collected. To do the data analysis shown elsewhere on this forum I had to bring this data together in one consistent DB on my PC....

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