question

abeness avatar image
abeness asked

BMV-712 historical data is inaccurate in latest FW

I recently upgraded my battery box, and reset my BMV-712 (FW 4.16, latest) historical data for the new prismatic cells. I then ran an inverter test with 1500W heat gun to see how it went (great; approx. 136A draw). Unfortunately, I neglected to save live screenshots at the time, and I was disappointed to discover on attempting to view the Trends data later, that a full day covering the period I wanted to explore, had been lost from history:

bmv-712-historical-data-loss1.png

bmv-712-historical-data-loss2.png

I subsequently ran another test on Friday eve over the course of an hour, with several rounds of ~300-ish and 600-ish watt draws, and saved live screenshots. I then returned tonight to review the trend over time, and discovered that the historical data shows a completely different curve than I had saved at the time:

Live:

bmv-712-live-on-date1.png

bmv-712-live2-on-date1.png

Historical, and wholly inaccurate:

bmv-712-historical-on-date1.png

This seems to be a FW bug in 4.16, as I don't remember such wildly inaccurate data in the past. I'm using VictronConnect 6.07, latest for iOS. I created a service report, but it is not human-readable. How best to report this to the developers? Surely not only through a local dealer.

BMV Battery MonitorVictronConnect
bmv-712-historical-data-loss1.png (98.0 KiB)
bmv-712-historical-data-loss2.png (93.9 KiB)
bmv-712-live-on-date1.png (102.2 KiB)
bmv-712-live2-on-date1.png (100.6 KiB)
bmv-712-historical-on-date1.png (92.3 KiB)
7 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

abeness avatar image abeness commented ·
Sorry, it seems that the image size editor does not work. I had set all of these to 300px wide before posting. One for the forum developers.
0 Likes 0 ·
Thiemo van Engelen (Victron Energy staff) avatar image Thiemo van Engelen (Victron Energy staff) ♦ commented ·

Hi @abeness

You can attach the service report to a comment or answer here.

It would be really helpful when you can create a service report each day for a few days and post them here.

Kind regards,

Thiemo van Engelen

0 Likes 0 ·
Show more comments
Thiemo van Engelen (Victron Energy staff) avatar image Thiemo van Engelen (Victron Energy staff) ♦ commented ·

Hi @abeness

In the days around the 1500W load test, was the battery monitor disconnected for approx a day? The data does indicate that it is missing a full day somewhere between 17th june 9:53 pm and 20th june 0:22 am.

Kind regards,

Thiemo van Engelen

0 Likes 0 ·
Show more comments
2 Answers
kevgermany avatar image
kevgermany answered ·

I'll pass it on for you.

1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

abeness avatar image abeness commented ·
Thank you!
0 Likes 0 ·
Thiemo van Engelen (Victron Energy staff) avatar image
Thiemo van Engelen (Victron Energy staff) answered ·

Hi @abeness

Thank you for the service reports. We are still investigating, but they do seem to hint in an error somewhere in the software, which might explain the day of testing that was lost.

Then regarding all the other charts. The loss in precision is indeed caused by averaging that is done to limit the number of samples for older data. The most recent 2 minutes is stored with an interval of 1 second, but as the data ages, it is averaged over an increasing period. The oldest data has an averaging period of 30 minutes. So a test of a few minutes will not show up anymore in that data.

Kind regards,

Thiemo van Engelen

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.