Battery Charging Observations

[fordtruckman2003]

I think that is assumed to be the amp reading from the BMS monitoring. I have not compared that to Forscan value as seen in YouTube video about BMS. It was frequently negative values for me in traffic going to work.

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[Snakebitten]

What does vehicle battery current mean with the Obdlink? Mine is almost always at 2.0 Amp. Is it what the alternator is charging the battery at?

I've always considered it the amount of current from the DC/DC converter that is not being consumed by the 12V system. In other words, AGM charging current. Like a 2 Amp trickle charge if it's a positive 2.
If it's a negative integer, it is current leaving the AGM.
You'll usually see a healthy negative integer right as you start off from a dead start and accelerating.

 

[PlatinumPat]

I put a battery monitor on my powerboost yesterday and this morning on the way to work it was reading 15.15 volts charging throughout my 10 min/3 mile drive. In fact I watched it drop down to 13.2 ish momentarily around 4 times but would jump right back up after a few seconds. Yesterday I took two short trips, one showed 14.7 charging and the other 14.65. I think my battery has been hovering around 12.59 resting volts. I have read that anything over 14.75 volts could be considered over charging.

Has anyone else seen charging at 15v+?

I have the FIXD app connected to my 21’ PB and regularly see 14.7 to 15+ volts but that was before the new power train and battery “fix” update I finally just got to DL about 2 hours ago…long story but I had to reset the BMS bc it kept getting interrupted and that along with disabling my motion sensors were some of the last things I resorted to smh…but it worked. Now I’m DLing the audio preset update right after finishing the Powertrain update…they seem to be coming in droves now….

also my resting Battery voltage with just the screen on before I exit the truck is 12.3-12.4…which made me buy a battery tender today as my final option to get the last update to Install…I assume this is kind of low but haven’t been able to get a firm answer in my searches tbh

I’m curious to see what my charging while driving voltage will be now that I got the battery update to install…I ran the truck for a few min after checking the update status to find it worked and the battery was about 14.6-14.7V while idling

 

[Gros Ventre]

Info on battery charging... May provide some insight into Ford's programming. Note that charging voltage rises with lowering temperatures. Also here's a link to more detail from Battery University: https://batteryuniversity.com/article/bu-403-charging-lead-acid (This is the See Also link in the 2nd paragraph.)

 

[Gros Ventre]

In reflecting on the above, it strikes me that the temperature sensor that Ford has installed may be somewhere that keeps it very near to outside air temperature. That might explain the numbers I'm seeing. Seems like in the winter time out my way the system voltage stays high... but sometimes it'll drop down to 12 .8 VDC when parked and idling for awhile...
Hm-m-m...

 

[Gros Ventre]

Some info on AGM BAtteries:
https://batteryuniversity.com/article/bu-201a-absorbent-glass-mat-agm

 

[Hyins]

https://www.f150gen14.com/forum/thr...ge-how-to-power-accessories.13862/post-452723

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