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AGM battery only charging with 14.3V

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447 views 3 replies 3 participants last post by  axmax  
A
#1 · (Edited)
Hello people,

I got a problem which is bugging me for months now. And I am getting nowhere. I bought a used Opel Vivaro 2019 (basically a Peugeot Expert) and the fitted SFB battery seemed near its end of life. So I installed a fully loaded AGM and all this ECO mode stuff got better.

But I issues with battery started again.

Soon I realized that the maximum loading voltage is 14.3V going down to 13.9-14.0V on longer distances. As far as I know an AGM would need to see 14.8V now and then, but the max I see is 14.3V.

So I connected to the BECB_GEN2 and luckily diagbox let me into the configuration without internet. I changed the setting from SFB to VRLA/VRLA2 which is the closest to get for AGM. No change in loading volatages.

I read several relating threads in these forums, but I did not find anything exactly to my issue.

The max 14.3V loading volatage - what could this be an indicator for? Some defective BECB?

Any help would be appreciated
regards
Axel


Edited:
as a follow up .. I coded the BECB with other options too .. for instance "liquid" .. there is absolutedly no change in loading behavior. Too bad all BSI stuff needs internet and token. But even that is no really possible anymore for privates :/
 
#3 · (Edited)
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#4 ·
Mostly I was curious to why it goes to max 14.3V and then goes to 14.0 within the an hour. In parallel and for the last 10 years I have been driving a Skoda Octavia with auxillary heater and there the voltage did rise to something about 14.8. I do not remember the exact curve. And the battery is doing a good job. So for my impression the voltage has been too low in my PSA car. It was just the first obvious difference which caught my eye.

The above being paired that the battery seems a little weak and the voltage dropping rather quickly. So I measured the voltage and I thought hey ... the loading voltage should be higher for my impression. I suppose the sum of electrical components of my Vivaro Cargo is not much higher than the components of my Octavia. Of course this is speculation.

But I see that a closer look at the power consumption during sleep is a must now. Thanks to all for the replies!
 
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