Your battery voltage - truck off and at rest

[ShadowsPapa]

I thought he was talking about a proper battery tester, they are not the same thing at all. The monitor is just a voltmeter. The testers are larger do bunch of other functions.

Got off track when he started mentioning testing when I was mentioning only monitoring voltage (at various stages) and mentioned your devices can't test or know much more that voltage drops under load, etc.
He called your device a "BT tester" or was referring to BT testers (which really wouldn't work here anyway)

I had interest in how your devices were connected, and how you managed and then you said you had two of them.
Testing is a different animal and not a part of where I was going with things here.
Checking, tracking, monitoring voltage (sitting not running and driving, etc.)
So for that, wiring devices to each battery to watch for voltage drop while it sits unused, or while it's in an ESS stop event can be of interest.

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[jebiruph]

Got off track when he started mentioning testing when I was mentioning only monitoring voltage (at various stages) and mentioned your devices can't test or know much more that voltage drops under load, etc.
He called your device a "BT tester" or was referring to BT testers (which really wouldn't work here anyway)

Sorry for the confusion, but not the education, thanks for the info.

 

[ShadowsPapa]

Sorry for the confusion, but not the education, thanks for the info.

I learn something new every day - sometimes many times that. It's a goal.
I'm pretty convinced that the 2022 is a bit different in how it charges the batteries vs. the 2020 - although the differences could be atmospheric or due to observation differences.
But the fact that after sitting 5 hours, my batteries today sat at 12.67 volts was interesting.
I am also curious as to how clean the power is coming out of the alternator, and need to increase my efforts into getting a new scope to hook up to the truck. (and for use with analyzing alternators I work on as it saves a ton of time knowing potential issues before even opening something up)
For now I think I'll skip upgrading my old Fluke with a new one and go some different directions.

 

[fabianovalless]

Ok I just saw a little bit about the batteries, now this is my story (I’m sorry for my english I don’t know too much)
I have a 2022 rubicon
I always saw my battery voltage over 13.00 13.7 13.4 etc…
Today Driving back home, I notice battery voltage 12.8V And changing to 12.7V and I was kind like weird to me.
Tomorrow I’ll see battery voltage in turn off!
I read 12.8 V is good, So Idk… I don’t have any problems starting my jeep or any lights, I don’t use ESS(I hate it) I got a tazer so It keeps off!

 

[ShadowsPapa]

(I’m sorry for my english I don’t know too much)

I know people who were born, "educated" and raised in the Midwest United States who can't put a sentence together as well as you have.
Keep practicing, keep using it, and read. You'll get better and then you can take pride in it.
You are already doing very well. In other words, you have nothing to apologize for.

I always saw my battery voltage over 13.00 13.7 13.4 etc…
Today Driving back home, I notice battery voltage 12.8V And changing to 12.7V and I was kind like weird to me.

13, 13.7 and so on indicate a battery that is likely fully charged and it is in "maintenance mode". The system is just keeping it up and ensuring there is enough power to supply the truck and not take anything out of the battery while operating.
If it dropped to 12.8 or 12.7 it is possible that it used all of the fancy math and algorithms programmed into it and decided that the battery was not only fully charged, but perhaps hot (I see you are in Texas where warm to hot is the normal). In those cases, or if you need extra power from the engine, it will cut off the alternator a bit to keep from making the battery too hot, and perhaps allow some extra power from the engine.
It takes power from the engine to charge the battery. In times where the battery is fully charged or close to fully charged, it will try to get better mpg and supply you with more engine power by preventing the alternator from using engine power to charge a battery that is already full - or that is hot.
Heat is bad for batteries. Some fancy charging systems for other industries use battery temperature as a means of determining how much charge goes in. These are not far from that method as it does track the battery temperature.

I suspect your battery with the Jeep sitting, engine not running, will show a battery voltage at rest of at least 12.6, maybe even 12.7.

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