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Old 09-29-2013, 01:45 PM   #1
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Battery Monitor Panel Accuracy

Just a quick question:

How accurate are the level indicators on the stock panels? For instance, when the panel indicates 50% or 75% battery, roughly what voltage should the batteries be at?

I'll find out for sure in a few weeks when I dry camp for the first time in this trailer, but I was just curious if anyone knew off the top of their head. My last trailer didn't have an indicator and I just used a multimeter to watch them. Until I get around to installing a panel inside, that's what I'll still do. I'm hoping that it's scaled to around 12.2V at empty. I wouldn't even start to check them until 50% if that were the case.
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Old 09-29-2013, 02:24 PM   #2
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My old battery days... A battery(lead acid) is supposed to be fully charged at 12.6v. This also has to do with specific gravity. My assumption is if it's "normal" then it would be charged. A 12v reading should be 50%
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Old 09-29-2013, 02:37 PM   #3
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I just re-read my post. Mine generally read about 12.9-ish when fully charged. I never run them below 12.3V as 12.2 is around 50% charged most of the time. What I was really curious about was, for instance, if the lights on my panel inside show 50%...is that about 12.2V, or are they scaled differently? Like I said, I'll find out for sure (at least on my unit) in a few weeks. I figured somebody here would have experimented a little.
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Old 09-29-2013, 02:39 PM   #4
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Quote:
Originally Posted by Iwannacamp View Post
My old battery days... A battery(lead acid) is supposed to be fully charged at 12.6v. This also has to do with specific gravity. My assumption is if it's "normal" then it would be charged. A 12v reading should be 50%
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Old 09-30-2013, 09:13 AM   #5
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Quote:
Originally Posted by BarryD0706 View Post
See picture:
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I have this exact graphic next to my TM-2025 battery monitor!
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Old 09-30-2013, 09:21 AM   #6
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I have this exact graphic next to my TM-2025 battery monitor!
So let's ask the same question of you that the OP is asking for the cheapie monitors: Does your "% Full" read relative to 50%-SOC or relative to 0%-SOC?
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Old 09-30-2013, 09:31 AM   #7
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Originally Posted by BarryD0706 View Post
So let's ask the same question of you that the OP is asking for the cheapie monitors: Does your "% Full" read relative to 50%-SOC or relative to 0%-SOC?
That one is easy! It is in the monitor manual. Look to the right on the graphic of a typical panel. the lights to not read like the tanks.

They read "C", "G", "F", and "L"

All four lights mean: CHARGING - Voltage above the fully charged voltage

three lights mean: GOOD - Voltage above 50% discharged - use ok

TWO lights means FAIR - VOLTAGE VERY LOW (less than 50%) - MUST BE RECHARGED to avoid battery damage.

ONE light means LOW Voltage above 6 volts (enough to power the light) and damage IS occurring.

NO LIGHTS - Battery removed or too dead to recharge.
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Old 09-30-2013, 10:12 AM   #8
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Quote:
Originally Posted by BarryD0706 View Post
So let's ask the same question of you that the OP is asking for the cheapie monitors: Does your "% Full" read relative to 50%-SOC or relative to 0%-SOC?
I wasn't very clear about this but, yes, this is exactly what I was getting at.

Quote:
Originally Posted by herk7769 View Post
That one is easy! It is in the monitor manual. Look to the right on the graphic of a typical panel. the lights to not read like the tanks.

They read "C", "G", "F", and "L"
I don't have a stand alone panel...it's integrated into the switch panel and shares lights with the tank levels. All that's marked on it are E, 1/3, 2/3, and F ( I think...I'll go check in a little while). I'm double checking all of my manuals, but I don't remember ever seeing one for the panel.

I always meant to put a Trimetric unit on my last trailer and never got around to it. It's definitely on the list for this one, just probably not until after the first of the year.
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Old 09-30-2013, 11:27 PM   #9
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I think you will find the battery legend is as I described.
However if it is not so marked, I would assume the lights still represent the voltage values I listed.
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Old 09-30-2013, 11:33 PM   #10
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It is...I finally managed to go look at it. From the experience I have with 12V, that panel is completely useless to me. Full may not be full and good, well....isn't. Once it comes off of full it could be anywhere between 50 - 90%. Kind of defeats the purpose. I may just go ahead and order a 2025 tonight, it'll beat the constant multimeter checking (I'm kind of paranoid with my batteries).
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