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Old 01-24-2017, 01:29 PM   #1
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Battery disconnect and Tri-Metric battery monitor

I have a Tri-Metric TM-2025 battery monitor that was installed in my Escape by AM Solar when I had additional solar panels installed on the trailer. If I disconnect my batteries at the negative terminal will this "reset" the monitor so that it no longer accurately displays the state of charge of the batteries?

I realize I could eventually figure this out for myself if I read the rather dense Tri-Metric manuals, but I thought someone here might know off the top of their head. I want to avoid the process of re-calibrating the monitor if possible.
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Old 01-24-2017, 01:43 PM   #2
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If I recall the Trimetric shunt was connected to the negative, so it will have to be reset. this was one of the issues I had with it in another trailer, every time I turned the master switch off. When I sold the trailer I never replaced it in later units.
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Old 01-24-2017, 03:36 PM   #3
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Quote:
Originally Posted by Mike Lewis View Post
I have a Tri-Metric TM-2025 battery monitor that was installed in my Escape by AM Solar when I had additional solar panels installed on the trailer. If I disconnect my batteries at the negative terminal will this "reset" the monitor so that it no longer accurately displays the state of charge of the batteries?

I realize I could eventually figure this out for myself if I read the rather dense Tri-Metric manuals, but I thought someone here might know off the top of their head. I want to avoid the process of re-calibrating the monitor if possible.
Even after reading the manual, I don't know how long the TriMetric holds settings with the battery disconnected, but it looks like it will cause a reset.

I'd check with the manufacturer of your controller to be sure disconnecting the battery without disconnecting the solar panels won't damage the controller. Some manufacturers require disconnecting the panels first, or covering them so there is no output.
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Old 01-24-2017, 04:57 PM   #4
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Yeah, that's what I was afraid of. I'd better leave everything connected up.

I asked because I intend to install a power line for a ham radio, which normally would go directly to the batteries. I know the negative wire will have to go to the shunt instead of directly to the negative battery terminal. Since the other end of this power line will end in a connector, I won't be completing a circuit when I connect the wires to the positive battery post and (negative) shunt, so I should be able to do it without disconnecting anything else.
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Old 01-24-2017, 07:06 PM   #5
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When I switched my battery from single to dual 6 volts, I did nothing to my solar, I merely disconnected the ables removed and reinstalled the battery and revoked up the cables. Was this wrong with the solar set up/ How does one remove the battery over the winter with solar? A whole new bunch of questions now?
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Old 01-24-2017, 07:33 PM   #6
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Mike, you mentioned you have the Bogart TM-2025 monitor, do you also have their controller, the SC-2030? or do you have a different brand. I ask as a non Bogart controller has no settings set in the monitor where as the SC-2030 does.

Having both Bogart products I seem to recall only a few settings were lost when dropping power. Don't know if the same is true for a monitor only install, I couldn't find any.

I'd just go thru the settings and write them all down then disconnect and see what happens. Can always give Bogart or AM a call.

FWIW, I've disconnected the batteries with the panel connected and with it not connected, no damage done but I don't know which way is the right way.
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Old 01-24-2017, 07:54 PM   #7
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I have only the Bogart battery monitor, not their solar controller. AM Solar offered to install a new solar controller as well, possibly the Bogart, but I declined due to budget. So I have the solar controller that came with the trailer.
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Old 01-24-2017, 08:38 PM   #8
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I do not recall having to reenter the settings into the Trimetric after disconnecting the battery. I thought the Trimetric was using an EEPROM to store the settings and therefore they would hold. Now that I say that I know that I wrote down the L1, L2 etc settings so maybe I am entering them in the spring when reconnecting. It can't take more than a few minutes to enter those few settings.

Coming out of storage in three weeks for a trip south, I will let you know for sure at that time.
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Old 01-25-2017, 04:08 PM   #9
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If I owned a Trimetric, I might add a separate switch from the +12 volt line to the Trimetric to be able to shut it off separately from main power.

Instead, I bought the Victron Energy BMV-700 battery monitor, which supposedly doesn't have this issue because it stores settings and history in non-volatile storage. I have yet to install the monitor, so I'm going off what a dealer told me when I asked, and Victron Energy's product information which lists the change in the newest version of their battery monitor. The 600 series battery monitors lost their settings.
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Old 01-26-2017, 08:44 AM   #10
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I contacted Bogart Engineering. I was told that when I disconnect power the "% full" reading will go away until the batteries are fully charged again, then it will come back and be accurate. Monitor setpoints P1 and P2 are involved:

P1 - charged setpoint voltage
P2 - charged setpoint amps

When the batteries are charged higher than the P1 voltage and the charging amps drop below P2, the monitor considers the batteries to be charged. Apparently the P1 and P2 settings do not go away when power is removed from the monitor.

I forgot to ask about the solar panels. I saw that the solar panel ground was connected to the same shunt terminal as the other ground wires. So it should be okay to disconnect them all at once, but I'll cover the solar panels first just to be safe.
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