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cottersay 06-20-2021 02:52 PM

Victron BMV 712 Smart battery monitor WTH?
 
I have the Victron BMV 712 Smart battery monitor (with two 100Ah BattleBorn Lithiums), and the monitor works great when boondocking, but not on shore power. The readouts then make no sense: State of Charge (after a week on shore power): 13% (and dropping); Voltage 14.44V; Current: -2.52A; Power: -36W; Consumed Ah: -186.9Ah.

Anyone have any idea what's up here? :confused:

Thank you!

-Cotter

twinboat 06-20-2021 03:14 PM

You must have a charging negetive on the battery, bypassing the shunt.

ALL negetives must go to shunt. Only wire to battery negetive must be from shunt.

cottersay 06-20-2021 06:48 PM

1 Attachment(s)
Hi twinboat,

I have the setup exactly like this, with the negative out of the shunt going directly to chassis ground:

https://community.victronenergy.com/...1221133007.png

twinboat 06-20-2021 07:22 PM

And there are no other wires going to the battery negetive posts ?

cottersay 06-20-2021 09:34 PM

No, not a one...

twinboat 06-21-2021 06:19 AM

When you unplug from shore power are the batteries low ?

How are you charging them ?

Persistent 06-21-2021 07:29 AM

It is possible that the Victron unit is defective or needs a setting change.

Other than that, you could post pictures of the battery bank wiring and shunt wiring.

How do you mean, the Victron works OK when boondocking?
Do you charge using a built in generator or a portable generator or solar?
Do you charge multiple times while boondocking?
Do you reset the Victron to 100% when you start boondocking?
Do you charge from your engine alternator? How well does that work?

GPCPL 06-21-2021 11:48 AM

Check that all your settings are correct for your particular setup,and clear the history. A couple of years ago, I had done some work on my battery setup, and wound up getting some strange feedback from my BMV 712. I don't remember the details, but I double checked my settings and cleared my history, and its been good ever since.

cottersay 06-21-2021 01:54 PM

2 Attachment(s)
Thanks, guys!

When I unplug from shore power the batteries are fully charged, even though SOC may read 13% or less.

When I charge the batteries while boondocking with my portable gas generator (floating ground), the 712 monitor has all of the correct readings. I have to charge the batts every day with the generator (at 10,000 feet the genny huffs and puffs inefficiently along). I manually reset the SOC to 100% after a full charge while boondocking. I also charge from my RAM’s alternator at that altitude, because the genny can give out and refuse to start. The RAM method is rather ineffective, but when you absolutely need to pull the awning and slide back in with dead batts, well…

I tried to clear the History on the app, but there is no longer a “clear history” selection under Miscellaneous.

Photo of my battery setup. Shunt is water sealed and hard to get to, but it has no other wires or loads attached to the terminals.

https://www.irv2.com/forums/attachme...1&d=1624305802

GPCPL 06-21-2021 05:06 PM

Clearing the history on the BMV 712is under 4.2-63 in the manual. Basically, on the meter, press SETUP button for two seconds to access the functions.
Press + or - to browse (#63 is CLEAR HISTORY).
When you get to the desired parameter (63), press SELECT.
Use the SELECT and the + and - buttons to customize. A short beep confirms the setting.
Press SETUP at any time to return to scrolling text, and press again to return to normal mode.
Thats out of the manual, and I hope it helps. I'm pretty sure the only way to clear the history on the 712 is at the monitor itself. Can't clear it from the phone app.

cottersay 06-21-2021 05:57 PM

Thanks GPCPL, that cleared the app's History!

GPCPL 06-21-2021 06:32 PM

Your batteries look fairly new. Did you recently replace them, and did you have the 712 with your old batteries?

cottersay 06-21-2021 09:33 PM

Both the BB batteries and the Victron monitor are only about two years old, so I never experienced the Victron with anything but the BattleBorns...

Persistent 06-22-2021 08:02 AM

Quote:

Originally Posted by cottersay (Post 5800460)
...

Photo of my battery setup. Shunt is water sealed and hard to get to, but it has no other wires or loads attached to the terminals.

https://www.irv2.com/forums/attachme...1&d=1624305802

The negative terminals of the battery are tied to the metal battery box. The wire marked "shunt" it wired to the metal battery box. This connection by passes the shunt to ground. This is why charging is not registered on the Victron.

The wire from the negative terminals of the batteries must go directly to the shunt. It must not "pass go" or connect to anything else.

Get a new battery cable long enough to reach the shunt without connecting to the battery box.

You may need to connect the "house" side of the shunt to ground if it is not already grounded. The ground wire needs to be a big as the battery connecting wires.

I wish you good luck and happy trails ahead!:thumb:

cottersay 06-22-2021 09:49 AM

Thanks Persistent, but what looks like a ground to the battery box is actually a floating spst battery switch. I should have marked it in the photo!

chuckbear 06-22-2021 10:27 AM

Did you go through the proper setup when you connected to these batteries? The 712 is not plug-and-play. You must set the proper parameters for the batteries or the readings are never going to be correct. The instructions are in the manual. Chuck

cottersay 06-22-2021 11:35 AM

Thanks chuckbear, but I set it up exactly as specified for BattleBorn lithium batteries.

chuckbear 06-22-2021 11:57 AM

Quote:

Originally Posted by cottersay (Post 5801565)
Thanks chuckbear, but I set it up exactly as specified for BattleBorn lithium batteries.

Then you might want to refresh those settings. Then make a call to Victron tech service. They are very helpful. Chuck

SV K 06-22-2021 12:28 PM

If your SOC reading is dropping under charging over the course of a couple weeks or so even though you know the batts are full it may be that the "Efficiency" setting is at the factory setting of 95% which is for lead/acids. Victron advises setting it to 99% for Lifepo4's.

cottersay 06-22-2021 08:30 PM

Thanks SVK, but I have my Efficiency setting at 99%.

cottersay 06-22-2021 08:34 PM

chuckbear hit the nail on the head; all I needed was to "refresh" the BMV's settings -- a full factory reset. After the reset, I then entered all of the proper Lithium parameters, and so far so good.
Thanks chuckbear and company!

Kayakist 06-23-2021 06:38 AM

Following
 
I've been following this thread very closely as I want to add a battery monitor to my class A.


I'm leaning towards the 712 as it seems to be the best performing one on the market. I was considering the smart shunt but the shorter wifi capability has me concerned as my batteries are under my metal enclosed entrance steps.


I'm electrically challenged so tackling the install is a bit concerning. It's great to know that I can reach out to folks like you if I run into problems.

GPCPL 06-23-2021 07:55 AM

Quote:

Originally Posted by Kayakist (Post 5802596)
I've been following this thread very closely as I want to add a battery monitor to my class A.


I'm leaning towards the 712 as it seems to be the best performing one on the market. I was considering the smart shunt but the shorter wifi capability has me concerned as my batteries are under my metal enclosed entrance steps.


I'm electrically challenged so tackling the install is a bit concerning. It's i great to know that I can reach out to folks like you if I run into problems.

The install on the 712 is pretty simple and it comes with instructions. FWIW, I think it's a great monitor and I've been happy with mine. The hardest part is reading the manual and setting the parameters, but its all covered in the manual. Good luck, and thank you for your service.

chuckbear 06-23-2021 10:21 AM

We have had the Victron monitor on the RV for over 4 years and one on our boat for 15 years. Best investment we ever made. Chuck

cottersay 06-23-2021 12:34 PM

The battery monitor is an absolute must if you boondock, as you'll be surprised (more like shocked) at how quickly even Lithium's are depleted, leaving you with your pants down. (Like I was at 10,000 feet, just when you need to bring in your slideout, awning, and use the front jack to leave, but you discover that your batteries are dead and your generator won't run at that altitude.)

treeoflib 06-26-2021 10:39 AM

Quote:

Originally Posted by cottersay (Post 5803093)
The battery monitor is an absolute must if you boondock, as you'll be surprised (more like shocked) at how quickly even Lithium's are depleted, leaving you with your pants down. (Like I was at 10,000 feet, just when you need to bring in your slideout, awning, and use the front jack to leave, but you discover that your batteries are dead and your generator won't run at that altitude.)

And adding insult to injury, your pants were down. I risk hijacking a thread, but the OP got it figured out. How did you fix this?

I love camping above 10,000 feet. Food tastes better and the thinner air is still so invigorating.

cottersay 06-26-2021 03:16 PM

Yes, I even had a high-altitude jet kit in the generator's carburetor, but it wasn't high-altitudey enough (max 6000 feet). I have now ordered a higher altitude kit, but none of them are rated to go above 8000 feet, so we'll see...

treeoflib 06-27-2021 07:40 AM

Quote:

Originally Posted by cottersay (Post 5807518)
Yes, I even had a high-altitude jet kit in the generator's carburetor, but it wasn't high-altitudey enough (max 6000 feet). I have now ordered a higher altitude kit, but none of them are rated to go above 8000 feet, so we'll see...

Sorry, I was vague with my question. How did you get your batteries charged enough to get off the mountain on that fateful day?

cottersay 06-27-2021 02:42 PM

Mostly by using the emergency hand cranks. I first cranked in the huge slide, then slowly and exhaustingly cranked up and down (I have stabilizer bars) the front jack*, then I got lucky and the pull vehicle (RAM 1500 Hemi) supplied just enough oomph from its alternator to pull in the awning.

*FYI: Take off the hidden jack brake before trying to crank!


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