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Old 01-10-2025, 10:27 AM   #1
MSL
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2019 22' Sport
Sharon , Massachusetts
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Need Help Understanding BMV-712

I recently installed a BMV-712. My system now includes an IP43 12/50(1+1), an Orion XS, and a SmartSolar MPPT75/15 along with two Lifeline AGMs and a single factory solar panel.

My question is why does the BMV show the batteries at 65% charge when the battery voltage (with only parasitic loads) is at 12.05 volts. I thought 50% was around 12.2 volts for a lead acid battery.

Also, while towing, will the batteries be charged by both the Orion XS (DC-DC charger) and the solar? Everything is in the same VE network.

Thanks in advance, Mark
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Old 01-10-2025, 09:27 PM   #2
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Are your batteries 100 amp hour each?
If they are only 80 AH each your BMV-712 is configured wrong.

How old are your batteries?
If your batteries are a few years old they may have lost some capacity. Also AGMs have less capacity in cold temps. What temp are the batteries at?

The batteries also need to be fully charged to sync at 100% charge(which can take more then 24 hours charging on shore power) before you can get an accurate reading..
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Old 01-11-2025, 09:03 AM   #3
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Wondering about Configuration

Quote:
Originally Posted by Wazbro View Post
Are your batteries 100 amp hour each?
If they are only 80 AH each your BMV-712 is configured wrong.

How old are your batteries?
If your batteries are a few years old they may have lost some capacity. Also AGMs have less capacity in cold temps. What temp are the batteries at?

The batteries also need to be fully charged to sync at 100% charge(which can take more then 24 hours charging on shore power) before you can get an accurate reading..
I was wondering about the configuration, but I think it's correct. Maybe sync? I did not do a manual sync; I just let it figure it out automatically. Photo of config is attached. Sorry, I should have included this with my original post.

I have two 80 Ah batteries, so I have capacity at 160Ah. Charged voltage is set to 13.2V. Battery temps are 20-30F and they're 5 years old.

Thanks, Mark
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Old 01-11-2025, 12:25 PM   #4
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And as you know you're all set up for lithium batteries which have gotten pretty cheap and there's a number of good options that fit the battery box up to 300Ah.

With our Victron shunt I gave up on the automatic reset settings. I found it will reset after an "event" which might not be valid unless you fuss with the settings and get them just right. I turn this option off and do a manual reset occasionally after being plugged in for an extended time. I have never tested the stated capacity of our 400Ah of batteries to see if they really hold 400Ah, but we have never played it that close to where we are less than 20% or so of assumed capacity.

With the XS and solar, yes they both should be charging. I have a similar setup and with the VE.Smart Networking turned on they play together (make sure it's turned on at each device).
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Old 01-11-2025, 04:27 PM   #5
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Quote:
Originally Posted by JeffKim View Post
And as you know you're all set up for lithium batteries which have gotten pretty cheap and there's a number of good options that fit the battery box up to 300Ah.

With our Victron shunt I gave up on the automatic reset settings. I found it will reset after an "event" which might not be valid unless you fuss with the settings and get them just right. I turn this option off and do a manual reset occasionally after being plugged in for an extended time. I have never tested the stated capacity of our 400Ah of batteries to see if they really hold 400Ah, but we have never played it that close to where we are less than 20% or so of assumed capacity.

With the XS and solar, yes they both should be charging. I have a similar setup and with the VE.Smart Networking turned on they play together (make sure it's turned on at each device).
Yes, I have two LiTime 100Ah batteries ready to get installed; that's why I installed all the new Victron devices. I wanted to make sure the Victron items were installed correctly, and I understood the various configurations, prior to installing the batteries.

When you say, "I gave up on the automatic reset settings", I assume you are referring to the synchronization. After reading your post, I did a manual synchronization, so I'll test the 50% SOC reading in several days when I have time to keep an eye on things.

Regarding the VE Smart Networking, yes, I have all devices set up and the system shows they're all online. Thanks for letting me know they do in fact work together.

Thanks again, Mark
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Old 01-11-2025, 05:39 PM   #6
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That seems strange, your first picture shows 81.8 Ah consumed and 65% charge. That would be close to 50% of 160 Ah.
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Old 01-11-2025, 06:34 PM   #7
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Quote:
Originally Posted by MSL View Post
I was wondering about the configuration, but I think it's correct. Maybe sync? I did not do a manual sync; I just let it figure it out automatically.
Below is a very good detailed post on setting up the BMV 712 that was posted the other day on another forum. The poster is a darn Victron guru and I always seem to learn something from his posts. This is good information for everyone as there are always questions on Victron shunts.

https://diysolarforum.com/threads/vi...-others.97606/
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Old 01-11-2025, 07:58 PM   #8
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Quote:
Originally Posted by Wazbro View Post
That seems strange, your first picture shows 81.8 Ah consumed and 65% charge. That would be close to 50% of 160 Ah.
Yes, that's why I created the original post; it didn't make sense to me.
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Old 01-11-2025, 10:45 PM   #9
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In order for the BMS to be accurate ALL the negative cables must route through the shunt. If you have anything routing to the battery bank's negative connection which bypasses the shunt you will get inaccurate and confusing readings.

Are you sure that all your negative cables are routed through the shunt?
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Old 01-12-2025, 09:47 AM   #10
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Quote:
Originally Posted by richard5933 View Post
In order for the BMS to be accurate ALL the negative cables must route through the shunt. If you have anything routing to the battery bank's negative connection which bypasses the shunt you will get inaccurate and confusing readings.

Are you sure that all your negative cables are routed through the shunt?
Yes, all loads go to the correct side of the shunt; only shunt connected to negative side of battery. Mark
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Old 01-12-2025, 09:49 AM   #11
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Quote:
Originally Posted by StogieMan View Post
Below is a very good detailed post on setting up the BMV 712 that was posted the other day on another forum. The poster is a darn Victron guru and I always seem to learn something from his posts. This is good information for everyone as there are always questions on Victron shunts.

https://diysolarforum.com/threads/vi...-others.97606/
Thanks. This is very informative, but I think I have everything configured correctly. I read thru the post, will do so again (and save it on my laptop).
Mark
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Old 01-13-2025, 11:50 AM   #12
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Quote:
Originally Posted by MSL View Post
Yes, I have two LiTime 100Ah batteries ready to get installed; that's why I installed all the new Victron devices. I wanted to make sure the Victron items were installed correctly, and I understood the various configurations, prior to installing the batteries.

When you say, "I gave up on the automatic reset settings", I assume you are referring to the synchronization. After reading your post, I did a manual synchronization, so I'll test the 50% SOC reading in several days when I have time to keep an eye on things.
Sounds good! I think it might be simpler having the lithiums, the charging profile is simpler and don't have to worry about discharge temperature, etc.

Yes, the synchronization is what I meant. It would explain why you were seeing higher charge percentage if it reset at some point automatically. I might still dink around with the settings and make it automatic, but after getting burned before, I trust the manual reset more. If it resyncs automatically and it's wrong then I'm out of luck until we get to a place I can plug in and charge them up fully so I know they're at 100%.
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Old 01-15-2025, 10:34 AM   #13
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Quote:
Originally Posted by JeffKim View Post
Sounds good! I think it might be simpler having the lithiums, the charging profile is simpler and don't have to worry about discharge temperature, etc.

Yes, the synchronization is what I meant. It would explain why you were seeing higher charge percentage if it reset at some point automatically. I might still dink around with the settings and make it automatic, but after getting burned before, I trust the manual reset more. If it resyncs automatically and it's wrong then I'm out of luck until we get to a place I can plug in and charge them up fully so I know they're at 100%.
Thanks again, Jeff. I'm glad I went with Victron for all this stuff, but there definitely is a learning curve.
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