Victron smart shunt settings

[wp1234]

Good morning all ,
Just hoping someone can confirm that I have settings right on my recently installed Victron Smart Shunt. I have two new 110Ah Victron Gel batteries for leisure use I assume that battery capacity should be set at 50% of the 220Ah total I.e 110Ah which is the max discharge level.Should the discharge floor then be set at 0%?
Thanks in advance .

 

[Lenny HB]

The battery capacity should be 220ah then reduce it annually by 2.5% for aging.
Set charge voltage to 14.1v.
Peukert exponent to 1.1, increase to 1.25 as the batteries get older.
Charge efficiency 85%.
Discharge floor 25%
Tail current 2%

Thats a good start you may need to tweak the settings a bit to get an accurate percentage reading.
You need to run the batteries down below 80% and recharge a few times to get it synced up.

 

[Raul]

All the above, just make sure your charger is set the same as the charged voltage, 0,1v higher on the charger than bmv setting.

 

[steveh57]

Just trying to clarify for my own use. I quote from the smartshunt manual "The charged voltage” parameter should be set to 0.2V or 0.3V below the float voltage of the charger." I have lithium batteries which I float at 13.4V it looks like I may have set the charged voltage wrong??? it's currently at 13.9V i.e 0.3V less than the absorption voltage of 14.2V

 

[steveh57]

Just trying to clarify for my own use. I quote from the smartshunt manual "The charged voltage” parameter should be set to 0.2V or 0.3V below the float voltage of the charger." I have lithium batteries which I float at 13.4V it looks like I may have set the charged voltage wrong??? it's currently at 13.9V i.e 0.3V less than the absorption voltage of 14.2V

I believe I have the answer- it depends on the primary method of charging, so for Solar with a variable charging current my settings are ok i.e 0.2 to 0.3V less than the set Absorption voltage

Instructional video: How to optimise the BMV-700 series sync parameters - Victron Energy

Does your BMV state of charge (SOC) synchronise too early or not detect a full charge? If so it is worth noting there are various settings for differing batteries and systems, to ensure your BMV works correctly. The default setup and settings are applicable for most situations, however the...

www.victronenergy.com

Time = 3mins :13secs

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[wp1234]

The battery capacity should be 220ah then reduce it annually by 2.5% for aging.
Set charge voltage to 14.1v.
Peukert exponent to 1.1, increase to 1.25 as the batteries get older.
Charge efficiency 85%.
Discharge floor 25%
Tail current 2%

Thats a good start you may need to tweak the settings a bit to get an accurate percentage reading.
You need to run the batteries down below 80% and recharge a few times to get it synced up.

Thanks Lenny but the problem with setting it at 220Ah is that the screen will show

The battery capacity should be 220ah then reduce it annually by 2.5% for aging.
Set charge voltage to 14.1v.
Peukert exponent to 1.1, increase to 1.25 as the batteries get older.
Charge efficiency 85%.
Discharge floor 25%
Tail current 2%

Thats a good start you may need to tweak the settings a bit to get an accurate percentage reading.
You need to run the batteries down below 80% and recharge a few times to get it synced up.

Thanks Lenny much appreciated as always .
I had it set at 220 to begin with but as you can see the state of charge then reads as 71% of 220 with 86ah used, I think I’m right in saying that I shouldn’t discharge the battery bank beyond 110 Ah so is really the state of charge overstated and I should only take the batteries to 50% max .
Hope this makes sense .

 

[Lenny HB]

220 ah is correct as it's the size of the battery bank it needs to know for the calculations.
Gels you can take down to 20% regularly and still have a long life, that's why I put the discharge floor at 25%. You won't do it very often anyway. I've only got that low once in the last 4 years we couldn't move due circumstances beyond my control.

The reason it's not reading right is because the settings aren't correct, the setting I gave is what I found gave me accurate % readings after playing with my setting for a week or two.
You are showing 71% when it's actually 61% which is often the case when set incorrectly.
Once you have changed the setting you need to put it on charge for at least 24 hours, then discharge to below 80%, then recharge for 24 hours, repeat this cycle 4 or 5 times them it should read correctly.

Its not critical the % is correct as you can always work it out from the current consumed.

Also the voltage is showing 11.69 off load its probably around 11.9 which is about 20%, may the current readings don't tie up as with your settings its syncing before the batteries are fully charged.
With the batteries that low after changing the setting I would give the first charge 48 hours.

 

[wp1234]

220 ah is correct as it's the size of the battery bank it needs to know for the calculations.
Gels you can take down to 20% regularly and still have a long life, that's why I put the discharge floor at 25%. You won't do it very often anyway. I've only got that low once in the last 4 years we couldn't move due circumstances beyond my control.

The reason it's not reading right is because the settings aren't correct, the setting I gave is what I found gave me accurate % readings after playing with my setting for a week or two.
You are showing 71% when it's actually 61% which is often the case when set incorrectly.
Once you have changed the setting you need to put it on charge for at least 24 hours, then discharge to below 80%, then recharge for 24 hours, repeat this cycle 4 or 5 times them it should read correctly.

Its not critical the % is correct as you can always work it out from the current consumed.

Also the voltage is showing 11.69 off load its probably around 11.9 which is about 20%, may the current readings don't tie up as with your settings its syncing before the batteries are fully charged.
With the batteries that low after changing the setting I would give the first charge 48 hours.

Fantastic reply , I never knew that you could take GELs down that low will play around with it for the next few days cheers

 

[Raul]

Thanks Lenny but the problem with setting it at 220Ah is that the screen will show

Thanks Lenny much appreciated as always .
I had it set at 220 to begin with but as you can see the state of charge then reads as 71% of 220 with 86ah used, I think I’m right in saying that I shouldn’t discharge the battery bank beyond 110 Ah so is really the state of charge overstated and I should only take the batteries to 50% max .
Hope this makes sense .

You will need to keep a eye on after a new resynq. As you changed settings, it will need to do another cycle to full to have a reference to do the new calcs based on new settings.

 

[Raul]

I believe I have the answer- it depends on the primary method of charging, so for Solar with a variable charging current my settings are ok i.e 0.2 to 0.3V less than the set Absorption voltage

Instructional video: How to optimise the BMV-700 series sync parameters - Victron Energy

Does your BMV state of charge (SOC) synchronise too early or not detect a full charge? If so it is worth noting there are various settings for differing batteries and systems, to ensure your BMV works correctly. The default setup and settings are applicable for most situations, however the...

www.victronenergy.com

Time = 3mins :13secs

I fond 0,1v under the absorb, is more that enough to reset to 100%. When I absorb at 14,2v I set bmv charged voltage to 14,1v. The reason is transient variable power from solar. It can reset prematurely, and yes having more than one source, you need to follow the primary main charging one. In my case, the ehu and solar are in sync, the B2B is on different values. But that’s ok as it’s not primary source, and I never absorb on B2B, just a top up.
The values given in manual work ok on fixed installation where more power is available, even then needs tweaking as all systems differ.

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[Sheddy]

Having just installed a victron smart shunt and before getting involved with the settings, I would like to confirm my Victron solar controller settings are correct.
The system is primarily solar charged and has 2 x 130ah Hankook sealed lead acid batteries. The controller is the Victron 75/15 with Bluetooth dongle.
These are the current settings any advice will be helpful.
Thanks
Ed