Recommended Fogstar / Victron Shunt settings just received.

[Jev88]

For reference I have a Fogstar Drift with Bluetooth and a Victron Smart shunt I have just added

Might be useful to others searching.

 

[AdrianChen]

Mine are set in line with Victrons advice.

Several on here have their chargers set to an absorption of 14.2v, so setting the shunt to 14.4v may not be correct. I think Victron advise 0.2v below the absorption value.

Battery SOC on reset on mine is set to Keep SOC, since the couple of resets have happened when the batteries were not 100%.

Others are close but not the same

But these only effect the shunts displayed values, so in no way will it alter the charging, so I'm sure I'm not harming the batteries.

However when I look at the graphs showing SOC and the actual voltage/amps at the battery, it is very accurate.

 

[Lenny HB]

Here are my settings and results are spot on.

 

[Guigsy]

What are the matching settings for the chargers? The default LiFePO4 profile on my SmartSolar seems to be a bit reluctant to fully charge the battery.

 

[Lenny HB]

What are the matching settings for the chargers? The default LiFePO4 profile on my SmartSolar seems to be a bit reluctant to fully charge the battery.

Mine are set to 14.25v Absorption & 13.5v Float.

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[Raul]

What are the matching settings for the chargers? The default LiFePO4 profile on my SmartSolar seems to be a bit reluctant to fully charge the battery.

If you have the default settings for lifepo4 , its not the settings or the charger, it's insufficient the panel for the discharge you do.
To confirm this, measure voltage on the battery terminals and compare the voltage given by the smart solar in the app. This preferably when near full. If voltage at terminals are slight lower than charger voltage, it may be voltage drop taxing you as well.

 

[Guigsy]

If you have the default settings for lifepo4 , its not the settings or the charger, it's insufficient the panel for the discharge you do.
To confirm this, measure voltage on the battery terminals and compare the voltage given by the smart solar in the app. This preferably when near full. If voltage at terminals are slight lower than charger voltage, it may be voltage drop taxing you as well.

I'm using a Victron shunt with the Bluetooth networking feature, so it knows the voltage at the other end, right?

 

[Raul]

I'm using a Victron shunt with the Bluetooth networking feature, so it knows the voltage at the other end, right?

At the shunt yes, but from the shunt to battery?

 

[AdrianChen]

I'm using a Victron shunt with the Bluetooth networking feature, so it knows the voltage at the other end, right?

Yes if you have set up a smart network with the smart shunt and all your Victron chargers, then the shunt will be sharing the voltage and if you have a temp sensor also the battery temperature.

That means the chargers will compensate for any volt drop (up to their maximum), and use the temp data if you have set say low temp protection or with lead acid temperature compensation.

 

[JockandRita]

Here are my settings and results are spot on.

View attachment 1036274

Jev88. Ours are very much the same, as advised by Raul.

Cheers,

Jock.

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[MichaelT]

This is mine, think it may be the default as I have 2 different makes and capacity of batteries

 

[MichaelT]

Here are my settings and results are spot on.

View attachment 1036274

Have you set your capacity to the fully charged value or actual value? I have mine at actual values (200+280) but I know they go to 510 when full.

 

[Lenny HB]

Have you set your capacity to the fully charged value or actual value? I have mine at actual values (200+280) but I know they go to 510 when full.

Fully charged value, they are 2x230Ah & I have it set to 485Ah. Percentage SOC on the shunt agrees with current used within 1%.

 

[Raul]

Fully charged value, they are 2x230Ah & I have it set to 485Ah. Percentage SOC on the shunt agrees with current used within 1%.

You can correct that by adjusting Peukert exponent value, until percentage of SOC is 100% accurate.
How you do that? Note the %SOC and amps consumed out of full capacity, when battery is discharged 20% or lower.
For example a battery of discharged and 75% SOC remaing
500Ah - 25% = 375Ah + ( amps consumed declared by the shunt)
If the sum is higher than 500, reduce peukert value, and vice versa, until value rings true with 1-2Ah.

 

[Lenny HB]

You can correct that by adjusting Peukert exponent value, until percentage of SOC is 100% accurate.
How you do that? Note the %SOC and amps consumed out of full capacity, when battery is discharged 20% or lower.
For example a battery of discharged and 75% SOC remaing
500Ah - 25% = 375Ah + ( amps consumed declared by the shunt)
If the sum is higher than 500, reduce peukert value, and vice versa, until value rings true with 1-2Ah.

That's interesting thanks, it is so close not worth worrying about, well not until I've finished all the other mods.

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[Raul]

That's interesting thanks, it is so close not worth worrying about, well not until I've finished all the other mods.

I agree, the 1.02-1.03 both works well, very little difference in SOC %.

 

[pjay]

I think mine were set according to OffGrids video......

 

[JockandRita]

As Raul will confirm, just weeks after installation, I received notifications of updates to the Victron equipment installed, so naturally I let them go ahead, which changed certain settings, and only with Raul's help via screen shots was I able to revert back to his programmed user settings. I shan't be updating again in a hurry, and if I need to, I shall photograph all the user setting for each piece of kit first, to refer back to.

Last week upon installation of the Orion XS 50A unit, it updated itself before I could enter any user setting, so not a problem to adjust once it had finished updating.

Cheers,

Jock.