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Synchronizing Victron Components


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#1 Cpt Davenport

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Posted 01 December 2022 - 04:17 AM

Simply put, my Victron charge controller goes into float mode when smart shunt only reads 95%.  Even when there is  plenty of solar available to get me to 100%.  Shunt is set for lithium and 100% is set at 14.4v.  If shunt is set at 14.4 max, should I set float at 14.4 on CC?


Edited by Cpt Davenport, 01 December 2022 - 04:22 AM.

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#2 Vic Harder

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Posted 01 December 2022 - 05:05 AM

short answer, yes.  All your components should be set to the same values, which may not be the defaults.  Which Victron components do you have?


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#3 Cpt Davenport

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Posted 01 December 2022 - 05:22 AM

Thanks Vic.

 

Victron components are:

 

MPPT 100V 20 amp BT Charge controller

500 amp smart shunt

 

 

Battery: 206ah SOK lithium

Solar: 175w (roof mount) 135w (auxiliary folding panel)


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#4 Charlie

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Posted 01 December 2022 - 07:54 AM

Simply put, my Victron charge controller goes into float mode when smart shunt only reads 95%.  Even when there is  plenty of solar available to get me to 100%.  Shunt is set for lithium and 100% is set at 14.4v.  If shunt is set at 14.4 max, should I set float at 14.4 on CC?

Maybe I'm missing something here. My Victron shunt determines state-of-charge (SOC) based on amp-hour usage, compared to the battery ampacity that I specify. It doesn't use voltage as a measure of the SOC.

 

I don't think that the MPPT uses the SOC from the shunt to control the charge profile; I'm pretty sure that it guesses it from battery voltage. I recall bumping up the absorption voltage by a few tenths V on my MPPT in order to get it to put a little more charge into the battery. Unfortunately I can't look at my system right now to see my settings.


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#5 Cpt Davenport

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Posted 01 December 2022 - 02:15 PM

So Should I set the absorption on my CC to the same number as the 100% SOC on my shunt? 14.4v in this case.


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#6 Vic Harder

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Posted 01 December 2022 - 10:55 PM

So Should I set the absorption on my CC to the same number as the 100% SOC on my shunt? 14.4v in this case.

Yes.  I'll try and get pics of my settings in the next few days.  VERY cold out (0*F) at the moment.


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#7 Cpt Davenport

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Posted 02 December 2022 - 12:10 AM

Thanks,

 

BRRRRRRRRRRRRRRRR!!!!!! I thought low 30's was feeling cold!


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#8 Vic Harder

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Posted 02 December 2022 - 04:09 AM

On my Victron Charging devices (Orion and MPPT) absorb is set to 14.4, float to 13.4.

 

Shunt is set to 14.4 charged voltage, 2% tail current.

 

So yes, absorb and charged voltage should be the same.


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2015 Silverado 3500 crew cab 8' bed Diesel

2012 ATC Puma Shell build - https://www.wanderth...012-puma-build/

Power considerations thread - https://www.wanderth...e-power-scotty/

Building out an electrical system - So, you want to setup a good electrical system in your camper? - Electrical, Charging, Solar, Batteries and Generators - Wander the West


#9 Cpt Davenport

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Posted 02 December 2022 - 05:07 AM

 

On my Victron Charging devices (Orion and MPPT) absorb is set to 14.4, float to 13.4.

 

Shunt is set to 14.4 charged voltage, 2% tail current.

 

So yes, absorb and charged voltage should be the same.

 

 

 

Perfect, done! Muchas Gracias! I cant wait to test it the next time the sun comes out! Gotta make hay (or watts) when the sun's shine'n and getting topped off to 100% SOC is always nice when mother nature is picking up the tab.


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#10 Cpt Davenport

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Posted 03 December 2022 - 01:05 AM

Synchronized absorption volts on CC to 100% SOC volts on shunt and got a couple hours of sun on it. Fully charging now! 100% is better than 95%. 


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