Why would my lithium-smart shunt-colorGX be saying 78% at only 12.2v this early morning.
I've been stationary for three weeks relying on only moderate solar. By mid morning its usually back up to 100%-13.2v. Do I just need to take the rig for a drive, giving the system a 'cook' at 14.4v to reset it all?
12.2V is almost empty.
Charging to 13.2V is not 100%.
Exactly! 12.2v is 10-15% - why would the shunt/GX be saying 78%?!
Post the charger settings and the SmartShunt settings.
Smart Shunt...
13.2v (battery manufacturer rested recommendation)
Snapshot, currently...
13.3v, SOC 100%, +5.27A
Smart Solar settings
Bulk-absorb 14.4v
Float 13.3v
Snapshot of battery bank, currently... Bulk state
For the MPPT:
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Your Absorption voltage set to 14.4V is the absolute maximum you should use.
That LiFePO4 battery has a BMS?
Can you read or measure cell voltages?
Depending on these answers, a lower Absorption voltage might be better (safer).
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Float - try 13.4V
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Depending on battery capacity and the MPPT & PV array you have, it might be needed to limit the charging current. But you gave no data.
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For the SmartShunt:
Set "Charged voltage" 0.1V - 0.2V lower than absorption voltage from the MPPT.
Tail current - try in this range: 3.5% - 5% (make sure the battery capacity is set correctly).
Charged detection time: 5 minutes
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Never discharge the battery below 12V.
Never discharge any LiFePO4 cell below 3V.
Batteries are 4x 100ah with internal BMS. From memory, I think I put the absorb at 14.4 as there was no setting to define the bulk voltage - this may have been the recommendation by the battery manufacturer (KS Energy), it's been some time now I can't remember.
Here's the settings I currently have...
Your "Charged voltage" from the SmartShunt (13.2V) was/is too low.
In the MPPT:
Just to be extra safe, set equalization duration to 0h0m. Equalization is disabled and equalization current is 0%, so this is a third safety measure.
The Absorption duration of 2 hours might be too short.
What's the total PV power?
Battery specs...
