I have a smart shunt, regulating 2 x (rather old) LifePo4, which I monitor via Victron app. My problem is that even though my controller seems to be managing the battery charging regime quite well, and bringing the battery back to full, the app is not counting back up to 100%.
In other words:
Set Victron app to 100%
The battery is then partially depleted overnight
The DCDC charger then tops up the battery to 14.2V (0.2V below charged Voltage)
Your DC to DC charger charges at 14.2V. The charged voltage setting on the SmartShunt needs to be 0.2V below what you charge at to sync to 100%. Set it to 14.0V. If your charged voltage is 0.2V higher then it will never sync to 100% to clear the error. Some of your other figures may need adjusting, post a screenshot of the settings.
Thanks for that. I remember now, that I noticed a few weeks ago, that my app was jumping in the last few minutes of the charging cycle to 100%. Sometimes jumping from (say) 90% to 100%. I started fiddling with the settings.
My DCDC manual said ‘Charging Profile— Maximum Voltage 14.5’ so I set the App’s ‘Charged Voltage’ .3V below that.
Acting on your advice, I set my charged Voltage to 14V, and as you rightly said, I got my 100%, but it jumped again.
At the end of the day— or at the end of the night, really— I’m still managing quite well even though my batteries are now over five years old and partially cycled every night.
Here’s a screenshot:
Cant see anything that stands out too much, as said above a lower tail current may help but that depends on what your charger does when it stops absorption. If the voltage stays above 14.0V and the tail current goes lower than 5% then reduce the setting in the shunt.
