Hello, I have a SmartShunt 300 running for 3 days. Currently still without a controlling function, but only for visualization.
The RN150 BMS of my GobelPower 16s / 280 A battery is currently still doing both the battery monitor and the controlling BMS via CAN.
Current SmartShunt settings:
Battery capacity 280 Ah
Charging voltage 55.2 V
Tail current 1.00 %
Time for state of charge detection 5 min
I don’t understand why the SmartShunt goes to 100% SOC so early with these settings. According to the settings, this should only happen if the voltage is above 55.2 V for at least 5 minutes and the current is below 0.01 * 280 = 2.8 A.
However, the shunt actually switched to 100% at 54.37 V and 14.90 A.
I have to say that I have changed one setting or another every day during the day (Peukert exp., tail current, charging voltage), but always several hours before reaching 100%. Does the shunt have to run longer without changing the settings before it works correctly, or have I set something wrong?
There are 2 ways for the shunt to get to 100%. The first is that it counts the energy going back into the battery and it can get to 100%. That is how yours has worked. If the settings are perfect then it reaches 100% at the same time as the charged voltage and tail current are met. If not, it can happen a bit earlier.
The second, is if the battery gets to full (voltage above charged voltage setting and current below tail current setting) while the SOC is below, 100% the SOC then automatically jumps to 100%. Here is an image of a synchronisation to 100%, these batteries had not synchronised for 40 days and had an error of 0.1% per day so were reading 96% when the charged voltage and tail current matched.
Image failed to upload, see next reply.
If you adjust Peukert or charge efficiency they have an impact on the whole history back to the previous 100% state.
Your settings look OK, leave them alone now and see how you get on over 2 days without making any changes. If they get to 100% too early then reduce the charge efficiency to 98%.
