question

Hi! The smart shunt counts the consumed Ah and gives you an estimation of the SOC. The real SOC can never be precisely measured. Discharging 10Ah with 100 Amps is very different from Discharging 10Ah with 5 Amps. So the shunt starts calculating the Ahs you give back to the battery, but if certain parametets are reached (voltage, tail current and time) it jumps to 100%.

Hello,

Thanks for the answer.

I understand that it can't be measured very precisely. But still it should not jump back to 100% if there is only small charging.

For example: I leave the battery at night with around 60% capacity (shown by the smart shunt). When I check the shunt the next morning it is back at 100%, although it only charged a little bit from solar (probably maximum 5Ah).

The MPPT charger sets the voltage to the charge voltage of the battery, but that should not be concidered for the charge status of the battery. The current can be very low as the solar doesn't produce much energy right now (only 400Wp attached and winter), but it doesn't mean, that the battery is fully charged. When I attach my DC-DC charger, it charges the battery with 30 amp.

From my understanding the shunt should count the amps charged the same way it counts the amps discharged and not jumping back to 100% as soon as the battery is charged slightly.

I bought the smart to have control over my battery charge state and the used/charged Ah. If it behaves like this and stays nearly always at 100% regardless the real state.