Hello,
we are building boats with the same Victron System, but different behaviour. The system:
-24V AGM Battery (12 x 12V 200Ah Victron AGM Telecom Batteries)
-Victron Quattro 24/8000
-1000A Shunt BMV-712
-Cerbo GX
The Quattros are configured all the same. The Storage Mode is enabled (13,2V) this is the official value from Victron for this battery. On the most boats, this works perfect, the SOC stands still at 100% when the Quattro is in Storage Mode. On some other boats, with the same settings the SOC lowers to around 80%. See the attached picture.
I absolute dont get it. 8 from 10 boats are working fine in storage mode.
Does anyone have an idea how to fix this problem?
If the voltage is being held up at 26.4V AT the battery then the battery should not be discharging. However a large DC load can draw current from the battery, which at a low storage voltage would not recharge quickly.
The other conclusion is that on the boats that show a low SOC you have something incorrectly wired on the shunt so it is measuring a discharge when there is no load, or not measuring a charging current, or it has a zero error. Check all wiring is OK and do a zero current calibration.
Thanks for the quick answer.
On the boats that have not this issue, we can take around 2000W and the batteries will not discharge at all. On the other boats, we have all the time a discharge. The shunt is connected right (all Consumers at the Shunts load side) but the zero current calibration is a good think to do!
