I just want to confirm whether this expected behavior is normal: Is the Multiplus-II continuously powered by its batteries even when the grid is available? This is causing over 5% battery loss per day.
It always needs a bit of energy to be on.
The GX device also need a few W.
sure, but for what reason not taking it from grid as it does while disconnecting battery and switch to battery if grid fails?
I’m glad when the power consumption is drawn from the battery.
That’s what it’s for. I can set the minimum state of charge (SoC).
Its a battery based system, not grid based, its constantly monitoring grid and keep in sync with it
This is 120 Wh per day. If that’s a significant loss for you, then you definitely haven’t installed enough solar panels, and your 2.4 kWh battery is also far too small.
I assume this is a mobile system in a camper van or boat. Is this about winter storage? Even then, 120 Wh of loss per day is actually extremely low. Nevertheless, it’s better to draw power from the battery than from the grid.
The solution is to set the minimum SOC to, for example, 50% and then recharge the battery from the mains, preferably with very low power.
11 W Ă— 24 h equals 264 Wh per day, which is more than double your expectation. That means a 5 kWh battery will reach 20% state of charge in about 15 days.
The minimum SOC setting does not affect this behavior. Minimum SOC is intended to prevent the inverter from starting to invert, but it does not change the MP2’s power draw.
The MP2 draws power from the battery even when solar is available (unless solar generation exceeds grid consumption/charging). This is the most expensive way to power the MP2, since it significantly reduces battery life.
You asked at the beginning if it was normal. It is.
If you don’t like it that way, you can set the minimum SoC to 90-95% or configure the Cerbo to keep the batteries charged.
Yes normal.
At design stage all loads including self consumption / zero load consumption of equipment should of been considered. Self consumption / zero loads is clearly indicated on all victron spec sheets.
This being more important on small systems.
I’m afraid you’ll need to put this down to a learning experience and or work around it / redesign with this newly learnt information.
oooops 
I have no idea how this could happen. Perhaps the “5” from your reference to “5%” somehow managed to get stuck in the wrong place in my brain.
I suggested this method via the SOC as a workaround. If your system reaches the minimum SOC and you have enabled charging from the mains, the battery will be recharged, preventing it from becoming too deeply discharged through constant battery drain.
The battery loss seems normal or actually pretty low. From looking at the Cerbo GX diagram, it doesn’t appear that the inverter/charger is actually charging the battery bank. Is there a setting in the inverter/charger that might be off?
The MP2’s power draw and my battery system aren’t reflected in the built‑in readouts, so the system appears to consume almost nothing even though it does. By adding a more accurate dedicated measurement device (SmartShunt) you can see the real current flow and SOC, confirming that the MP2 is indeed drawing power from the battery.
Again, adjusting the minimum‑SOC threshold only changes when the charger kicks in; it doesn’t reduce the amount of energy the MP2 uses from the battery, so it does not impact or extend the battery’s cycle life or affect energy‑losses.
Compared to my Sigenergy system - Victron systems are incredible low power consumption devices. I regret not putting Victron in our house.
Each Sig Battery: 24 watt continuously - for an 8kWh battery that is 576 Wh/day = 7.2% self drain per day. (This excludes battery heating)
SigEnergy 10kW 3 Phase Inverter : 88 watt continuously (so equal to 3x 3.33 kW Victron Inverters) - so that is 2112 Wh/day.
So price yourself lucky with the low drain on Victron…
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Look the inverter needs power to run the gx device needs power and where ist the problem.
And when the gx ist powered by grid whats is if the grid lost the connection ? Right no gx device avaible. So its better to use the battery to feed the gx device.
No. In practice you use capacitors as a brief buffer to keep the GX from shutting down the instant the grid fails, giving the battery time to take over.
If you had no capacitors, the system would still experience an immediate power loss when the batter disconnects, even though the power is present. As of now as long as any power source remains connected the GX will continue to run.
It appears that the GX can be powered from the mains today without any hardware modifications / impact, but can’t be configured.