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Have a couple of quattros with ESS Assistant. What it happens often is that when in sustain mode and receiving power from the mains the RCD trips quite often specially when using appliances as the washing machine, micro wave, dish washer.
The RCD is a Hager 2P 40A 300mA AC type.
Running latest firmware. 
It tripped again when no appliances were working
this only happens when Mains power is restored after Multiplus shuts down due to low battery voltage and with mains pass through.
it occurs when the VE.Bus System Automatic monitoring Low battery: Alarm is active
Type AC RCDs are prohibited in (AFAIK) all of Europe, because they don't respond well to imperfect sinus shapes. You could try replacing it with a type A RCD?
Or, it could be that your RCD is simply defective?
The RCDs are of type AC, two Hager CFC540A . Should be a type A instead for this type of installation ?
Any thoughts?
That 300mA is a RCCB (and not a RCBO), correct?
On the circuits connected to AC Out do you have any RCDs? Normally you should have 30mA (and maybe 10mA). If you do have them, those trip or not when the AC In RCD trips?
Also is this a new install or an older one which did not have this issue until now?
This is a new install and a RCCB used.
On the AC out there are extra RCCBs. Those are 30mA . The ones at the AC out are 300mA and trip, the others don't.
As I am using a transfer key once the RCD trips ( Hager CFC540A ) the key transfers to the grid and no RCCBs at the house installation trip. Only the ones at the AC out of the Quattros do.
For the AC1 out of the Quattros which type of RCCB should be used then ?
Also, I think your ESS system is not configured optimally.
You should avoid entering the Sustain mode. That is a "safety mode", not something you want to happen frequently.
The ESS should be configured such as the Minimum SOC is reached first (and then the loads are entirely powered by the grid, but without the battery being charged from the grid), so that your system never enters Sustain mode.
I have issues with Sustain mode. I try to reach 10% SoC, but sustain mode is entered around 12-13%. I tried to change the dynamic cut off and on another system I changed the sustain voltage settings. But it's still happening.
