Hi all.
Have noticed that sometimes after grid becomes poor the Quattro would not reconnect to grid even if it is within parameters.
Is there a retry count or has anyone noticed this? If I switch the inverter to Inverter Only mode and back to On, it starts to work.
Thank you.
You would need to look at the reason for grid rejection which is logged in the NS log on the veconfigure grid tab.
Grid code also has timeout windows iirc, maybe grid is fluctuating?
We are remote now so unable to connect with VE now. Yes, we know it is fluctuating. Thatâs a given here.
Understood. Any way to reset this state through NodeRed or other automation?
Probably. I have not tried.
My usual go to with unstable grid is to have an inverter to charge and the other one that remains inverting so there is clean power to consumers. (Or an AVR).
Try set the system to inverter only, then back to on.
That worked with the 3 retries of relay errors.
Yes, that works alright as I mentioned above but not ideal.
Remember the topic we had earlier this week, where the genset was on AC2 and Grid on AC1 and hence the generator would not be connected. Well now we swapped them arround (obviously in settings too).
Honest to God I start to lose faith in the Quattro and Q&AâŚ
Good afternoon,
I use a relay from the Cerbo to switch the grid on and off via the quattro.
Hard wired from the Cerbo to aux input master quattro.
In that case you can switch on/off de grid remotely through VRM, very handy.
Also on that input is a week timer, which will switch on at âlow priceâ grid times to charge only when 1 of my batteries is below 70%, and then charges only till 80% (3 BMV relays).
Our net is very unstable, but via the aux input, it always switches on the grid, I never had an issue (12 years now).
What you can try, is in bus config, to set the phases to float instead of fixed, or vise versa, try it, sometimes itâs only that setting.
Be aware to safe all single inverter data first, if you reconfigure bus.
Did you tick the wide input, e.g.187V-270V?
Phase rotation ok? Not the first who discovers that it was wrong for yearsâŚjust asking.
Regards, Jeroen.
Very interesting! Thanks Jeroen!
Would you mind give me a step by step on the aux input setup? Sounds like that is what we need here!
Yes, wide range is set and phase rotation is spot on - was measured with specialised equipment a few months ago when indeed the Quattro threw the usual âphase rotation wrongâ error. Turned out grid provider did not follow grid code colours at grid meter.
The input priority is documented, if the prioritised input has voltage the secondary wonât be used.
You need to choose which is most stable and manage that supply. An unstable grid is complicating things as that is usually stable when active.
Good afternoon,
You can use either output relay of the Cerbo.
Easiest is relay 1, set it to manual with console.
You connect only 2 wires, 1 to no, 1 to c.
These you connect in the master (behind the DC cabling) to aux in, doesnât matter which wire goes where.
In assistants, use general flag to switch on/off (ignore works the way around) the grid on AC in 1 or 2, pending your connection.
In assistants, use prog relay, and switch the general flag.
So, above are 4 assistants; ignore on means no grid, ignore off means grid on, aux input closed means grid on and aux input open means grid off.
In VRM you activate in controls the switch 1, in the top left corner you can switch it on/off, it takes 5 seconds, for if you made a mistake.
Ready to use.
Unfortunately I can not send you detailed pictures as Iâm on board a vessel with other brand inverters right now.
Regards, Jeroen.
Maybe I wasnât explicit enough. How it is now:
AC IN1 - Generator (50kva)
AC IN2 - Grid (unreliable source)
My problem is that it disconnects the grid after several low voltage fluctuations. The generator is started as per low SOC rule to start service the load but because meantime the voltage on Grid has stabilised it is never connecting the generator input. At least this is what I see from testing.
As per input priority with the generator running it should use it:
Note that we recommend wiring the Generator to AC-in 1, and the Grid to AC-in 2. The reason is that the Quattro will then prioritize the Generator over the Grid. That arrangement offers maximum flexibility (allowing forced generator intervention even when the grid is available) and maximises control.
You might try v555, it connects much faster ( after i turned off ups)
Ok, will upgrade to 555 once on site as I need to unplug the BMS and revert.
@nickdb - I know you are a Jedi of NodeRed. Could you guide me setup a flow which every 30 minutes sets the VE.Bus System Control to Inverter Only and back to On? Happy to send you a gift 
With this I could get it to run effortlesly - trying to learn now NodeRed on the go but customer doesnât have time for me to get to your levelâŚ
Here you go, try this. This flow will send a 2 every 30 minutes, wait for 30 seconds, then send a 3. You can adjust it how you need. I have a filter there so you donât need to continually write to the multi EEPROM and wear it out. Just connect your inverter mode switch position. I have left it off, this system is live and I donât want inverter only.
Flow code is in the text file.
SWITCH BETWEEN INVERTER AND ON.txt (4.5 KB)
Wrong aspectâŚthe system should reconnect, as it does very efficiently with v555, not be trying to work around a sympton that shouldnât exit in the first place.
You could always have a phase comparator on ac in 2 so it physically disconnects ac2 in, when it returns within acceptable parameters the inverter should try again.
Having a flow to keep retrying is not as simple as it sounds.
Unfortunately, it does not.
