That’s what I thought,
So I think the solution is to suppress those warnings as described here by adding a 60 second time delay before they are activated - Overload L1 warnings for Furnace Blower start remedies - #10 by pwfarnell
That word associated with borrow is commonly used by spammers, so it’s on a list to automatically block.
I have made some significant changes to the system.
It has been about 3 weeks:
I) The system is significantly quiter than the single 8KVA (from experience I knew this would be the case)
II) The overload warning events are less. But alass the warnings are still there.
Next I will install a 10KVA Quatro to test with and see if the same events still occur
Incorrect, the manual does not say! It recommends
“To fully utilize the product’s capacity…Refer to the table below for sizing recommendations” https://www.victronenergy.com/upload/documents/MultiPlus-II_230V/32424-MultiPlus-II___Quattro-II-pdf-en.pdf
Victron further recommends a DC voltage loss below 2.5%
In actual fact the solar industry (incl. PV Green Card) rule of thumb is a voltage drop of 2% or lower for DC.
Victron’s toolkit:
At absolute max worst case load - 6M x 50mm2 @ 51VDC 180A(9.18KW) (more than any 5KVA MPII can produce) = 1.9% voltage drop. This is lower than Victron’s recommended maximum V drop.
If you care to read you will note that this is an ESS related issue. This only happens when ESS is enabled. This has been tested extensively.
Your original input was appreciated, but constantly trying to hammer on one specific point is not helpfull at all, but thanks for trying.
Hello @Anarchy2007
Could you please do something additional for those widgets that represent the power?
Please activate the Show range values, in order to have a much clear image about which was the max power.
See below what I mean:
The “VE.BUS” cables run in a sepperate conduit on the left which is blocked from view by the security gate. The cables you see are HDMi, CAT5 Internet Connection and Loose cables that were connected between IoT devices and the MPPT and their relays. ve/bus and BMS CAN cables in this installation are CAT6 FTP individually screened pairs.
Ground difference faults cannot be “seen”, neither are they caused by “unisolated” data bus cables. Ground difference faults (bad connetions, difference in cable lengths, etc…) can however cause high voltages and other issues on a data bus.
Hi @alexpescaru below is the data wit the changes as you requested from the same event as shown in the original gif image
Below is from the latest event
Latest Overload Warning at exact moment of Grid failure.
Values at grid fail:
AC-1-Out & AC-2-Out (at grid failure) = 800W approx
AC-IN (Measured at ET112) = -100W approx
AC-IN (Measured at Inverter) = -460W approx
AC Loads = 360W approx
PV Power = 3.1KW approx
Battery Power (Charging) = 2.1KW approx
TOTAL LOAD (at grid failure) = 1.3KW approx
TOTAL CHARGE = 2.1KW approx
For your information: I’m also seeing sporadic “Overload Warning” messages for the Multiplus-II 48/5000 in my PoC setup at home.
These typically come up when I plug in my electric motorbike (set to charge at 6A / 1.5kW so well within spec of the inverter) to the AC Out and automagically disappear after 20-23 seconds.
As this is my PoC setup, I never really bothered with them but now that I see your post I’m giving a “you are not alone” heads up.
Setup:
“If/when I have more time” I can pull more logs or upgrade my AC In cable but as stated: I’ve limited every part of the setup so that this cable shouldn’t pose a risk.
Victron staff, if you’re following: my installation ID is 169594.
3 posts were split to a new topic: Random overload warnings
Can happen from LOM detection.
Yup I do aggree. I’m still pretty convinced that the whole issue has to do with the long supply cable or grid supply related issue (ie something upstream from the inverter, even maybe the Et112 grid meter. this meter was replaced and no “overload warnings” yet, but has only been a week or so).
Overload Warning at power failure happens very seldom though. Maybe have had 3 of these at exact time of power outage in the past 2 years. Not so worried about this as it’s actually very little compared to the amount of power outages we have. (will get to it once I have the main issue resolved).
Thanks for that. I’m still leaning towards the grid supply / cable as the possible culprit. This seems to be the one thing we both have in common. There was a FW update to address this specific issue a while ago but did not work for me.
Please let me know if you ever do replace the supply cable and if it does resolve the warning issue?
Latest overload event
15:56:23 Overload Warning Event
15:59:50 Grid power failure
16:01:11 Grid power restored
It’s clear that again at 15:56:23 the Cerbo completely loses track of power distribution. All measurements are completely inaccurate / bizarre for a few seconds until “Overload Event” recovers.
I’m convinced, more than ever, that this is grid power quality / supply cable related. My issue is that apparently the LOM / Long supply cable issue had supposedly been resolved.
I honestly don’t know what else to do!!!
Unless you can get the grid connection changed, there is not much you can do
Is anything else happening at the same time such as frequency weirdness?
Have you tried power logging? Maybe there is harmonics or something we cant see with normal metering?
Is it faliure or rejection?
How far away is the ET from the inverter set up?
I do see it switch from discharging to external control. So it suggests a battery state switch as well. Are you set to feedback to grid at all?
“Is it faliure or rejection”
“How far away is the ET from the inverter set up?”
“I do see it switch from discharging to external control. So it suggests a battery state switch as well. Are you set to feedback to grid at all?”
I did have a scope on the grid supply, no the sine wave isn’t perfect (that’s supposed to be the inverter’s job to rectify the issues). But could never recreate an event while the scope was on. Originally the question was simply why would the inverter give overload warnings due to grid issues and how one can get rid of it. To date it has been difficult to find an answer, unfortunately.
As far as frequency shifts go, yes but very minor that I could detect. Around 1Hz max and it would go down 49Hz rather than increase above 50Hz.
No. It synchronises to grid. So it will try to follow what it is being supplied with.
Rectification of a sine wave requires it is able to form its own, which is what is does when inverting.
That’s what i meant. It should diconnect/reject the grid when there are issues (ie invert) rather than give an overload warning. Would make trouble shooting much easier.
That is what settings are for? Set tolerances so there is earlier rejection.
…in other words, set the grid settings (outside of the grid National Grid Code regulation) to the point that it stops giving “overload warnings” and completely disconnects from the grid???
That definetly does work seeing that “Overload Warnings” only happens with the GRID and ESS active/enabled. As mentioned before!
I know this because this was done!
Ah yes i forgot some people have grid codes.
My apologies.
Since we don’t we narrow the voltage cut offs higher and lower. Helps a lot with the overloads. We see the overload warning much more often under 200v here. So set the inverter does reject it earlier.
There is a set of circumstances that triggers the events, just need to figure out what they are. Remember impedence changes may be a part of it.
