Hi, I have a issue on one of my sites, we have 9 x 15Kva Quattro. The grid onsite is weak so we have setup the grid and Gen together on AC2 , with their own external Changeover between the 2.
We have 3 x Fronius eco 27 unis onsite connected to the AC out + DC mppt’s . This works fantastically until the battery needs some help. We have limited the grid to 20A AC per inverter, however this does not seem to work very well as we can see up to 200A Ac per phase with the internal dc charger set at 150/200 A. As the site is offgrid technically we only have the PV assistant installed . This works well. However now adding the Charge Current Control assistant solves the problem when the grid is on by reducing internal charger to 40A Dc per unit . It does not revert back once the Ac on ac input 2 is removed. This should work and i have it working on another site with an ESS assistant . Please can someone advise. Thanks Chris
This doesn’t make sense. Why?
You can only black start from ac 1 and you would be able to set two different input values for each source.
How do you have the charge current control programmed?
So we either use the Grid or the Generator, Original installation did not provide for a Dual supply from the Transformer and Generator.
I am aware you can only black start from ac 1 but that does not explain my question.
Yes to answer the question i needed to know how you implemented the current control.
You use ac2 and the assistant being a fairly dumb one, will adjust for differing as inputs or voltage control. But you don’t switch.
You need another way to implement the current control assistant.
Ok so am i missing something here, does the assistant not behave like the summary/Guide explains.
How else could this be implemented ?
Hi Chris.
What you’re missing is another Assistant to revert it. Try adding another (at the end will be ok) to set it to what you want if ACin2 is NOT active.
Thank you for adding this JohnC. Yes it needs to be told to revert back with a different condition.
Hi, That is what i thought as well but i can not find any way to do it . This is what it says in the Assistant setup. If there is another way please let me know.
Try adding another Charge Current Control Assistant.
Unfortunately when you do it only has the same options as the first one and none to revert to the original settings.
Ok, so I went for a closer look on a Multi. Seems that fixed option is a Quattro thing, only for ACIn2. And I suspect it would revert to the the 200A in VEConfig if ACIn1 came live (as Quattro is designed to do).
As a workaround, try adding this…
Note I’ve used Aux2 relay (use whatever you have spare, with no jumper across it), and the 70A you’d change to what you want.
It may not accept this with the original one in place, and if it doesn’t you could consider using it solely. With an externally controlled switch/relay set up on Aux2 to jumper it when you want the 200A back. A bit of mucking about, but all I can think of.
Hi,
The above does not really resolve the issue at hand. It makes it a manual switch. That is currently also achievable by re booting the system.
As the system is offgrid AC 1 and 2 are mostly not live and hence using the PV assistant.
I was hoping to get some clarity from Victron Technical support as to how this is supposed to be implemented.
Clarity is in the documentation.
It is basic programming like a PLC. Very simple. It needs and on and off condition. You have only given it an on condition. It will never switch off.
This logic is true for any assistant.
Generator start conditions
Generator stop conditions…
Even the PV assistant has a start and stop frequency.
If you are doing the size systems you have described, then the distributor or supplier should be assisting you. Victron does not do end user/installer support.
Hi,
Yes i am aware of that but if you add a sec0ond assistant you get this error.
The initial installer/Distributor could not get this right .
This is the error you get when you add the second assistant.
Huh. That is interesting.
Part of the issue is that you don’t switch sources. Which is more how it was designed to work. Its a legacy control item.
Have you looked at node red?
Or using the voltage control for the assistant? It is fairly easy with usb power and chargers these days.(With an opto isolator)
If overuled by remote has been checked then that may be part of it.
Does the generator/grid struggle? What exactly is the issue there?