I have two Quattro’s in parallel and I believe I have configured them properly.
While inverting the master’s inverting led is green, but the slave’s led is alternating between inverting and charging. Is that normal, or is it a sign of a communication issue?
Also while charging the slave does the same thing.
The lights won’t be the same as they are not in the same role.
If it is behaving like this then it is correct.
Yes, this is how it is behaving. Thanks a lot. It is comforting to know that is correctly configured.
One more question if I may. I configured both Quattro’s to limit AC-1 input to 63A and checked override by remote. Then in remote I selected the same 63A. When I then go back to the settings of the master Quattro is shows the limit to be 31.5A. I assume it makes sense since it splits it in half for each Quattro, also for as long as the “override” option is checked, I can not change the A setting. This also makes sense. But when I go to the settings of the slave a) it still says 63A (and not the half of it as the master) and allows me to change the setting even though the “override” option is checked.
My assumption is that the settings of the slave are not important and the whole system take the settings of the master, that’s why it is behaving like that.
Is my assumption correct?
Im a parallel set up it is the global limit for the phase, so yes divided over the two units
The slave follows the master. So its settings while good to have the same as the master are not used in normal operations. As yoj have already observed with the current limit.
What is important is that they both read and have the DC voltage the same. And have a balanced impedance in the ac circuit.
Thanks a lot.
I guess the fact that both are properly connected through VE.Bus to the Cerbo along with the lithium batteries BMS through VE.Csn assures that they read DC voltage the same. Proper cabling is also taken care of on the AC and DC sides.
While charging the picture is this.
a. it is never going above ~4.5 kw which is kind of low and
b. again while charging the AC loads jump to above ~1.0 Kw while there are almost no AC consumers on. If switch to inverter only mode without changing anything else the AC loads drop to ~0.3kw. What can explain this difference?
The picture in inverter only mode without changing anything else on the boat.
Almost 1kw in losses while charging? Is that normal?
If the parallel wiring is imbalanced then one inverter can put a load onto the other. This can also happen if there is a wiring loop.
It really does come down to the physical installation. They must be symmetrical.
Look at this topic Node red show parallel system stats
It has a flow to chart individual inverter performance for a parallel pair. Helps troubleshoot issues.
Parallel systems are an advanced config, not intended for beginners, as it is easy to get it wrong and end up with issues.
The installation was done by an experienced electrician, but I think he has made the mistake that you are describing.
What he has done is to connect the AC2-IN of the master to the shore breaker and then the AC2-IN of the slave to the AC2-IN of the master. Isn’t this the loop you are referring to? Is there a schematic of how it should be done properly?
In parallel, they both are connected with equal lengths and impedence to one source (if a quattro 2) and one/two load output. If they are not the same then one will do more work than the other or load the other.
I have seen a set up where there was a loop in the wiring where it was like a ring in the system that had an interesting effect.
The basic drawings are in the training manuals and require a bit of time to work through, but the system design should also be specific to your set up. There is free training on victron professional.as well.
OK thanks.
One more question. With two units in parallel (master/slave), if I switch off the slave manually the master will continue working?
If yes, since the VE.Bus cables go master→slave→Cerbo, if the slave in the middle is manually switched off will this affect the entire bus or the cerbo will continue seeing the master that is switched on?
Nope.
This is all in the docs and training.
They operate as one unit. If either fails then they all stop.
You are right.
Its good practice to wire them so they can be individually isolated.
That way you can reprogram them as standalone should a problem occur.
