The minimum AC input current for a Quattro 48V/10k (2653) is 10,5A.
We’ve configured two Quattros in parallel.
Ekrano GX is the controling device.
Weak AC is not activated.
We are temporarily in the situation of having to set 16A max. AC input.
During this special period we do not need to run both Quattros. We definitely need the Power Assist function. We need it with the full power of one Quattro.
I understand that two AC inputs of 10.5A each are required for parallel operation. The minimum we’re able to set is 20,8A. Consequently, we must deactivate the slave temporarily and on demand.
When the slave Quattro is switched off using the front panel switch, the “On” option for normal operation is unavailable on the master; only “Inverter” is available.
This situation will occur from time to time in the future.
What is the solution for temporarily operating only one Quattro without a PC, MK3, or VE.Configure?
None, thats not what a parallel system is intended to do.
If you want to run an inverter in standalone mode, you would need to reconfigure it to standalone mode.
I believe this can be prepared, so a config file for parallel and a second one for standalone. But you need to upload somehow, either by being physically connected to the unit or trough VRM
But if i understand the situation correctly, you can set the parallel config to not switch together and then only use the ACin of one Quattro while the other is just idle
You can try overide the input via the GX and the input current limit.
But, no, you can’t run just 1 inverter, unless you can electrically isolate the spare system and have reprogrammed the remaining one as standalone.
All documented in the manuals.
We need to run air-conditioning which takes approx 25A plus 5-10A for other stuff.
The temporary AC input is limited to 16A.
The LiFePo4-battery bank is sized to deliver enough power for up to one week under those conditions.
Power Assist is essential and one of the reasons for having Quattro’s installed.
It looks like having two config files ready to upload via VRM might be the solution.One for paralleling, one four solo.
I just don’t know whether a electric separation of the Quattro’s is necessary or it’ll be done by deactivating the 2nd unit via GX or switch.
There are choices for supplying loads besides power assist when grid attached.
You said you had a temporary issue, I offered a temporary solution.
As long as power assist is enabled you have a higher minimum current limit.
Thats the trade off.
You need to electrically separate systems when switching between configs. My own parallel system is built this way so I can reprogram for a failure.
AC IN and OUT should be isolated (assuming loads on AC OUT).
Parallel inverters should also be individually fused to the DC bus, and I would pull those when reconfiguring in standalone so the inverter is completely disconnected.
Let me summarise:
Each Quattro must have its own breaker for AC1 input and a breaker for AC1 output.
On the DC side, each Quattro already has its own mega fuse on the Lynx distributor.
Question here: do I really have to disconnect the DC connection of the unused Quattro in single mode?
Then I create two configurations, one for parallel operation (which is already running) and one for each quattro for single operation. I upload these configurations via VRM as required.
Apart from solving the current AC input limit problem, this allows me to operate two Quattro’s alternately and individually, which was actually the safety strategy.
So far so clear. In conclusion, I am still puzzled about the necessity of the depth of the intervention: from my point of view, it should be possible to simply switch off the slave Quattro via the GX and the master Quattro should continue to work independently in single mode.
An error message to be confirmed on the GX as an indication would be sufficient.
Having the same issue on our ship with two Quattro 48/5000. Oftentimes shore power in Harbours is limited to 10 or even 8 amps. Currently in such a Harbour and now I cannot charge my batteries because I cannot set a low enough current limit.
I would like to understand what’s the reason for a high minimum amperage. I mean, even if only 5-8 amps AC comes from shore, PowerAssist should be possible without restriction. Especially when, as in our case, 1,200A DC with 51.2V is available.
We were quite surprised to discover this limitation on our ship. Fortunately, we have installed two additional Multi RS 6000 units with different switching options for integration – but even here, we are struggling with the fact that the two Multi RS units still do not allow parallel operation. Not to mention that they require at least 120V solar voltage, which we don’t have and don’t want.
I repeat, the smarter, more modern RS devices do not allow parallel connection at all!
The really great thing is that these kinds of hidden restrictions (minimum amperage) were not apparent to us in any manual, video or installer.
What makes me feel positive is that the ability to disconnect parallel Quattros at any time means a safety gain, even if we have to fundamentally change/expand the installation again to do so.
