Hi,
I want to install 3 Multi RS inverters in a 3 phase configuration. How does the system behave in case of a phase loss on the incomer?
Does the system assume loss of mains or can it still charge from the remaining phase(s)? I’m not interested in feed in.
With the Multiplies series, there was a switch as a group option.
I cannot see this in the documentation.
Any real world experience would be much appreciated.
Does anyone have experience with this?
Can this clarification be added to the documentation?
On the RS inverter, as documented in the manual:
Continue with missing phase: It is possible to configure the system so that if one unit is offline (for example due to it being physically switched off or a firmware update in case there is no grid connection to allow pass-thru), the other units can continue to operate and provide AC output power to their respective phases.
By default, the ‘continue with missing phase’ is disabled. Switching one unit off with the physical switch will make that unit switch off. If the unit is one of three units that are in three phase, then the others will also turn off as well.
If configured with ‘Continue with missing phase’ enabled, and minimum number of units is sufficient, then output to the other phases will continue even though its down to less phases than configured.
The ‘Continue with missing phase’ configuration option SHOULD NOT be enabled if there are specific three phase loads connected that require all three synchronised phases to operate (such as a three phase electric motor).
I interpret that as allowing the system to continue with one on the inverters out of commission.
My question relates to a phase loss of the grid, and all inverters are available.
Does the system wholly reject the grid, or does it synchronise with the remaining phases and fills in the missing one?
Traditionally, on the other systems, they switch as a group. I can’t find any reference to the RS being different. Will try get some clarity.
I suspected so.
In my neck of the woods, plenty of houses have a 3 phase supply installed. The vast majority of houses only have single phase loads, save for the few with a large air conditioner, woodworking machine, or kiln. Many houses have a missing phase, and the sparky solution is to rewire the missing phase’s loads to the remaining phase(s), never reporting and following up the council.
It would be beneficial if the behaviour is explicitly stated in the documentation. @guystewart ?
Even better would be if it could handle a missing incoming phase and preserve the 3 phases on the output, specifically to address the concern stated above.
I tried this on 3 phases multiplus 2 system in configuration “not as group”
L3 missing - continue working
L2 missing - continue working
L1 missing - switch off all 3 phases Grid input
Tomorrow i will try it in 3 Phase Multi RS Solar, will see…
Unfortunately they work as group only.
If L3 or L2 or L1 phase missing - whole 3 phase system switch off Grid Input and still working AC Out.
But, i can’t test really synchronized 3 phase loads, like 3 phase motors, etc. because I have not it(
Thank you very much for this experimentation and confirmation.
I hope the single phase input, three phase output functionality is on the Multi RS roadmap (probably only after grid codes and parallel is done)
Because the RS lacks the ability to disable switch as a group that the multis do have (but is actually not fully supported).
From my experience, if L1 phase is missing, 3 phase system based on multiplus 2 “not as a group” - immediately switch off all 3 phases AC IN and all 3 Phases AC OUT continue working perfectly and synchronized.
If it losing L2, or L3, or L2 + L3, system not switching off other phases on AC IN, and perfectly continue working without missing phase/phases in direction “from grid to load”
As I understand, it’s because L1 phase unit is “Master of masters”)
Multi RS system have option “continue with missing phase” but it not working in 3 phase configuration.
In real life, missing 1 of 3 or 2 of 3 phases in public grids happens extremely rarely. It’s Very nice option to handle this situation and keep alive phases as energy source, but on my opinion not “super necessary”
In cases using generator as 3 phase energy source, the best way to solve missing any of phase - is switching off all 3 phases AC IN immediately…
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