Split and Dasy working together?

[The Blind Wolf]

Was thinki ng, and maybe it was already answered.  But, in my case I have split setup, but if I wanted to add a third gs inverter, couldn't I use one as a dasy where as it is input 240v and provides extra power to the box when needed? or would I need a 12k unit to pull that off?  cause I'm guessing the master is not even change as far as driving the breaker, where as the dasy is watching and giveing when needed. so it should work even on my setup. just I would need two 6k to do a 50/50  Maybe have it where it can be throuddel to only provide 25% of the load needed that is running?

[Sid Genetry Solar]

This will not work to the full extent desired.  Technically it will partially work, with several major caveats--and none of them too desirable.

The inverter set to parallel mode will not provide any output power unless it sees a frequency shift on the AC input (from the system master inverter).  Said frequency shift is provided by the master inverter (and not possible in charge/ATS modes).

• If the master is a 120v single-phase split-sync master, it can only provide a frequency shift based on ONE PHASE load, not the total load.  In other words, the "parallel" inverter will only react to loads on one phase, not the other.
• Amperage throttle provided by the master over the AC line frequency (due to the master being 120v single phase, parallel being 240v split phase), will be off by a factor of 2, so the parallel inverter's response will be twice as strong as necessary.
• With the parallel inverter being set to 240, it will backfeed power equally into both split-sync inverters--and if the load is significantly imbalanced between the 2 phases, this will result in power going in reverse through the slave split-sync inverter.

There's a limit to how much can be done with a GS inverter.  I might be trying to give them all sorts of features, but they can't jangle together in any which possible configuration and clean the top of the ceiling fan blades too.

[dickson]

This will not work to the full extent desired.  Technically it will partially work, with several major caveats--and none of them too desirable.

The  video show  the  daisy chain  working  with 2  GS 240vac inverters .      I  think Sean will  have to  convert the  120vac  back to 240vac  and there  will be cost for  shipping   and  not  open the  case  to keep the   warranty  .     Is the  6kw GS  inverter  set  for max  12kw inductive surge ?    The  20000 watt surge in the video  will  shut down  the  inverter  if the  setting not change .    

[The Blind Wolf]

Well, I not going to change from split phase, heck no, its faster then dasy will ever be.  Just make sure you got enough battery power to back itup though, and no loose wire, *Hint, Hint*  I was just thinking it might work, then basicly your saying it would take another pair of split phase inverters to probley pull it off then so it will be a 50/50 balance.  Oh, and the Slave, loves washing cloths by the way, real smooth with no hick ups.  

[Sid Genetry Solar]

1 hour ago, dickson said:

 Is the  6kw GS  inverter  set  for max  12kw inductive surge ? 

More or less...we did unlock the inverter and disable the limit for testing purposes.  Once we got the parallel mode working more like it's supposed to, the surge load seems to have reduced slightly--or maybe that's a result of the code voltage regulation fixes.  Not sure at the moment.

 

1 hour ago, The Blind Wolf said:

Oh, and the Slave, loves washing cloths by the way, real smooth with no hick ups.

That's good to know.  Almost certain that that pins down the cause of the issue...good thing is it can be fixed.

 

1 hour ago, The Blind Wolf said:

I was just thinking it might work, then basicly your saying it would take another pair of split phase inverters to probley pull it off then so it will be a 50/50 balance.

No.  If you want a parallel inverter system, the master inverter needs to be at the full output voltage (usually 240v split phase), as it is responsible for the "throttle" of all other inverters on the system.  If the "master" can only see one phase, there's no way it can react to a load on the other phase to "signal" the parallel slave inverter to turn on.

[The Blind Wolf]

Geesh, no love. . . 😛

 

How about grid tie mode  tehn?  I guess thats one of the codeing yuou got to do next. . . but if the third inverter is in grid tie, wouldn't that bypass seeing the split phase setup?  

 

I sure hope my AC isn't one of those 77a kind. . .  there is no way my battery bank would be able to pump that much power out at once. it would melt my wires !!!.  and I got a 2 and half I think miught be a 3 and half.  but its a heat pump. . . with a stupid eletric heater strip, got to get them out here to either fix the wireing or just take it out all together, there is no way I can run the heater off of two gs inverters, it would smoke them like a chicken on a fire squawed.  its a 9kw heater strip. on top of 2.5w for the heat pump, I would have to turn everything all in the house to even remotely run just that. 

[Sid Genetry Solar]

28 minutes ago, The Blind Wolf said:

How about grid tie mode  tehn?

There is currently no grid-tie mode, though I don't see how it could help.  Grid tie units basically blindly pump out as much power into "the grid" as possible, unless throttled down, or parameters go out of range (in which case it shuts down). 

 

With your system inverters as a split-sync setup, it should happily run up to a solid 12kw output.  Should be plenty.