Hi
I am in talk with EG4 to finc a way to AC couple my current 9.75 kwh array with Fronius Primo 11.4 with new 18 kwh array and the EG4 18K inverter.
Seems easy, plug the existant 9.75 kwh of the fronius on the Generator Input of the EG4 18K and voila (need to set the fronius into micro grid mode to be able to receive frequency shift from the 18K as well but that is a detail) BUT it finally CAN NOT WORK AS EASY AS IT SEEMS.....
EG4 just told me (and thanks for them for being honest) that in that case the system can not use the 200 amp pass through when ac coupled and then you are always limited to....12 kwh output of the 18K....and that you can not export to the grid as well because "The 18K has a 2 poles internal relay that switches back and forth btw GRID IN, GEN IN and LOAD OUT. It is able to utilize 2 of these simultaneously : GRID/GEN (well you can only charge up batteries then, not your load...), GRID/LOAD (ok but then the 9.75 kwh array power....is lost) or GEN/LOAD (Nice you enjoy the power of the grid tie system, the new system.....but are limited to 12 kwh of total output....)
So yes AC coupling looks nice with 18K......until you never exceed 12 kwh of loads...if you exceed that you are DONE.
Does any expert (that i am not....) has an idea of how to manage to enjoy the power of the 2 arrays powering up the loads first, charging then the battery pack and then export to the grid. I was thinking to put a second 18k but then the cost is exploding....
I can renounce to export to the grid because with near 28 kwh of array and 60 kwh of battery i could be good anyway and in this case 3 EG4 inverters 6000 XP....that would set the bar up to 18 kwh of output.....but how to join this system with my 9.75 kwh grid tie array in order to use the power from the grid tie system first....then the power of the new 18 kwh array and then charge the battery pack....and in case of grid down how to avoid that the grid tie inverter restart seeing the power from the 3 pcs of 6000 xp....
I am lost....
Thanks
Vince
I am in talk with EG4 to finc a way to AC couple my current 9.75 kwh array with Fronius Primo 11.4 with new 18 kwh array and the EG4 18K inverter.
Seems easy, plug the existant 9.75 kwh of the fronius on the Generator Input of the EG4 18K and voila (need to set the fronius into micro grid mode to be able to receive frequency shift from the 18K as well but that is a detail) BUT it finally CAN NOT WORK AS EASY AS IT SEEMS.....
EG4 just told me (and thanks for them for being honest) that in that case the system can not use the 200 amp pass through when ac coupled and then you are always limited to....12 kwh output of the 18K....and that you can not export to the grid as well because "The 18K has a 2 poles internal relay that switches back and forth btw GRID IN, GEN IN and LOAD OUT. It is able to utilize 2 of these simultaneously : GRID/GEN (well you can only charge up batteries then, not your load...), GRID/LOAD (ok but then the 9.75 kwh array power....is lost) or GEN/LOAD (Nice you enjoy the power of the grid tie system, the new system.....but are limited to 12 kwh of total output....)
So yes AC coupling looks nice with 18K......until you never exceed 12 kwh of loads...if you exceed that you are DONE.
Does any expert (that i am not....) has an idea of how to manage to enjoy the power of the 2 arrays powering up the loads first, charging then the battery pack and then export to the grid. I was thinking to put a second 18k but then the cost is exploding....
I can renounce to export to the grid because with near 28 kwh of array and 60 kwh of battery i could be good anyway and in this case 3 EG4 inverters 6000 XP....that would set the bar up to 18 kwh of output.....but how to join this system with my 9.75 kwh grid tie array in order to use the power from the grid tie system first....then the power of the new 18 kwh array and then charge the battery pack....and in case of grid down how to avoid that the grid tie inverter restart seeing the power from the 3 pcs of 6000 xp....
I am lost....
Thanks
Vince