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Can Two Inverters (One On-Grid, One Off-Grid) Be Connected to One Network?

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  • #31 20637222
    rob160
    Level 5  

    The inverter is three-phase, so production takes place on three phases...
    In the meantime, I think I found the problem. The inverter meter seems to be going haywire and/or the Luna battery and the inverter itself.
    At night, for example for the last 3 days at 8:33 p.m., the counter seems to be turning off??? Indicates 0 consumption. During the day it also seemed to reset along with the inverter.

    I think you need to check the counter somehow... communication cables, etc.
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  • #32 20638429
    rob160
    Level 5  
    Hello again, dear forum members.
    I think I found the reason. The UPS inverter (Easun) somehow disturbs the operation of the phase to which it is connected and the DTSU666 counter. After disconnecting the power supply, everything returned to normal.
    It seems that a solution such as in my case, i.e. on-grid inverter with BMS Luna and off-grid Easun SMG II as a UPS, is not possible.
    Maybe that's why there's been so little silence from the thread's author?

    I don't think I have many options here anymore.
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  • #33 20638444
    msr99
    Level 20  
    Maybe do more tests?
    e.g. EASUN without panels, without batteries.
    EASUN in different phases.

    Quote:
    example for the last 3 days at 20:33

    and this is not the moment when the sun has just set (actually, a small amount of sun causes MPPT in EASUN to see too low power and then turns off
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  • #34 20641200
    rob160
    Level 5  
    After switching to phase 2, the DTS counter continues to go crazy. It does not see power at night and Luna is not used.

    Do you know any device that will turn on the power using, for example, RS485?
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  • #35 20884712
    tomek0035
    Level 10  
    Hello. I recently have a Fox 3600 1-phase on-grid inverter and a 10 kW ESB inverter connected to the off-grid network, which has an exit to the house. Of course, it is known that each inverter has separate sets of panels. And as I have already written, everything from the power box to the devices in the house is on phase 1.
  • #36 21062491
    cdtdsilva
    Level 10  
    tomek0035 wrote:
    Hello. I recently have a Fox 3600 1-phase on-grid inverter and a 10 kW ESB inverter connected to the off-grid network, which has an exit to the house. Of course, it is known that each inverter has separate sets of panels. And as I have already written, everything from the power box to the devices in the house is on phase 1.


    What's your question then? Do you want to combine both systems? If so your best bet would be to use a transfer switch - Use grid while the grid tie inverter is running and swapp back to your 10KW inveter during other periods.
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Topic summary

The discussion revolves around the feasibility of connecting two inverters—one on-grid and one off-grid—within a single network. Users explore various configurations, emphasizing the importance of AC coupling and compatibility between the inverters. It is noted that while connecting an on-grid inverter after an off-grid inverter is preferable, it requires careful consideration of phase compatibility. The conversation also touches on the need for dedicated circuits for off-grid loads and the potential for hybrid systems that utilize both inverters effectively. Users share experiences with specific inverter models, addressing concerns about energy management, battery charging, and compliance with local regulations regarding energy export to the grid.
Summary generated by the language model.
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