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Expanding 1200Wp PV Installation: Combining 3-Phase & Single-Phase Inverters for 4kWp Setup

kamilboski 21405 39
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #31 20015709
    grochowiakdariusz
    Level 2  
    Thanks for both options - that is, in principle, I can do both - we'll see what the installer will advise - probably what will be the best for him :) will probably bet on the variant with the least amount of work.
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  • #32 20015860
    kosmos99
    Level 38  
    DEFENCE wrote:
    it will be possible for the power company to remotely switch off installations above 10kW


    It doesn't matter how many inverters there are.
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  • #33 20020792
    grochowiakdariusz
    Level 2  
    As expected, the installer persuaded me to set up a new installation, motivating the fact that it is not known how the old one will continue to work, so it's better that there is no circus on the new inverter (that one string does not work or works poorly due to aging panels). All in all, let everyone be responsible for their part of the work - and the old panels are now 6 years old, later they will be 10, etc., while the new ones are only 4 years old ... The only thing that worries me is whether the Panasonic 9kW 3-PHASE pump - which will be installed by another company will not be stupid and, for example, turn off because it will receive 3kW more electricity on one phase? Maybe some, I don't know, voltage stabilizers are required or something.. ?? Regards
  • #34 20020805
    Slawek K.
    Level 35  
    grochowiakdariusz wrote:
    As expected, the installer persuaded me to set up a new installation, motivating the fact that it is not known how the old one will continue to work, so it's better not to cause a circus on the new inverter (that one string does not work or works poorly due to aging panels).
    All in all, let everyone be responsible for their part of the work - and the old panels are now 6 years old, later they will be 10, etc., while the new ones are only 4 years old ...
    The only thing that worries me is whether the Panasonic 9kW 3-PHASE pump - which will be installed by another company will not be stupid and, for example, turn off because it will receive 3kW more electricity on one phase? Maybe some, I don't know, voltage stabilizers are required or something.. ?? Regards

    Buddy, the pump will take as much energy as it needs, it will not "get" anything.
    If there is an excess of energy from PV production, the difference will be sent to the grid, if there is not enough, you will have to collect the difference from the grid - that's how photovoltaics work.

    Regards
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  • #35 20296220
    ukopec34
    Level 6  
    Hello, I have 2 pv installations on 2 inverters, 1 gas. The question wants to expand these 2 installations, can I buy a 3-phase inverter or just sell the 1-phase one and install a 3-phase one in the 2nd installation. The point is that the entire 2nd installation after the extension will have about 12kW.
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  • #36 20296394
    Slawek K.
    Level 35  
    You cannot have 12kWp on three single phase inverters, you will exceed the max. power for a single single phase inverter. Buy one 3 phase inverter.

    Regards
  • #37 20296476
    ukopec34
    Level 6  
    Now on 2 inverters in total I have 6.2kW on one I have 3600 and on 2 I have 3000
    Only in separate vases. There must be 2 inverters here because I have panels on 2 different buildings.
  • #38 20297046
    Slawek K.
    Level 35  
    Do this third installation on a 3-phase one, because you can't connect 6kWp to a 3.6kW single-phase inverter because it doesn't make sense, you will lose a lot of energy.

    Regards
  • #39 20318125
    quanhellneo
    Level 2  
    Hello, I have 3.84kWp for 3f the growatt 4000 inverter wants to add 6kWp. I wanted to add a growatt 6000 or 5000 inverter (I don't know if it can handle less than 6kWp) in order to turn off smaller installations in the event of a failure or high voltage to reduce the voltage on the phases. will the inverters not "bite" or do they have to be connected together by some additional device so that they can see each other? finally, I know that there is an option to buy 9000kWp and run old and new panels in 2 strings.
  • #40 20319063
    Slawek K.
    Level 35  
    You can add a second inverter, nothing will bite and you do not need any additional devices. I would recommend this 5kW for a 6kWp installation.

    Regards
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Topic summary

The discussion revolves around expanding a photovoltaic (PV) installation from an existing 1200 Wp setup to a 4 kWp configuration by combining 3-phase and single-phase inverters. Participants emphasize the importance of not exceeding 3.68 kW per phase to comply with energy regulations. Suggestions include using a 4 kW 3-phase inverter alongside a 1 kW single-phase inverter, particularly on the heavily loaded phase. Concerns about voltage increases when connecting single-phase inverters to a 3-phase system are raised, with recommendations to monitor voltage levels and consider using multiple single-phase inverters to balance loads. The conversation also touches on the implications of connecting multiple installations to a single meter and the need for proper documentation and compliance with local energy distributor regulations.
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