Is it possible to connect a single-phase inverter so that the current is divided

But I just want to add a little more than 3.68 kW of panels, and the 3 kW inverter stays the same. The power of the panels counts to the coefficient of 0.7 (over 10 kW) instead of 0.8 and for fire protection consultation (over 6.5 kW), but also to the requirement that the inverter must be 3-phase (which would force the change of 1-phase connection to 3-phase).

Don't worry and don't report at all? The meter will never register more power actually fed into the grid, because once the inverter will limit it to 3 kW, and auto-consumption will be subtracted from this. Mainly, I'm afraid that more panels will be visible in Google Maps in a while...

marekm1972 wrote:

more panels will be available in Google Maps soon...

You underestimate this institution
3.68kw is the limit per phase. It used to be bigger.

Anyway, if you want to add two panels (plus some 700w) you will overload the inverter to 146%.. (3.68 kW + 0.7 kW) A bit much..

Add panels to 9.9kw change the inverter to 3phase. And nothing will change for you (you will still be at 80% acceptance) if you have received the installation before March 31

I understand this limit for a 3-phase installation so as not to introduce excessive asymmetry, but can I also be forced to switch to 3-phase if I have a 1-phase? I'm running this mostly on a 1-phase UPS anyway that powers some computer and mains equipment, so I won't be spreading the load evenly across the 3 phases.

I have such and no other amount of space on the roof of the garage, I can't physically squeeze more. I do not overload the inverter heavily, because there will never be maximum power from both east-west strings connected in parallel at the same time.

I also have a second installation at home (same address, separate building, separate 3-phase meter) and here I want to expand it to almost 10 kW - realistically, this is enough for a fairly complicated roof without partial shading (optimizers or micro inverters, which a few companies willingly provide wanted to sell, but these are additional costs and over 10 kW I fall into 0.7).

Both installations (small 1-phase on the garage and larger 3-phase on the house) reported earlier, there are 2 2-way meters. Energa, when changing the meter, checked whether there is actually an installation, and the meter itself is of the "smart" type (it communicates via GSM, statistics updated once a day can be viewed later on every day, even broken down every hour - full surveillance).

msr99 wrote:

Add panels to 9.9kw change the inverter to 3phase. And nothing will change for you

Nothing will change except one thing .

marekm1972 wrote:

(which would force the change of 1-phase connection to 3-phase).

My experience with Tauron (as of 2024)
If it is more than 3.68 kW of panels, they will not let you register a single phase inverter, only a 3 phase equivalent.
What they let you do above 3.68KW is install 3 single phase inverters and you can have one up to 3.68KW and 2 microinverters of 330W, for example. This might be a better way for people adding a couple more panels and keeping the existing system unchanged. Note that above 3.68KW total it must be 3 single phase inverters each under 3.68KW, not two.

One problem is that while they let you add storage or panels, there is a tick box asking if you made any changes to the inverter, If so you will need an installer form to document the changes. It can't be done online.

Similarly the online form only lets you use one on the Current list of approved devices. For those that have a pre G98/G99 Inverter I don't know how changes to the instalation are conducted as they always ask you for everything you have, not just the aditions, so you will need an installer form and probably details of the original submission.