Expanding 14x310Wp PV System with Fronius 4kW Inverter: Adding Two Panels - Options & Solutions

I was doing a PV 14x310Wp and Fronius 4kW system last year. Now I wanted to add two more of the same panels. Unfortunately, the problem is that now this installation with this inverter will not work. So my question is what to do.
1. Add these 2 panels and do not report it, because the inverter will not work with more power anyway.
2. Add and report? Just as?
3. Leave it alone and do nothing.
Thanks.

Apart from this, is fronius enough to: 2. Add and report? Just as?

theo33 wrote:

Apart from this, is fronius enough to: 2. Add and report? Just as?

Yes you can add. No problem if that's the case.
Now how do I report it? There's a possibility?

What is Fronius? Report, update the data on the same form as you reported

noja102 wrote:

What is Fronius? Report, update the data on the same form as you reported

I forgot to write the most important one is 1F. Fronius Primo 4.0-1. He has papers, only this power on 1F.

And so the inverter will not let you out more than it can, adding panels will improve the start and daily yields. I would have put that as well.

andrzej20001 wrote:

And so the inverter will not let you out more than it can, adding panels will improve the start and daily yields. I would have put that as well.

That's why I want to add, because I oversized these panels a little too little. The inverter remains as it was in the application. I don't think they're going to crawl and count the panels. And the power of the panels decreases over time. But can there be any problems? I don't think they will pick on the production, because it can be different in individual years. It's only 600Wp. When they replaced the counters, no one checked anything. However, there are no tricks with ZE, if something is wrong. Oh tempting.

Pan_Piotrus wrote:

noja102 wrote:

What is Fronius? Report, update the data on the same form as you reported

I forgot to write the most important one is 1F. Fronius Primo 4.0-1. He has papers, only this power on 1F.

You report as a new installation and that 1-phase is max 3.68kW 11 panels

So going back to the beginning is option 3.

3301 wrote:

Pan_Piotrus wrote:

noja102 wrote:

What is Fronius? Report, update the data on the same form as you reported

I forgot to write the most important one is 1F. Fronius Primo 4.0-1. He has papers, only this power on 1F.

You report as a new installation and that 1-phase is a maximum of 3.68 kW

So going back to the beginning is option 3.

That's the point, because they'll reject it, that's why I'm asking. I guess you can limit the power in it, but it doesn't really make sense. I'd rather stay with what I have.
Thanks. I'll think about that too.

Add panels and report nothing!
And so it will be an imperceptible increase in power, no one will count your panels.
Put on these two extra and enjoy more fitness, do not report anything.

As Leon444 wrote, install, do not report and use. If someone asks, you can say that you have these two panels on a separate line, in an off-grid for charging batteries (in the event of a blackout) or for a boiler.

Maybe also in this topic, I'm thinking about adding 3-4 panels to the existing PV 4.96kWp. (2x 8 panels 310W east-west). Please advise if this will be ok. Additional panels are planned to be placed on the south side of the roof of the farm building and connected to a new microinverter also installed in this building. Can I connect the output from the inverter to any phase in the 3-phase installation of this building. The power supply to this building comes from a bi-directional meter installed by ZE in a residential building. Will it work properly?

kazek1561 wrote:

Maybe also in this topic, I'm thinking about adding 3-4 panels to the existing PV 4.96kWp. (2x 8 panels 310W east-west). Please advise if this will be ok. Additional panels are planned to be placed on the south side of the roof of the farm building and connected to a new microinverter also installed in this building. Can I connect the output from the inverter to any phase in the 3-phase installation of this building. The power supply to this building comes from a bi-directional meter installed by ZE in a residential building. Will it work properly?

If you have a single-phase inverter, you may have a problem with reporting the enlarged installation to the ZE. Currently, single-phase installations can have a maximum of 3.68 kWp. Check it out before proceeding...
And connect the inverter to the phase on which you have the greatest load during the day when the PV is producing. You will then have the greatest autoconsumption...

The main PV inverter is 3 phase. I have too little yield of about 3900 from the installation of 4.96kWp. These additionally produced 1000kWh will be used for additional heating in the winter and powering the hot water boiler and air conditioning in the summer. I will not report anything anywhere, I will not produce more in total than the reported PV.

kazek1561 wrote:

The main PV inverter is 3 phase.

What brand and wattage is this inverter?

My inverter is a three-phase Fronius symo 4.5. I do not want to connect additional panels to this inverter because they will be on the south side and from what I was told they will have a different yield and it will not be the right interaction between them and Fronius. That's what they advise me to do, and I'm trying to find confirmation of such (and maybe another) assembly here on the forum. I know for sure that these additional 1000kWh will be very useful for supporting heating - I use two air conditioners to heat the ground floor of 80m2 and it works great for me.

Micro-plug these panels into an outlet and that's it.

I have that problem too. I have a three-phase PV 7 kW and I want to add about 2.8 kW on one phase (the most heavily loaded - CW heater 2 kW, PC 2 kW) on 5 Envertech EVT560 microinverters (10 panels) but I don't know if it will go through the application. It is supposed to be within the limit of up to 3.68 kW single-phase (and installation up to 10 kW with a factor of 0.8) but will the power industry accept it? I wanted to "produce" on the phase that is most loaded so that the interfacial balancing would be beneficial. I am talking about adding a new single-phase PV system to an existing three-phase PV installation. Due to the existing network in the facility, I cannot install a three-phase installation and make PV in 3F. For this reason, I am not interested in distributing the loads evenly. I want to add a new (separate) PV 1F system (

It's easier to spread the load more evenly

It should be better laid out as a colleague wrote. A few to the right and a few to the left.
I removed the unnecessary ones. Please take care of the culture of expression.[TM]

I have this problem too I would like to add one or two panels. I have 13 panels 340w total 4420w facing south. growatt 4000 tl3-s inverter.
I will add that the inverter allows more ac production power
I give today's production and maximum production capacity.


If I add 1 or 2 more panels, I have to report it somewhere or not, it has a contract with PGE.
I wonder when the inverter will stop today it showed 4368w. and the max power is 4000w.
But in the specification 4000 tl3-s to 6000 tl3-s have the same weight and other parameters.


I think it's enough to just move somewhere in the advanced options growatt. Only I don't have access to it.

For now, the graph has not flattened out at noon, that is, it does not cut off the power.

And I have a technical question related to this, because I also want to add two 310w panels to the installation. The inverter will accept them. The problem is that the company from which I bought the installation is valuing such an extension for 5,000. PLN, because it is a whole working day for them, including travel and formalities. I could buy two of these panels for less than $1,000. PLN and install them yourself. The only question is whether I can/will handle this topic myself (in the sense of not risking too much and I don't mean falling from the roof)?

As long as you don't disconnect the connectors under load, you should be fine.
So you have to turn off the inverter.

And apart from the panels and the mounting system, do you need additional wiring or just plugging the panel into the panel? If the new modules were of the same power but from a different company (310wP longs are no longer available), will these connectors fit or not and then I would have to use some hermetic cans?

..::B::.. wrote:

do you need additional wiring or just plugging the panel into the panel?

Depending on the length of the cables and the arrangement of the panels. If not, you will need to extend it with a suitable section of the cable.

..::B::.. wrote:

If the new modules were of the same power but from a different company (310wP longs are no longer available), these connectors will fit,

You need to see what type of connector, and compare the voltage and current of the panel to make it as close as possible.
Most panels have MC4 connectors.

I understand that only one string is connected to one MPPT in your installation?

..::B::.. wrote:

And I have a technical question related to this, because I also want to add two 310w panels to the installation. The inverter will accept them. The problem is that the company from which I bought the installation is valuing such an extension for 5,000. PLN, because it is a whole working day for them, including travel and formalities. I could buy two of these panels for less than $1,000. PLN and install them yourself. The only question is whether I can/will handle this topic myself (in the sense of not risking too much and I don't mean falling from the roof)?

You add two panels to how many already? These two are about 70V more and about 600W, you have to calculate it somehow.

I'm not paying yet. He discerns. I currently have 3.72 kWp connected to the only MPP tracker in the fronius 3.7-3-S inverter. acc. specification max. the power of the generator is 7.4kWpeak, so these two panels will not cause him problems. The supporting structure on the roof has practically two free fields for adding panels. I would prefer to order it to someone, but for reasonable money. Maybe someone would be interested - around Poznań? I will help physically if needed. ?

..::B::.. wrote:

I'm not paying yet. He discerns. I currently have 3.72 kWp connected to the only MPP tracker in the fronius 3.7-3-S inverter. acc. specification max. the power of the generator is 7.4kWpeak, so these two panels will not cause him problems. The supporting structure on the roof has practically two free fields for adding panels. I would prefer to order it to someone, but for reasonable money. Maybe someone would be interested - around Poznań? I will help physically if needed. ?

It turns out that if you add two, it will be 14 in series, so the inverter voltage will not be exceeded and it will be ok. As long as the added ones have the same or similar current

hello, I have a 4.56 kW installation and this is reported and the inverter is 5 kW, I would like to add 1-2 panels for a full 5 kW or report such an extension?

Raku2008 wrote:

hello, I have a 4.56 kW installation and this is reported and the inverter is 5 kW, I would like to add 1-2 panels for a full 5 kW or report such an extension?

I would just like to remind everyone "builders" that if we add NEW panels IN SERIES with panels of even the same type but used for several years, especially in the case of these cheaper models, a significant current imbalance may occur and the so-called reverse currents can consume most of the extra power, as well as reduce the efficiency and service life of the entire installation .
If the inverter has a second MPPT, I don't see a problem with adding anything, but then there will be several panels due to the minimum supported voltages.
And of course the inverter will then need to be reconfigured.

As for the application, yes - in your case it will pass calmly, of course, slapped by the D + E electrician.
In order to quickly because in a few months the rules will change.