This was also my understanding, to use the grid only as AC IN of the MP2 and to power the PSU
I really would, but the problem is not technical but you will not find anybody professional to sign for it.
I also try adding double anti-islanding certified Ziehl option (https://www.victronenergy.com/upload/documents/Ziehl-Voltage-&-Frequency-relay-SPI1021.pdf) in 2025 the inverter need also to have the CEI021certification.
If someone had other experience in Italy please share.
Sorry, but I still don’t understand.
In Italy, if you have an off-grid system, you cannot feed electricity into the grid, but you can certainly use it as AC input in your MP Inverter.
Unfortunarely NO, you do not have permission to connect an inverter to the grid if not certified (in or out 230v side of MPII). Nobody will sign for it, it is a red tape issue.
Look for installers (not reseller) on the Victron website and you will find only Nautical and Camper’s installers. I would love to be wrong, but it’s like that.
This is the first time I hear about this. Where did you find it written? By connecting the grid to the AC IN of the inverter, the inverter is basically seen as a simple load, so there is no obvious explanation for prohibiting it.
By the way I will investigate.
I am Not 100% sure, but thing the MP2 15k has two plus and two negativ Connection to battery and will occupy half a Lynx.
I recommend 4x 15kWh batteries, each directly connected to the Lynxs. Alternatively, connect two pairs of two batteries to the Lynx. If connecting pairs, take plus from one battery and negative from the other battery to equalize current over the two batteries. Pms find details in Victron’s free book “Wiring unlimited”
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If the inverter is configured in off-grid mode, as it happens with boats 
connected to the port sockets… I don’t see why there should be any problems.
my advice to you would be to contact any PV installer near you and ask about the paper work in Italy (the 5 sheets the installer have to fill to send to the grid, commune etc…).
If you find an installer with a solution for a MPII, let us Know…we all want to ear about it.
This is wrong. AC-in can be used as the one and only connection of a MP2 to the grid, and it can draw power from the grid AND as well deliver power to the grid. This is the configuration of my grid tied ESS.
I don’t believe you have to send any communication to GSE or Municipality for off-grid installations
Fotovoltaico Off Grid: senza allaccio Enel e GSE - Confronta Facile.
Come e perchè installare un impianto fotovoltaico a isola
https://www.nwgitalia.it/blog/fotovoltaico-senza-immissione-rete
Anyway, it would be helpful to have an official requirement from a recognized authority, but I’m not sure who to contact. I don’t think the usual installer has that much knowledge.
I’m referring to the case the inverter is configured in off-grid mode and the loads (e.g. wallbox for EV) are isolated to the grid.
Unless the current could go back from panels and battery to the AC IN and therefore to the grid.
I have just sent a certified email (PEC) to GSE with the following message:
Hello,
I would like some clarification on the regulations regarding off-grid systems, particularly partial off-grid systems where the grid (Enel) is used exclusively as a backup to charge the batteries.
Let me explain better.
Suppose we have loads, such as an electric car charging wallbox, that are completely disconnected from the electrical grid.
If I want to power these loads (off-grid) with an off-grid photovoltaic system, can I use the electrical grid as the input for the off-grid inverter, with the output of this inverter connected exclusively to the load (car charging wallbox) that is not connected to the electrical grid?
Thank you,
Let’s see if and what they respond.
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If the parallel of batteries is done within the Link Distr we have to remove the connection between them as showed below, correct?
… in this case you can anytime simply reconfigure the system to on-grid mode. I am living in Germany, but I don’t believe that Italian laws are much different.
Exactly.
If you have 4 batteries in two sets of two batteries, than connect plus from the one and minus from the other one j the same set.
Parallel batteries shall be connected diagonally.
MP2 8k-15k have 4 M6 bolts for battery, though two pairs. It should be fused, though occupies 2 out of 4 ports at a Lynx.
15k is 300A @50V. Just for the MP2 15k you need 30kWh of battery to load/discharge at 1C. Recommended charge is 0.5C.
Yes, Adler EF3 fits into normal Lynx. No need for T-fuse version.
Use them at least for batteries. As they might be cheaper than high quality Mega fuses, you could also use them for MP2 and MPPTs.
Maybe you can order the fuses from Rayotech @Meine_Energiewende
Else search for the term. I posted some distributors.
