There are three versions
Go for the cheaper Mega Fuse M8 version, for with Adler EF3.
Pls read wiring unlimited chalet 3.3 parallel battery
https://www.victronenergy.com/media/pg/The_Wiring_Unlimited_book/en/battery-bank-wiring.html
M8 and M10 are only the connections between the lynx. Both use M8 for the fuses.
Jens
As promised, I did some (actually a lot of) research on this matter, and my conclusions are that connecting an off-grid inverter to the grid is not compliant with CEI 021 standards but can be legal if the installation is done ‘properly’ and certified by an electrician.
In summary, the fact that it is not compliant with CEI 021 does not mean it is illegal.
Actually, it is enough to have an Enel meter, even if it is completely disconnected and not used, to be ‘non-compliant with CEI standards’ if you install an off-grid inverter. Therefore, the CEI 021 standard is very restrictive, but it does not mean that your system is illegal. At least, this is what I have been able to understand.