Ralf, I think I have a plan!
I will take the Buttner Lithium pack with a couple of extra batteries, still E5k less than Mastervolt with 2 but a difference of 480 amp with B and 720 with 2 MV batteries. Then I will get the dealer to take out the Buttner MT-ICC 3.000 SI-N / 120 A inverter charger and fit a Victron Quatro plus a Victron remote panel. Hopefully for a credit on the returned Buttner. If not I will still be in pocket and have a MT-ICC 3.000 SI-N / 120 A to sell. The units are about the same size. But maybe Buttner have a more refined unit with what I want, as the Buttner 160 amp Lith battery that Morelo offer is not on the Buttner web site?
Michael