This kit is a larger kit for storing excess energy from an existing grid-tied solar PV installation, or for storing cheap night-time energy (off-peak tarifs e.g. Octopus) for use during the day and peak tarif times.
More battery modules can be added at any time, and AC coupled or DC coupled solar PV can also be added to further decrease consumption from the grid, saving even more off your bills.
This system has an integrated MPPT, so is ready for a DC coupled PV installation at any moment.
NB: The 5kVA Victron EasySolar-II has received G98/99 certification on the ENA type test register, see link: https://www.ena-eng.org/gen-ttr/Index.aspx?Action=ViewDetail&EID=87624009&tab=search