I am busy commissioning an ESS system using a Multiplus II, SmartSolar and Pylontech batteries. The latest draft South African regulations recommends that the battery terminals be left floating (i.e. neither + nor - are grounded), whereas Victron recommends that the negative battery terminal be grounded.
Because of the potentially large fault currents that may be involved (and thus requiring thick cables) I am tempted to cut costs and effort and not ground either battery terminal, leaving the batteries floating. (The chassis for the SmartSolar and batteries will still be grounded, as well as the PV array frames.)
Is this configuration supported by the SmartSolar? Can I expect any operational issues if I go this route?