This is a hugely specialist area. Depending on the reasons that you want to add solar system for flats, there are many options open to you.
Developers and landlords typically have a 3-phase electrical system managing the energy entering the property. This system then distributes single-phase energy to each flat individually. The tenants then have their own consumer unit (fuse box) and billing from the energy supplier.
Housing associations and charities – many of you are landlords and looking for the maximum efficiency for the tenants.
Owners – with the cost of energy unpredictable many owners and consortiums of flat owners would like to know what options solar offers on either an individual or group basis.