Grid connection Package, this complete 500w solar panel installation kit, including solar panels, soladin inverter, roof fixing kit, isolation switches, solar cables, MC4 clips, generation meter and one set of PV warning labels. This Photovoltaic kit will enable you to use the electrical energy free from the Sun direct to your house. The .5kW Solar PV installation kit is complete ready for commission to the grid for the .21p feed in tariff, generating a possible 500kwh of free electricity each year. All of our solar kits are assembled to order to fit PV onto a slate roof. In the details above roof fittings are for a standard slate fixing kit.If you require any other fixing brackets please advise.