Set 4 Rigid Solar Panel Installation Brackets. The Renogy Z-Bracket Mount System is designed to support the installation of single solar panel units; generally in off-grid installations. These units are ideal for installation on RV roofs and non-inhabited dwellings such as sheds or garages. It is also suited as attachment to a user made structure such as a wooden frame. The system comes complete with all fasteners to secure the system to the installation surface. This system makes the installation of small solar systems easy; affordable and quick. Please Note: Not recommended for panels over 160 watt. If you do want to use this product for panels over 150 watt; you would need 2 sets of this Z bracket per panel.