The 100W panel comes with pre-drilled mounting holes, solar connector leads, and a junction box. Allowing you to install, connect it to a controller, or expand with panels without breaking a sweat. The panels are made of premium Grade A+ monocrystalline solar cells that are more efficient than conventional polycrystalline solar cells. | Renogy | | 100W 12V Solar Panel Lightweight Semi Flexible Monocrystalline Bendable Off-Grid Charger | Black | Best Buy