HQST 300 Watt Off-Grid Polycrystalline Solar Premium Kit is designed specifically for customers to get the most power from the system. This 300W solar kit is great for off-grid applications, such as RVs, trailers, boats and sheds providing many benefits, including, but not limited to, quiet power production and grid independence. This kit includes our 30A MPPT charge controllers which is more efficient than PWM charge controllers with less power loss. We also provide the option to upgrate your charge controller to 40 MPPT for your future expansion. The HQST Premium Kits make the most efficient system possible!