Monocrystalline panels are the most efficient solution over all models at converting sunlight to electricity. Since these panels are more efficient you need fewer of them and if you have limited space, these may be a great option. Ideal for RVs, trucks, boats, cars, generators and more. Maintenance-free, easy to use and offer years of renewable and free energy. Provides up to 6.7 Amps of charging. Kit includes: 12' (3.6m) extension wire, aligator clips and mounting bracket & screws. Solar Charge Controller required (sold separately - Model 14401) The Solar Controller will protect your 12 Volt Lead-Acid or Gel-Cell battery from being overcharged by the solar panel.