Need help with sizing? Just give us a call, we offer custom RV kits based on your RV configuration.Plug solar panel RV mounting kit.SpotTruPower solar RV kits let you charge your RV batteries safely without overcharging or damaging your sensitive electronics.SpotIncluded quick disconnect cablesIncluded MPPT solar controllerWorks with all 12V or 24V battery typesDesigned for RV use20 year solar panel warrantyEfficient low light level solar cellsTruPower RV DC 100W Solar Kit: The 100W DC RV Solar Kit is the largest RV Solar Kit offered. The 100W DC Kit is designed to offer the most power available to RV travelers on the market and still provide a low-cost clean and efficient alternative to generators and expensive campground electrical connections. This like the other kits available mounts directly onto the roof of your RV with an included flush mounting kit. Benefits: Easy to install FREE power thanks to the sun Complete pre-packaged kit MPPT solar controller for maximum shading protection and power performance (20% more energy yield) Kit Contents: (1) SolMaxx-100 Watt Solar Panel (1) TruPower MPPT Charge Controller (1) 30ft wire from solar panels to battery (Charge controller in between) (12 AWG / 4mm2) (1) Set of Flush mounting hardware: Includes (4) end mounting brackets, two center support brackets. (1) Wall / penetration transition junction box Solar Panel: Mono crystalline 100W solar panel (X1), total of 100 Watts Designed Battery Charging Voltage: 12v or 24V battery configuration, with auto voltage selecting through MPPT controller.Suggested tools: Caulk gun (for sealing) Hardware for fastening mounting brackets to the roof / support roof (normal attachment to RV roof is by silicone sealant) Hole saw (for penetration through roof / wall of RV) Wire cutters + wire strippers Channel locks Yes - these units are designed to be left outside.Charge time depends on the size (capacity) of the battery. If you need help, just shoot us a message on live chat or give us a call.The solar panels are designed to last 20 years. These are non-epoxy encapsulated soar panels, eliminating the "yellow" tinting caused by the UV light on low quality solar lights.