The Solar 40 Battery charger system is designed as an expandable system. A good product for those looking for power independence, but unsure of their power requirements. This item is the 40 watt add on panel and can only be used in conjunction with a Vision Plus Master Panel, this cannot be use don its own.You can then add up to 3 x 40 watt add on panels in total (Giving a maximum of 160 watts including the master panel). Whatever size solar panels you are looking for you need the master panel first, you can then add 1, 2 or 3 of the 40 watt add on panels to make your desired wattage. Once the master panel is installed simply glue into place the add on panels. With the waterproof link cable simply plug into the master panel. Please note the link cable is 3m in lengths so does not have to be mounted directly next to the master panel. WHAT YOU GET IN THE ADD ON PANEL. 40 Watt House Solar Panel. 3 Meters Link Cable in White. 350mm Female Link Cable with water proof cap. Panel Dimensions: 660mm x 456mm x 57mm. Operating Temperature: -40 - 85 Degree C. This item is in the category "Vehicle Parts & Accessories\Caravan, Campervan & Motorhome Parts & Accessories\Other Caravan & Motorhome Parts & Accessories". The seller is "glossopawnings" and is located in this country: GB. This item can be shipped to United Kingdom.