The ideal choice to prevent battery drain. The 5W panel provides a continuous trickle feed maintaining and extending the life of any 12V battery and delivers approx 32.5Wh per day. The 5W solar panel is fitted with a blocking diode to prevent reverse current drain and is supplied with all the necessary cable (4m), connectors and detailed installation instructions. NOTE – The 5W panel kit does not require a charge controller if the battery to be used is larger than 35Ah