Powers your Kiwi Bog The system consists of four components. A 4 watt solar panel A special regulator charger that will even charge the batteries when there is less than 12v coming from the panel and two 12v 7amp hour gel cells. No guarantee can be given that this will power the bog at all times as sunlight naturally varies from place to place and installation to installation. The panel produces around 4 watts in sun and the bog can have a low drain fan installed that draws not much more than half a watt. The batteries are 12 volt 7 amp hour and two are supplied. Battery storage is therefore 12 *14 watt hours = 168 watt hours and the fan uses about 0.5 watts meaning that supply with no sun should continue for 168 * 2 = 336 hours divided by 24 = 14 days. In the event that the batteries do go flat, the power plug at the back of the bog should be removed until the panel has recharged the batteries. 42 hours of sunlight may be needed to fully restore the bat