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2019 Upgraded solar powered water pump with battery backup , it can work continuously for 2 hours at dusk or on cloudy day with full charge. And with built-in water level sensor system, when the basin is out of water, it can automatically stop working.... Note: If you expose the solar panel in sunlight for more than 25 seconds before putting the pump into water, it will be detected to be in a state of water shortage & needs to be reactivated: Cover the solar panel in sunlight then expose it, the pump will run again, then put it into water within 15s Q: Only works in bright sunshine, battery backup does not function at dusk A: The sunshine is not enough, let the solar panel charge in full sun for 8 hours Product Specification: Material: ABS Solar Panel: 6V/2.5W Pump input: DC 4.5-12V Battery: Li-ion 14500 3.7V/800mAh Maximum quantity of flow: 42GPH / 160L/h Maximum water height: 1.64ft/0.5m Solar Panel Diameter: 7.08 inch Water Pump Size: 1.5"L x 1.42 "W x 1.5"H N.W.: 1100g Package 1 x Solar Panel 1 x Pump 6 x Fountain Heads