unit will charge a batt but if you have no water flow it will act as a motor and start running use the threaded hose connections to gather water and keep the wiring above water It outputs 12 Volts DC at full flow 340-22062 Stator - Mercury Marine Various 398-818535A10 | DBE Mn Mcro Hydro Water Turbne Hydropower Generator Portable Battery... 10W 5V DC Hydroelectric Power Micro hydro Generator Portable Water this is a generater not a pump it takes a good amount of water flow to get it to generate a small amount of electricity High efficiency, long lifespan.Size: 82 x 42mm/3.23 x 1.65(L X D) Low flow loss and low water pressure. Water runs threw it and generates electricity. Hydro Generator 12V Micro Flow Hydraulic Water Charging Tool DIY Blk Kit For Home