Energy Systems & Design has been producing microhydro turbines since 1980. Their Watter Buddy turbines use 2” pitch diameter plastic runners. The alternator has two output settings to ensure you have the best configuration to perform with your water resource. Nozzle inserts are available in sizes of 3mm to 7mm.
It can produce up to 150 kWh per month (5kWh/day). This turbine will produce up to 150Wh/day with as little as 2gpm and 115ft of head (50psi) or as little as 25ft of head (10psi) with 5gpm. These are the minimum water resource requirements and it will produce even more power with more head and/or water flow.