6.48 mm diameter nozzle delivering 0.91 l/s to the runner which is rotating at 1084 rpm and generating 225 watts into the grid at an overall efficiency of 47%.

Tuesday, 7 October 2025

Year end results for 2024-25 water year.

 For those few people around the world who search the internet for good data on how productive domestic scale micro-hydro is, here are my figures for the past year.

As years go, it has been a dry year in terms of rainfall, and the turbine's output has consequently been not as good as some years. The year end figures were saved from being too bad by the year starting off very wet and this meant that a good deal of the year's total energy was generated by the end of February. After that, rain became scarce and generation steadily declined for the remainder of the year.

Nevertheless, with 4534 kWh generated, I can't grumble.

In each graph, the bold black line represents data from the 2024-25 water year (Oct 2024 to Sep 2025).

1. Daily output (mean daily power kW / total daily energy kWh)














2. Cumulative energy output (kWh)














3. Power duration curve (number of days generating at measured levels of power output)














4. Whole year rainfall vs whole year energy generated.



No comments: