Water motor for direct mechanical drive

Passive

A wheel or Pelton runner in a stream driving a shaft, and the shaft driving the machine directly: a pump, a grinder, a washing drum, a workshop tool. Skips the two conversions a micro-hydro turbine makes, water to electricity and electricity back to motion, and the losses and the electronics that go with them. In exchange the work has to happen where the water is, and only while the water runs. The one row in this catalogue that produces mechanical energy without a person turning a handle.

One of 8 ways to meet Generation. Build 3/8, Upkeep 3/8, Efficiency not rated. Cost, carbon and footprint below are rated against those 8, not in absolute terms.

Cost: Low
Upkeep: Seasonal
Skill to build: Intermediate
Lifespan: Long; bearings and the runner are the wearing parts and both are replaceable
Embodied carbon: Low
Space / material use: Medium
Output timing: Continuous process
Skill to repair: Intermediate
Regulation (FR example): Works in and abstraction from a watercourse are regulated; a declaration or authorisation is normally required, and rights on non-domanial watercourses vary.

What your site needs

A watercourse with usable flow and fall, close to where the work is done

Inputs

Flowing Water (Hydro Potential)

Outputs

Mechanical Energy

Ranking in its sub-function out of 8 alternatives

Every option in this sub-function, with the value on each axis and a note on what drives it (this solution highlighted):

Solution	Build skill	Upkeep burden	Efficiency
Solar PV array	Intermediate	4	N/A
Small wind turbine	Intermediate	5	N/A
Micro-hydro turbine	Intermediate	5	N/A
Grid connection	Specialist	4	N/A
Pedal / hand-crank generator	Basic	3	N/A
Water motor for direct mechanical drive	Intermediate	5	N/A
Electric motor (mains or battery driven)	None	4	N/A
Small petrol or diesel engine (direct drive)	None	7	N/A

Build skill and upkeep burden are proxies (lower burden = simpler to maintain); the efficiency column is this sub-function’s ranking, 1 = best. “N/A” where an axis isn’t rated here.

Sources

Designing, building and using a Pelton water motor to drive tools directly

Tutorials

http://www.watermotor.net/

What this page does not tell you

No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.