Micro Hydroelectricity

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overshot waterwheel Massif Central

The waterwheel in the Massif Central was designed and produced by Gratia Hydro. The owner built it based on the drawings and the manual. Good in one go.

The site has a single phase electricity connection. As a result, it is not possible to work with an asynchronous generator, which is normally the most efficient solution. Now a permanent magnet generator has been installed, which is connected to the grid via an inverter. The advantage is that the wheel can turn slowly when there is little water, which increases the efficiency somewhat. Over the year it doesn't matter that much.

A PLC provides automatic control. The goal is to be as self-sufficient as possible, so that zero on the meter is achieved. Primarily, all electrical appliances in and around the house are supplied with electricity. If there is electricity left, the car is charged or the swimming pool is heated. When they are full or at the right temperature, the power of the water mill is reduced. The whole runs completely autonomously, but can also be operated manually. For example, the miller can choose, even remotely, to still use power from the grid to charge the car.