Electronic load controllers (ELCs) are a critical component of micro hydropower systems, which keep turbines, generators, and the energy they produce within safe operating ranges, as loads are switched on and off.  ELCs can prevent damage to appliances and micro hydro components and even mitigate fire and electrical hazards.  Despite their important role, ELCs are generally the least understood component of micro hydro systems.  Equipment selection can be particularly challenging if practitioners are unfamiliar with the different types of ELCs and their relative merits. 

To help demystify ELCs and ease the equipment selection process, our Controllers and Load Management Work Stream has developed an easy-to-follow factsheet.  This “Basics of Electronic Load Controllers (ELCs)" tool provides a useful background on electronic, automatic and manual flow control, with pointers on their relative cost and suitability in different contexts.  Specific types of ELC designs are further illuminated, as well as ballast/dump load types and control methods, commissioning checks, and useful questions to ask of suppliers.   

Check out the “Basics of Electronic Load Controllers (ELCs)" at this link.

We extend our thanks to Work Stream contributors Ajith Kumara, Bob Matthews, Dan Frydman, Jiwan Kumar Mallik and Rams Vaidhyanathan.

For more useful tools, check out our Micro Hydro Toolkit for Practitioners, which includes a DIY ELC Simulation Tool designed to help train local operators!

On April 7th, eleven micro hydropower professionals from six countries of South and Southeast Asia will be convening in Malaysia to participate in an ELC training workshop hosted by HPNET members Green Empowerment and Tonibung, funded by the WISIONS SEPS.
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Electronic load controllers (ELCs) can be a vital component of micro hydropower systems. Without ELCs or other load management solutions, the electricity generated could veer outside of standard specifications, which may cause damage to appliances and system components, or become fire and electrical hazards in worst case scenarios.  However, it is often the least understood component of micro hydro systems by local practitioners, and hence can lead to long periods of downtime and high costs, when in need of troubleshooting, repair, or replacement.

The workshop aims to facilitate knowledge transfer of an Open Source ELC design to the participants. This design has been produced through collaborative project work supported by Engineers Without Borders-UK, their local partners Sibat (Philippines) and Tonibung (Malaysia). Work was continued by Green Empowerment and WISIONS, bringing about this event where the technology can be disseminated, reviewed and improved by other practitioners in HPNET.
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The training will last two weeks, covering topics such as digital electronics, system topologies, troubleshooting and build sessions to improve practical electronics skills. The exchange activities will be done in Tonibung’s Center for Renewable Energy and Appropriate Technology. At the end of the training, participants are expected to have built their own digital ELC main circuit boards, have a good understanding of its operation, and have the skills required for installation, maintenance and repair of the system. They will be able to bring the knowledge gained back to their home organizations along with notes and resources, enabling them to share it with partners, and apply it to their projects for the advancement of sustainable development in their respective countries.

The exchange will explore how to further advance the Open Source ELC to include features for interconnection to the main grid and project-to-project interconnection, as well as improved load management.  The exchange builds onto the local momentum generated by participants of HPNET's 2016 regional training, "Capacity Building for Electronic Load Controller Technicians in S/SE Asia", supported by the WISIONS SEPS.