3 Advantages 3 a detailed physical, dynamic control model has to be developed, allowing for selecting correct component dimensions and
values. This sector is currently work in progress.
2.2.5 System Integration and Test
All components need to be integrated into a single inverter system and be subdued to extensive testing.
Integrating the opto-mechanic PWM generator into an inverter could lead to a system with several advantages:
Less Components An opto-mechanic realisation reduces the number of components from several thousands to a few hundreds.
Cheaper Production Absence of expensive parts (controller, FPGA, ADC) leads to leaner production and low material costs.
Potentially Higher Reliability Fewer components will have less risk of failing parts and may thus rise overall system reliability
Repairability As no integrated circuits are used and mechanical parts are easy to understand, a trained technician will be able to repair such an inverter, whilst nowadays available inverters are not repairable at all in situ.
Longer Lifetime Particularly in remote or environmentally hostile locations repairs could be executed by local personnel. The repairability allows for replacement of single components and thus extends the life time of the complete system.
Economic Self-Sufficiency As the technology may be copied with very simple means, a sustainable knowledge transfer can be considered to regions, where primary solar energy is often excessively available, thus fostering self-sufficient economies.
Local Production Apart from the power semiconductors, most parts can be obtained from national manufacturers. 4 Project Collaboration
The World Bank analyses, that paying attention to the quality of both products and services can lead to reduced costs, as warranty repair and replacements can be expensive. And further, that community owned projects are more likely to attract private investors. Thus maintenance and repairability of the installation have a large impact on project success as the community based model requires substantial technical assistance in design, training and social organisation .
Sri Lanka had the Renewable Energy for Rural Economic Development Project (REREDP), running from 2002 to 2011, and was closed in December 2011 with a “Highly Satisfactory” rating from the donor agency International Development Association of the World Bank. In total 6,220 community based households were electrified with off-grid installations, and 110,575 household based off-grid installations of solar home systems have been installed (www.energyservices.lk).
According to the World Bank, the project fostered and promoted innate entrepreneurship in Sri Lanka’s energy sector. The projects have promoted private sector and community led implementation as well as touched on several key socioeconomic aspects critical to economic development such as productive use and reliance on indigenous energy resources and improvement of social delivery services in rural areas through community mobilisation and asset creation. Entrepreneurs who started in this industry are now well established enough to undertake similar projects in African countries, creating an export potential for Sri Lanka (http://www.worldbank.org/en/news/feature/2012/05/16/SriLanka-renewable-energ-rural-economic-development).
A collaboration is sought, in order to finish the development of the PoC into a final inverter product and in order to penetrate a target market to be identified.
For more detailed information, technical specification and current project status of the opto-mechanic inverter (OMI), please contact
Markus Jostock Flurgartenstr. 9
 Gunther Bensch, Jörg P. Jochen Kluve K. Jochen Kluve: Impacts of Rural Electrification in Rwanda / Institute for the Study of Labor. 2011 (IZA DP No. 6195). – Forschungsbericht
 Gwénaëlle Legros, Nigel Bruce Sophie B. Ines Havet H. Ines Havet: UNDP-WHO report on energy access in developing countries / United Nations Development Programme. 2009. – Forschungsbericht
 Saghir, Jamal: Designing Sustainable Off-Grid Rural Electrification Projects: Principles and Guidelines / The World Bank, Washington DC. 2008. – Forschungsbericht