Page - 141 - in Clean Water Using Solar and Wind - Outside the Power Grid

© 2019 The Author. This is an Open Access book chapter distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-ND 4.0), which permits copying and redistribution for non-commercial purposes with no derivatives, provided the original work is properly cited (https://creativecommons.org/licenses/by-nc-nd/4.0/). This does not affect the rights licensed or assigned from any third party in this book. The chapter is from the book Clean Water Using Solar and Wind: Outside the Power Grid, Gustaf Olsson (Author). doi: 10.2166/9781780409443_0141 Chapter 11 Energy management systems “Automation does not need to be our enemy. I think machines can make life easier for men, if men do not let the machines dominate them.” John F. Kennedy, US President 1961–1963. Any off-grid system for pumping and cleaning water needs a control system to take care of the energy management. A solar PV unit or a wind turbine will produce electric energy independent of the required demand. An automatic control system will balance the power flow through the system. The energy production system includes not only the solar panel and the wind turbine; other components are inverters, batteries and charge controllers. The load consists of lighting, small household devices and low-power television sets as well as water pumps, disinfection lamps and desalination units. Their management must prioritise the demand side when the delivered power is not sufficiently high to provide any of the loads. Downloaded from https://iwaponline.com/ebooks/book-pdf/520710/wio9781780409443.pdf by IWA Publishing user