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MJ (Thinus) Booysen, Professor in Engineering, Chair in the Internet of Things, Stellenbosch University

Home power backup systems -- electrical engineers answer your questions

South Africans are taking their power supply into their own hands with backup systems that don't rely on power utility Eskom. Ihsaan Haffejee/Anadolu Agency via Getty Images

South Africa’s electricity utility Eskom has made it clear that “loadshedding” – rolling scheduled power cuts – isn’t going to end any time soon. This reality, and President Cyril Ramaphosa’s announcement during his annual state of the nation speech on 9 February 2023 that tax incentives for solar power use are imminent, mean that many people are considering alternative electricity supply systems for their homes.

But deciding on the best system isn’t a simple matter. There’s a bewildering array of jargon to sift through and many elements to consider, from the right kind of inverter to the size of your solar panels.

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