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How to build a hybrid solar/wind energy harvester?

Investigating the Wind-turbine to dump load switching – part 3, other alternatives

An alternative relay we have not looked at, until now, is the latching or bistable relay. This kind of relay will only use power when changing state from open to close or from close to open. Also, it keeps its last state. Those properties could be interesting, because one of the problems we face in […]

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Investigating the Wind-turbine to dump load switching – part 2, going the PWM route

In part 1, we talked about the ‘contactor’. Relays also use power, and in this particular case, the relay coil could draw up to 2 watts according to its specification. In order to save power, there are a couple of things we can do. Using PWM is one of them. Every relay coil has a […]

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Investigating the Wind-turbine to dump load switching – part 1

The (most obvious?) switching solution would be a high-power relay. In a previous article, we already did an experiment with a Solid State relay (and we will continue to do so). Now we will look further into the ‘contactor’. The ‘kit’ we ordered  from www.iacs.co.uk (via Ebay) is a relay board with optical isolation (to […]

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The relay

Introduction A relay – in this context – is an electronic switch and can be controlled by micro-controller logic. There are different types of relays, with different pin configurations. A 4-pin relay can be OFF (not conducting current) or ON (conducting current): 2 pins are powering and thus controlling the relay and the other 2 […]

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