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Specifications for switch?

whjohnson

I don't generally touch anything to do with solar kit but have been asked to come up with a method whereby an immersion heater can be switched from mains to solar or solar to mains.

A straight forword solution is simply a change over switch with 2 supplies in and one supply out to the heater, but because one of the input supplies is coming from solar - post-inverter so mains voltage - I would like to know if I can use a conventional change over switch or are there some special requiements for switching the mains output derived from a solar supply?

Comments welcome

Parents

  • I had a quick search and found that immersion control products exist that could divert energy to the heater when there is sufficient solar being generated. However, I feel like this problem requires more complex controls than what has been described. i.e. if the heat pump requires the additional hot water but there is insufficient solar to operate the immersion; what needs to happen?

  • in reply to Shaun Scholes

    What needs to happen is that someone can turn the immersion heater from solar to mains electricty when required, and then back again when the demand for hot water has fallen back to within th ability of the heat pump to provide it.The instances when demand is exceeded are few in number but do happen at peak times during the spring/summer months.

    There are 6 mixer showers coming off the system at present! And that is before we factior in DHW for the kitchen sink and other applications.

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  • in reply to Shaun Scholes

    What needs to happen is that someone can turn the immersion heater from solar to mains electricty when required, and then back again when the demand for hot water has fallen back to within th ability of the heat pump to provide it.The instances when demand is exceeded are few in number but do happen at peak times during the spring/summer months.

    There are 6 mixer showers coming off the system at present! And that is before we factior in DHW for the kitchen sink and other applications.

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