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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

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  • Is the inverter derived mains still on in a power cut ? If so then there are minimum isolation requirements, to meet (to make incredible,  the risk of feeding inverter power into an isolated street main and hurting the chaps working to repair it ). 

    If not then any double pole (I assume single phase, 4 pole if 3 phase) change over with adequate contacts and a rating that treats the 2 supplies at least as well as separate phases should be enough.
    There are some nice rotary ones out there.
    Mike.

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  • Is the inverter derived mains still on in a power cut ? If so then there are minimum isolation requirements, to meet (to make incredible,  the risk of feeding inverter power into an isolated street main and hurting the chaps working to repair it ). 

    If not then any double pole (I assume single phase, 4 pole if 3 phase) change over with adequate contacts and a rating that treats the 2 supplies at least as well as separate phases should be enough.
    There are some nice rotary ones out there.
    Mike.

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