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> Dpdt Relay For In House Lighting Circuit
makourain2
Posted: September 21, 2010 01:55 pm
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the relay will switch between my inverter i have running on batteries and the wind turbine and then when/if the batteries get too low and the inverter turns off from low voltage, the relay will change back to the mains power so i dont have to live in the dark while waiting for the wind to pick up.

question is, can anyone suggest a good relay to do the job? i have 9 lights in my house; 1 fluro tube and 8 regular fluro lights that they replaced incandescents with.
most of them are 11watt.
i have a 150watt square wave inverter that should be able to handle the job no problem.

http://www.dse.com.au/cgi-bin/dse.storefro...duct/View/P8031

i was thinking of this relay here, what do u guys think?
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GPG
Posted: September 21, 2010 02:08 pm
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The relay has a 12VDC coil.
The mains should be holding the relay, not the inverter.
Get a small C/O contactor with an auxiliary contact for activating the inverter.
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tekwiz
Posted: September 21, 2010 07:58 pm
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QUOTE (GPG @ September 21, 2010 05:08 am)
The relay has a 12VDC coil.
The mains should be holding the relay, not the inverter.

Not if the inverter is meant to be the primary power source.
The scheme should work, & you need to size the relay to the current capacity of your mains fuse/breaker.
If this is meant to be a plug in device, then include a fuse & size it & the relay to your desired load capacity. Include a generous safety factor.
For 150W inverter capacity, I would use a 2 amp fuse, & a 5 amp or larger relay. Larger relays would tend to last longer in this application.


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