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       #Post#: 1680--------------------------------------------------
       Switching between solar and grid without tieing
       By: lawmaker Date: March 3, 2014, 3:47 pm
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       Something probably others have done, but I've just sorted out
       running the house lighting from solar chaged batteries and an
       inverter while still having the option of running from grid
       power. I've used a DPDT relay that when energised by power from
       the inverter, connects inverter power to the house lighting
       circuit. If that power runs out, or I chose to switch off the
       inverter, the lighting circuit instead connects bck to grid
       power. Inverter power and grid power are kept seperate and the
       little relay switches so fast that there is no perceptible dip
       in the lights. The relay only draws about 3 watts and currently
       the inverter is operated on a timer so is only cuts in as it
       begins to get dark.
       We have had several power cuts in my area due to winter storms
       bringing down power lines, this is more about resilience than
       cutting power bills....
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