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