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Scenario at my home: In my home, refrigerator, washing machine etc and other heavy duty appliances(16A current) and lights and fans are connected to the same power line. It was a mistake done during house construction and we realized it much later. Because of this I can't use a backup power supply like Inverter when grid power goes off as the inverter can't supply enough power to run refrigerator or washing machine.

I am looking at options to solve this problem. I want to use an inverter to just run lights/fan when grid power goes off. Refrigerator should not get power during this time.

I thought of getting it rewired so that light/fans and refrigerator are on different power lines. But this is difficult.

So I am looking at options. Any help is appreciated.

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  • Is everything on the same circuit breaker? – drtechno Oct 4 at 14:11
  • Where are you on this planet? Are you manually flipping a switch or moving a cord over to change over to inverter power, or does the inverter kick in automatically when the power goes out? – ThreePhaseEel Oct 4 at 23:12
  • Yes, everything on the same wiring and same circuit breaker. – Shashi Oct 4 at 23:56
  • Nothing is connected to the backup power now. – Shashi Oct 4 at 23:58
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You could look into home automation techniques. Appliances can be controlled with WiFi, Bluetooth, powerline communication, or even a wired control connection with low-voltage control wiring routed on wall surfaces. There is a lot of general information available on the internet. Look at this Wikipedia article and follow links to other articles you will find in the article. There is also a lot of home automation product information available on the internet. If you want to design something yourself, search for do-it-yourself (DIY) articles about home automation.

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You can put the things you want to have a power backup on a new subpanel fed from your existing panel. Then you can equip the new subpanel with the generator feed with the proper lockout features to prevent backfeeding.

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