Thursday, December 15, 2011

DIY Backup Generator Connection


We had yet another power outage today. I waited about 20 minutes to see if it would come back on, then started the generator. That seemed like a good opportunity to do a short video and writeup about how I connect the genny to the wiring in my home, so here it is. Note that I said how I do it, not how you should do it. This information is presented for its entertainment value and should not be construed as practical advice. This can be dangerous and may even be illegal where you live. I feed the power from the generator into the dryer circuit of the house. This works pretty well because a dryer circuit is 30 amps at 240 volts, which is 7.2 kilowatts. The generator is 7.5 kilowatts and 240 volts, which is a nearly perfect match. One way to do it is to scavenge the plug from a dryer someone has thrown away, and connect it to a cable from the generator. When I need to connect the generator to the house wiring I can follow this procedure to connect the generator to the house: 1) Go to the service panel and switch off the main breaker. This is of utmost importance; never allow the main breaker to be on when the generator is connected. 2) Switch off the breaker that controls the dryer. 3) Go to the dryer. Unplug it and plug the generator connector into the dryer outlet. 4) Go outside and ready the generator for starting. Make sure the breaker is switched off. Check the oil, fuel and cooling water. Add fluids as necessary. 5) Start the generator and let it warm up. 6) Go back in ...

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