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220 VAC Diode Functionality

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millner(at)me.com
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Posted: Sat Aug 08, 2015 3:41 am Post subject: 220 VAC Diode Functionality

On 8/7/2015 7:53 PM, Bill Putney wrote:

 	  Quote: 	
		   If you are really talking about running a generator with the 

 commercial mains, DON'T DO IT!


	


In general, Bill is of course correct, as he generally is. However, 

there is a safe way to do this... with a very robust reverse current 

relay that prevents a watt from ever exiting your on-premises system 

toward the mains.



There are certification requirements, too, from the utility, which one 

ignores at one's own risk of course. But it can be done safely, and even 

legally... but it's not super inexpensive.



Easier is an isolation relay that allows EITHER mains power or 

self-generation. But this is not a bumpless transfer (power fails and 

then is restored...)



Paul

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