I think you just use an automatic transfer switch similar to those used for back up generators.  We are looking at one for backing up a community well pump that will transfer to a multimode system if the utility drops out. Chris

On 3/19/2019 10:54 AM, Mac Lewis wrote:
Hello Wrenches,

Does anyone have experience with a 200A outdoor transfer switch that will automatically seek voltage?  Meaning that if priority voltage source (grid) isn't available and second source is available it will switch to it with no external communication?  We are trying to do a whole house backup, and critical load panel isn't possible.  This may be common, I just haven't done it.

Thanks in advance

--



Mac Lewis

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"Yo solo sé que no sé nada." -Sócrates

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