Powering a critical load sub-panel [RE-wrenches]

[Jim Duncan]

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Wrenches,  
I have started a grid-tied PV installation with backup batteries for a 
rural residence. Now the owner wants to include a critical load 
sub-panel next to the main service panel. :>O
The equipment room, containing batteries, 2 SMA 3800s and 2 Sunny 
Islands is 160 feet from the house and the ground in between is rock. I 
really don’t want to send the rock saw back through the landscaping and 
yard to get power to the sub-panel. 
To power the sub panel off the main service is the goal but I need to 
find a way to lock out the rest of the non-critical loads while still 
feeding off that main service panel. The mains lock out must happen the 
same instant the Islands detect the utility loss and kick over to 
battery power. 
I know this must have been done before by lots of other installers but 
this will be a first for me. Can this be done without running any 
conductors, LV relay wires, or wireless signal, between the buildings? 
Thanks in advance.

Jim Duncan
North Texas Renewable Energy Inc
817.917.0527
ntrei at earthlink.net

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