Large grid-tie with batteries [RE-wrenches]

[Jeff Yago]

We have a client that is totally renovating a 
farm house into a high tech home and converting an adjoining house 
(separate lot, separate meter base) into his business office. 
However, he wants to be totally "green" with 
as much grid -tie as possible, but this area gets some fairly bad 
snow/ice storms that can cause power outages lasting days. (he is at end 
of line).  He refuses to consider a generator, but is willing to install 
as much battery/solar as required. 

I am back to the old issue of wanting as much grid-tie as possible, yet 
still keeping a large battery bank available for back-up. He wants up to 
20kW of solar array, and back-feeding the "office" from the house 
service since it is currently on its own meter and we need as much load 
as possible at the house to offset the large solar array.  This would 
normally mean a row of grid-tie inverters and a high voltage array to 
keep down voltage drop but this leaves out the several days of battery 
back-up he demands. If I go with a stack of OutBacks and run the array 
around 72 volts to reduce voltage drop to the 48 volt battery bank, I 
am not going to have as much grid-tie sell back and will need a very 
expensive multi-cable run from array to batteries (275 feet).  

So, are we back to the ol combination of both inverter types and 
back-feeding the grid-tie through conventional inverters, and if so, how 
do we handle this much array?   This is at least 8 grid-tie inverters 
back-feeding through who knows what kind of battery-based inverter arrangement.

Any help would be appreciated.

Thanks, Jeff Yago



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