How much does more does it cost to have battery that allows me to go offgrid and/or access its power during a grid outage?

How much does more does it cost to have battery that allows me to go offgrid and/or access its power during a grid outage?

Some batteries allow your home to still have power during a black out. Please note this is not a standard feature. If you would like this option, please advise your installer. 
 

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