[RE-wrenches] Storage Battery Permitting

[Jerry Caldwell]

Dear Wrenches,
Has anyone installed storage battery systems with no PV or other generation source?  I see no info on local building department websites about permitting storage batteries.  I've heard one person refer to battery storage as a "energy storage appliance" and allege that no permits are required for this.
I'm asking because I am bidding on a small battery only installation.  It's pretty much just a battery pack and an inverter.  The installation is a test installation for a company who writes software to manage battery installations.  The management of this company sounded surprised when permits were mentioned.
As always, any help is appreciated.
Best,Jerry Caldwell