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I sell/install mass notification products, sometimes they connect to line voltage, sometimes they use solar. With that being said, my systems are 100% battery driven, only using the utility or solar to trickle charge the batteries. When using line voltage utility to power the battery charger, our engineers obtain UL listing. When only using solar (no connection to the electrical grid) to trickle charge the battery, they do not obtain UL listing. These are low voltage circuits entirely. All bonding, overcurrent protection and so on is 110% done to code when installed. However, a MN electrical inspector recently made us pull a permit, and will not pass until it is UL listed. Nobody in the industry with standalone seperatly derived solar power systems get UL listing. IE: road side lighting, automotive battery chargers, marine chargers and so on. Under what grounds does something need to be UL listed when no utility is connected and the system runs only off batteries? AHJ deemed it necessary in MN and now what is the rest of the world going to do? any help or direction greatly appreciated.