Yes, you’re typically required to have a permit for off-grid solar. Although you don’t have to submit an interconnection utility agreement, a building permit is still mandatory.  Although you won’t connect the system to a local utility grid, it still needs to pass inspection to ensure sound structural engineering and fire safety.  Your off-grid solar system must pass various building electrical codes to ensure the power is safe and sufficient. Standard off-grid systems should meet the following regulations:  • Solar panel placement guidelines  • Standard domestic wiring requirements  • Auxiliary power generation requirements  • Power storage and conversion guidelines  • DC minimum wiring requirements  Code requirements will vary by county and state. Check with your city or county Building Inspector’s office for a complete checklist.