Creates a new solar system design for a project with specifications and performance data.

Business Context:
Solar designs define the technical specifications and performance characteristics
of the proposed solar installation, including system size, equipment selection,
and energy production estimates.

Design Creation Process:

1. Layout Planning: System size and equipment configuration
2. Performance Modeling: Energy production and shading analysis
3. Equipment Selection: Modules, inverters, racking, and storage
4. Optimization: Balancing cost, performance, and aesthetics

Required Design Data:

• System Size: Total DC capacity in kilowatts
• Performance Metrics: Annual production and system offset
• Shading Analysis: Annual Solar Access (ASA) percentage
• Design Identity: Name and source system

Primary Design Logic:

• If isPrimary=true: Sets this as the active design (others become secondary)
• If isPrimary=false/null and no primary exists: Becomes primary automatically
• If isPrimary=false/null and primary exists: Becomes secondary design

Integration Sources:

• Manual Entry: Basic system specifications
• Design Software: Aurora Solar, Helioscope, PV*SOL
• Site Analysis: Scanifly, Sunobi integration
• API Import: External design tools and platforms

Common Use Cases:

• Initial system sizing and layout
• Design import from engineering software
• Alternative design scenarios
• System optimization iterations
• Customer presentation materials