<Solar Energy Sales Calculator> 
1. Solar Yellow - 
                            
                            #F6D02F
                         - A bright, cheerful yellow that evokes sunlight and energy.
2. Sky Blue - 
                            
                            #87CEEB
                         - A calm blue reminiscent of clear skies, promoting a sense of trust and reliability.
3. Grass Green - 
                            
                            #4CAF50
                         - A vibrant green that symbolizes growth and sustainability, reflecting the eco-friendly aspect of solar energy.
4. Earthy Brown - 
                            
                            #8B4513
                         - A grounding brown that connects to nature and adds a stable, earthy tone to the palette.
5. Soft Gray - 
                            
                            #D3D3D3
                         - A light gray that adds a modern touch and provides a neutral background to enhance readability.

This color palette is designed to convey the themes of solar energy, sustainability, and reliability, making it ideal for a calculator focused on solar energy system sales. The bright colors attract attention while the earthy tones provide a sense of stability and trust.

What specific elements do you want to highlight in your calculator? Do you have any preferences for the overall style (modern, classic, playful, etc.)?