Yes, you can install solar panels flat, but they will experience a degree of energy loss without the slightest inclination toward the sunlight. Although it certainly is advantageous to have a roof that is inclined in the sun's direction, a flat surface will also do. . But then, amidst the hype, one question may linger: Can solar panels be laid flat on the roof? Well, we understand the appeal of flat roofs – they are cheaper, easier to install, and management is more affordable and straightforward. Recent advancements show flat solar installations generating up to 85% of tilted systems' efficiency in. .