poly or mono for high temperature areas
1 Due to tighter spacing of the cells on Multi / poly crystalline solar panels compared to mono crystalline solar panels the higher efficiency of mono crystalline solar panels is negligible. 2  Multi / poly crystalline solar panels tend to perform slightly better at high temperatures than mono crystalline solar panels. Mono crystalline solar cells are slightly more efficient than poly / multi crystalline solar cells. 2  Poly / multi crystalline solar panels are slightly cheaper to manufacture than mono crystalline solar panels.