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We discuss the difference between solar panels that have 60 cells, or squares, and 72 cells. The 60 cell solar panels were originally designed for grid tie solar systems, but thanks to MPPT solar charge controllers are now also used in off-grid solar systems. The 72 cell solar panels are also known as 24V panels, as they were designed to charge a 24V battery bank. With new codes and technology, they are now also being used in large grid tie solar systems.