OFFGRID & BATTERY CHARGING:  These are a genuine 24V panel and can therefore be used for battery charging with PWM regulators.  Use one in series for a 24V system, two for a 48V system etc.  They also work very well with MPPT solar regulators – on a typical 150 volt charge controller, you’d can have three panels in series

GRID CONNECT SOLAR:  These are often used in commercial solar applications; less so for residential due to their size.