Engineering360: "Understanding solar charge controllers"

150 volt rated input voltage to MPPT controllers is not unusual.

Many designers will significantly over size the solar panel capacity connected to a charge controller. This is done to gain more power at the low sunlight parts of the day. Many if not all charge controllers will limit the amount of input current to the controller rating, so not a problem during peak sunlight. If you want more recharge time during suboptimal days, simply adding panels is an easy way to do this, without having to rebuild the entire system.