Originally Posted by irwin37
Hate to say but it will not work, your PWM charge controller only switches the panel voltage on and off, it does not lower the voltage,
If the PWM controller was rated to a high enough voltage it could be used with higher voltage panels
without any risk of damage to the battery or panels.
Higher voltage panels can even be directly connected to the battery in an emergency
if your controler fails. The battery will limit the system voltage.
Without a controller you need to manually disconect the panels from the battery as the battery becomes charged, and the voltage level rises above the absorption voltage (usually about 14.6v). If you don't do this the battery will be damaged, but it is a good trick to get you out of trouble if your controller fails. Without the voltage conversion of the MPPT the output will be less, but you will at least get some power.