Originally Posted by mikedefieslife
You will never get 220w out of a 220w or two 110w panels anyway.
If you are cruising areas with reasonable solar insolation, you should find the maximum power output of each solar panel matches the rated output or at least very close to this number. It is not unusual to slightly exceed the rating with good installation
and quality panels.
These outputs will be seen occasionally and briefly, but they do confirm that the installation
and panels are performing as they should be. If you are not seeing these results then some troubleshooting should be undertaken.
Nearly all solar regulators can limit their current and therefore prevent damage if the panels deliver excessive current (but not voltage), but as well as throwing away power, relying on this self protection mechanism to avoid disaster is not a great policy in my view. MPPT regulators are not the most reliable devices and the popular Victron controllers use passive cooling
and run reasonably hot even when sized correctly.
Victron suggest limiting the 75/15 to a maximum of 220w for a 12v system.