When my solar panels are sitting in the sun all day but the battery is full, where does the extra power go?

Question

Edit: I should mention it’s a boat system so it’s not grid tied

In: 510

Answer 1

I live in a Campervan run only on solar power.
I have noticed that when I am in a place or a country where the ambient temp reaches 30-40°C the solar panels seem to be noticably less efficient than if I am in a place where the temp is lets say 20°C.
I am talking about a charge difference of about 50-100w, in total I have 840w worth of panels.

Does anyone know of that is in fact true or just in my head?