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

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

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So I have a further question/questions. A few years ago I got into wind instead of solar(I wish I went solar instead because looking back it seems like it would be a lot cleaner😭 dear god all the oil and grease I had to put up with) my question is are there any advantages to cooling solar panels (water cooling/passive cooling of some sort) or is heat a part of the production cycle like do they need to be at a certain level of heat to run optimally. Furthermore if you did have some type of switch set up would you be able to easily be able to make it to where when you are at full capacity would you be able to set it up to where it can switch over to the grid or would it require a large power conversion system: convert dc to ac through converter of some sort then through filter capacitor. Also please feel free to grill me on the process it’s been a while and I apologize for any wrong info I’ll be more than happy to edit my response accordingly. Summary: would it be easy to set up a switch to offload the excess power to the grid or would it require larger scale power conversion. 😁 thank you for adding more info/questions to the eli5 page

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