Oversimplifying?
If you CAN re-aim your array to a less-productive patch of sky, then you could easily get rid of a few stray BTUs per second with a high-temperature pump and a patch of uninsulated pipe to put the heat someplace (ground, swimming pool, etc)
In other words, your controller's response to an over-temperature tank should be:
1. Re-aim array to reduce input of BTUs.
2. Activate "heat waster" pump to shed some BTUs.
3. Return to normal activity when "Safely" below overheat Temperature
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