Hello, thanks for your answer.
Yes exact - overvoltage from lightning.
Can you reference me an DC Surge Protection (type) Devices that fits to my BlueSolar 250/70-Tr - i guess it shoud have a voltage of 250V?!
DC isolator shoud be no problem - my Setup is:
PV Panel, Fuse, Overvoltage Protection, DC isolator - so the DC isolator is protected from the fuse.
By overvoltage are you referring to overvoltage from lightning? You can ground the array.
You would need DC Surge Protection Devices for that. Example linked.
But as for panel voltage, 250v at minimum temperature for your location is the hard install limit for the mppt. You would need a pretty decent DC isolator for that as well.
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