I've seen some 48v inverters specs that would shut them off at 50v..
My 48v bank is up well over 50v in the middle of the night..
Of course, I hardly ever use back-up power.
Hard to say if you are going to damage your inverter. It might be best to keep an eye on it's temperature.
Just try not to run it up near max load, and it might work just fine.
If you do get a 48v bank, then you will have to re-wire your panels to supply the MPPT unit with 96 volts..
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