MPPT regulators have voltage and current limits. eg 100/30 is panel volts 100V, battery amps 30A.
The mppt algorithm controls the panel volts. Does the algorithm stop at 100V or can it look above 100V for the max power point and thus potentially overload and kill the circuit. Put another way, is there software protection at 100V in the mppt algorithm.
I ask because at present there is a tendancy to leave some freeboard between panel open circuit volts and regulator specification. Panels which have 100V open circuit volts would never expect to provide max power at 100V, always somewhat less. If connected while dark the regulator is never exposed to the panel open circuit 100V.
I realise there may be circuit constraints beyond the simple concept.
Not looking for a recommendation, just an explanation.