Gohodo Victor

Its A Grounded DC Cable And A Thorough Check Of Your System Should Reveal, A Braized Cable, MC4 in water or i contact with moisture quire a few points to check

On Videos They Say Its Not Advisable But I Have Installed A Few Units With The Aux Port Paralleled And Never Had An Issue

Sunsynk Is Fully Compatible With The SolarMd But Not Really Sure With The New Sphere Brand Its Not On The Approved Inveter List, Sungrow Is Also Compliant With The Solar MD And In The Cape Heroldt, Segen Do Stock Them Would Advice Sunsynk With Sunsynk Batteries, Solar MD, BSL Batt Deye With Deye 6kwh Batt, Volta Stage 1,2,3(the cheaper alternative to sunsynk, perfomance is almost the same other than the SoC drift that is usually soughted out with a firmware update)

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It's Derating The Inveter Maximum Output Current, Helps Reduce The Number Of Returned Products Due To Overload Damage, If You Have High Power Loads You Can Put Them On The Non Essential Circuits, You Rarely Have To Draw As Much At Any Given Time Anyway

Ideally The Voltage Dip Is Normal, When Your Panels Are Not Connected You Are Measuring The Voc ( open circuit voltage) the moment you connect a load you are now measuring the Vmp It Would Have Been Normal If The Voltage Variation Was Logical But 400-80 is too extreme, You May Be Using Kaak Panels Switch Off The Inveter Output And Measure The Voltage Without Any AC Loads, If It Dips Too Much You Should Consider The Possibility That Your Panels Are Not Good Enough