My understanding is that is reason for 2 MPPT's, is MPPT1 and MPPT2 work independent of each other.
It is better to keep the 2 strings on the MPPT 1 as close as possible, but string 2 and 2.1 on MPPT 2 can be completely different from MPPT 1.
This is what makes those home made DC control boxes so dangerous when connected to Sunsynk inverters with dual MPPT's.
There should be a separate DC control box for each MPPT and there should be a 4 pole DC isolator in each DC control box, isolating both strings, which should also be a metal box, considering they have been identified as a fire risk.
There should never be power on the bottom of an main switch/ isolator, ever. I leant the hard way.
The 8 kw Sunsynk 2+2 in the Sunsynk manual identifies as MPPT 1 (with 2 strings) + MPPT2 (with 2 strings)
The 12 kw 3 phase unit has 2+1 MPPT 1 2 strings and MPPT 2 (only 1 string)
I am sure this confuses a lot of people, like the 50 amp pass through current, very few people understand what the pass through current is all about.
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