Thanks lads for the deep dive into this stuff. I was lisening recently and totally agree nobody knows their way around data sheets. I always figured out my string voltage by, the number of panels times Voc + (Noc times 25) so this allows for the voltage at -5 on a bright day. But Sigen tech support said just use STC. Are we being falsed into repetition?
Regarding paralleling strings on roof then finding it may potentially exceed the possible max isolator current limit... Why not consider then running two series strings to a 4p isolator, THEN parallel the strings AFTER isolator eg 2x 14A series strings, safely isolated on a 20 or 25A isolator, THEN parallel to create 28A & fed to inverter Obviously, this requires more cabling, but ensures isolator always switches a safer lower current within its range, even on a pure sunny day Plus lot easier to work/test/diagnose issues with 2 into 1 string if parallel connection itself is near inverter than up on the roof
Lots of options to use and tools in the bag! My concern with that would be a single point of isolation into an array MPPT but nothing clear labelling couldnt sort out.
Great video guys, spent most of Sunday afternoon looking up 2 input mppt to find nothing, then all is explained here👍🏼
Thanks lads for the deep dive into this stuff. I was lisening recently and totally agree nobody knows their way around data sheets. I always figured out my string voltage by, the number of panels times Voc + (Noc times 25) so this allows for the voltage at -5 on a bright day. But Sigen tech support said just use STC. Are we being falsed into repetition?
listened this morning and another awesome episode really helpful with spec a system design! and thanks Mark for revealing my secret 😅
🙌
No secrets are safe with me. Wait till I tell you Sams
@@TheRenewablesPodcast-bv8ieif its not the one I already know it must be a very big secret 😂
Regarding paralleling strings on roof then finding it may potentially exceed the possible max isolator current limit...
Why not consider then running two series strings to a 4p isolator, THEN parallel the strings AFTER isolator
eg 2x 14A series strings, safely isolated on a 20 or 25A isolator, THEN parallel to create 28A & fed to inverter
Obviously, this requires more cabling, but ensures isolator always switches a safer lower current within its range, even on a pure sunny day
Plus lot easier to work/test/diagnose issues with 2 into 1 string if parallel connection itself is near inverter than up on the roof
Lots of options to use and tools in the bag! My concern with that would be a single point of isolation into an array MPPT but nothing clear labelling couldnt sort out.