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I'm new to the forum, so I only recently discovered Will's video and blueprints utilizing the Renogy 50a DC-DC setup. Being that the video and blueprints are rather outdated, I'm having a hard time wrapping my head around the simplicity of Will's schematic and recommended components...

I know I'm a little late to this thread. I checked out your system schematic, and it is almost identical to my set up. 12x 100W panels (3S4P), 3000W AIO, number & amp hours of batteries, etc. The only difference I can see is your battery configuration. But the wire sizes are what caught my eye...