How to ground SunnyBoy 6000US inverters?


I've been trying to understand the instructions for wiring up a pair of older sunnyboy 2008 6000us inverters to a 10KW GT Residential picnic shelter about 35 feet away from the main 200a home panel. I thought I was supposed to have an 8' long grounding rod at the solar panels which was attached to the solar panel frames. But these instructions seem to suggest I need to run the 6awg grounding cable 35 feet back to each inverter??? My main concern is that the inverter's GFPD will work. Can anyone help me with correct wiring.
I currently do not have any wires attached to either A or B of these terminals. I have them grounded at the picnic shelter like photo shows.

Comments
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I suggest 6 AWG as a minimum for grounding to a ground rod/system lightning grounding.
"Real/Professional" lighting grounding systems (lightning rods, ground rods/plates, etc.) can use much heavier/braided cables.
-Bill
-Bill
The point is if lightning does hit, we do not want to get it into the home any easier than possible. We do want the advantage of everything being at the same potential to not attract the strike. There are many opinions on all of this. Mine is born out of good experience for 100's of offgrid homes. For grid apps it is what the inspector wants.
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