Sol-ark Grid/load Ground wire size?

Diy student

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Joined
Nov 4, 2022
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What size and type of ground wire should I be using from my sol-ark 12k load breaker to my critical loads panel? What size and type of ground wire should I be using from my Sol-ark 12 K grid breaker to my main panel? Manual does not say.
Thanks for your help
 
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