It's not the presence of the house is what's important but non 0 distance between the rods- any such distance would make rods under different potential during the strike due to potential gradient (those concentric circles on the graphic). Then if both wires coming into anything you might get tens of kV difference between them. Bonding directly avoids this problem and all your equipment gets under the same potential being connected to a single point.
Share grounding rod in PV/Mains hybrid?
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The odds of me understanding grounding configurations are about as good as me being struck by lightning. How can all my stuff be grounded to a single point when that point itself is bonded to another point, the second rod, 6 feet away. Unless the entire 6' x 8' bonded structure is considered one point. What is the "point"?900W, 40A MPPT, 230AH FLA,24V Samlex 1500WComment
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The odds of me understanding grounding configurations are about as good as me being struck by lightning. How can all my stuff be grounded to a single point when that point itself is bonded to another point, the second rod, 6 feet away. Unless the entire 6' x 8' bonded structure is considered one point. What is the "point"?
As opposite to this consider running separate wires from each of your rods and connecting them to your equipment. In case of the strike equalizing current will come to your equipment first and then go back to the second rod. This is dangerous as it can create significant voltages along its way now inside/on the case of your equipment. We're talking of short burst of current in possibly kA range capable of creating voltage spikes in kV range.Comment
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It is sinking in, thank you. I think i was concerned about my general system grounding, and not thinking about lightning protection. But it sounds like I may have both, to a degree, with the dual rod setup depending on where lightning strikes.
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