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Old 09-24-2019, 11:55 AM   #7
Maerin
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City: East Coast
Country: USA
Vessel Name: M/V Maerin
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 825
It's a DC ground. ABYC requires it to be grounded to the DC ground point- buss, battery, not the engine, because then the ground path between engine and DC ground buss or battery is only the size of the ground conductor on the engine. As others posted, it can be one wire size smaller than the (+) conductor on the DC input on the inverter.

ABYC also requires this grounding conductor from case to DC grounding point on your battery charger.

It can pop on a survey, so on a new install, you're well-advised to include the case ground. On already installed gear, it depends on how thorough the surveyor is. Mine remarked that my charger & inverter had the case grounds, he typically finds them missing. So that's one surveyor who looks for them.
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