I'm installing an Eg4 48 volt 3 kw off grid inverter. in place of a 24 volt Magnum inverter. The system used lead/acid batteries that were recharged using a gas generator. As I was connecting the new Eg4 inverter, I noticed that the distribution panels ground bus bar was not connected to an earth ground. I have two questions. Shouldn't the distribution panels ground bus bar be connected to a grounding rod? And can I connect the distribution panel to a ground rod that I have installed for the pv panels? Or should I install a separate ground rod for the panel? Any help will be greatly appreciated.