BB. wrote: »
What kind of inverter? True Sine Wave inverters can have one AC output grounded for "Neutral" and have a the DC negative grounded too (TSW inverters are typically isolated from DC to AC). You may earth ground / DC ground one lead on the AC TSW inverter or not--your choice.
MSW inverters, typically, if you ground reference the "Neutral" and DC ground one of DC power inputs can toast the inverter (MSW inverters are typically not isolated from DC to AC). Normally, you cannot DC ground reference the AC "Neutral" on MSW inverter because it will not work/cause damage.
There can also be an issue with Earth / Neutral Bonding--with larger generators, they typically also connect earth ground to neutral. If this is done both at the genset and the inverter AC neutral output--It can cause overheating in the wiring too...
As always, refer to the inverter manual for details.
There is also the Frame/Green Wire grounding for the Inverter. Typically all metal enclosures of electrical equipment should be earth grounded.
Lastly, Earth Grounding (green wire) of your DC battery bank. I would do it, at one location (as I remember, you have lightning in the area and it has hit your home before).
Typically, the DC Ground to Earth Ground is made on the battery negative bus connection.
You could make it at the charge controller or the inverter DC negative connection--although, the battery is usually the better choice because it is the heaviest wiring connection and more central to the entire system.
What you do not want to do is have two or more DC ground to Earth ground connections. If you grounded both at the DC negative of the Charge Controller and the DC negative terminal of the inverter, you could get "shared" current flow both in the DC power wiring and the DC earth ground. In many cases, the DC earth ground wire is smaller than the DC power cables--and you could overheat the earth ground wiring.
Also, in some cases, depending on how the multiple earth grounding to DC negative grounding were done, you may end up being more susceptible to lightning damage--another reason for only one earth ground to dc ground connection.
Probably way more than you asked about--but proper grounding is one of the more tricky wiring issues with DC/AC power systems.