Ground and Neutral bonding in mobile solar array.
I'm trying to work out some details here for a 3000W solar array mounted on a trailer. I am installing a Midnite Classic CC and Magnum MS4448-PAE inverter. This system will charge 8 x 224AH Fullriver 6V AGMs in series for a 48V battery bank.
I'm having difficulties trying to figure out the grounding system, as well as the ground/neutral bonding for this system. The reason for this difficulty is because this trailer will be see various different circumstances. Sometimes there will be a generator to charge the batteries in the winter. Sometimes it will be plugged into the grid to charge the batteries. Sometimes it will be a standalone system with no grid. Sometimes it will power a house. Sometimes it will power an event.
As per NEC, every AC system must have one place where neutral and ground are bonded. All the Magnum instructions have this happening in the AC main panel, which assumes my system will always be hooked up to an AC system. It won't always. Obviously, when I am hooked up to a main AC panel, I will have bonding in that panel. But when I am unhooked, I will then have no bonding.
Many inverters have an automatic bonding of the ground and neutral when unplugged from an AC power source. This is what I would prefer, and honestly, I would have thought that for such an expensive inverter the Magnum would have this feature.
Also, when hooked up to a generator, many generators have neutral/ground bonding. Will I just have to select one that has neutral bonding internally? I know some people make a bonding relay of some sorts to accomplish this too.
So, where should I have my ground and neutral bonded?
Should I swap inverters for one that has automatic bonding?
Also, I will potentially be driving a grounding rod when using this trailer at events (and not hooked up to the grid). This will be a pain in the butt, obviously, but I'd like it to be NEC compliant. I also may be using an existing grounding rod at an on-grid cabin where the trailer will usually be parked. Will this be a problem? Eventually this trailer may be the sole power source for the cabin.
I truly appreciate any feedback on this.
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