As the title states, I have a house and a shop both with 240 feeders coming from the grid.
I have solar panels and a solar inverter in the shop.
The solar inverter is powered by panels, a 48v battery bank and the grid (fed from the main breaker box in the shop). It draws from the panels first, the batteries second and if the batteries' voltage gets too low it will pull from the grid to charge them. I have a 2 120 legs and a neutral coming from the main to the inverter and the same, 2 120s and a neutral leaving the inverter to the subpanel which is powering most of the shop as well as sending a 240 aerial to a subpanel in the house which feeds most of the 110 circuits.
Both the main breaker box in the house and the shop have ground and neutral combined. The subpanel in the house being fed by the inverter fed panel in the shop has an isolated ground bus.
I tried giving the inverter fed panel its own ground bus but the results were not good. Which later dawned on me, was probably because its not actually a subpanel.
So in the house, the solar fed subpanel is getting its ground to its isolated ground bus from the main panels shared ground/neutral bar which is I assume is attached to a ground rod outside.
In the shop the main panel doesnt seem to have a ground. Just a 3 cable feeder, the neutral being attached to the ground/neutral bar. Which I have a ground wire running from and going to the inverter's panel's ground/neutral bar.
My question is, is it dangerous that neither panels in the shop have any way to go to ground? Why did the main panel not have a ground rod? Should I install one?
I know this is a complicated setup and I truly appreciate any insight.