If as 36coup suggest as a possibility, the unit has an internal problem, then all the other discussion is moot.
However, even though this has really been said, let me re-state in my words.........maybe it will register differently.
First, I want to examine this: "The house and barn are 200 feet away and the electrical panel in the barn has no ground rod currently. Also the ground and neutral connections are combined as there is no place to separate bars. It also does not change if you take out the bonding screw in the panel. It could very well be a connection problem in the ground rods, but the house still only has one rod. I know 2 other area farmers that have had the same problem and never got it corrected either."
3 wires to barn are hot(line), neutral, & ground...right?
"Ground & neutral combined with no place to separate gnd & neutral bars"
IF this is in fact the case, it has been said that it is wrong & it is wrong & it may very well be the cause of your problem. Why? Because any power drawn from the house must travel thru a loop consisting of the hot(line) to the barn, thru the load and return to the house (properly thru the neutral), but since your neutral & ground are not separated, it returns thru the ground AND neutral...note: gnd & neutral are simply in parallel. This is not good. Because any voltage drop in the neutral now shows up on the safety ground of every appliance in the barn, including all 3 grounded water heaters. IF neutral & ground were properly separated, there would be no load currents in the safety ground & I bet your shocking problem would cease.
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