I do not see any GFCI breakers anywhere. When the walls, floors, doors, etc are all conductive surfaces, should not GFCI be paramount?
I think most electricians on here are not concerned about him smoking his system but, when you have a child getting shocked, it’s a whole other level.First, this is DIY.
Second, it is pretty arrogant of you to assume nobody here knows anything about this sort of problem.
Many here have practical experience and more than enough education to know what they are saying. I know I wouldn't give advice in here until the OP posts back pictures and a wiring diagram so I wouldn't give a wrong answer.
I can see your point that the OP should carefully consider the advice he is given before doing things. And be double careful about testing before letting his famliy near. But it doesn't take a certified master electrician to track down an issue like this.
It doesn't matter with an autotransformer. The input and output are the same. (Other than the neutral)In this diagram I found, there are zero connections to the panel EXCEPT what comes out of the auto transformer.
In OP’S pictures, he has output of the growatts connected to the same panel as the outputs of the auto transformer.
Why?
Isn’t an autotransformer just a single winding? Are A and B connected internally in the drawing above?In this diagram I found, there are zero connections to the panel EXCEPT what comes out of the auto transformer.
It would be a good idea, in a metal shipping container sitting on the ground.I do not see any GFCI breakers anywhere. When the walls, floors, doors, etc are all conductive surfaces, should not GFCI be paramount?
No, current induction is how an autotransformer works, and it’s all happening inside the case. Occam’s Razor says the ground bond in the (inappropriate) inverter is the root cause, as others have noted.Possible for current induction taking place with the autotransformer?
The DIY community will never be restricted to grown adults playing in an isolated shed.I think most electricians on here are not concerned about him smoking his system but, when you have a child getting shocked, it’s a whole other level.
Could you use a multimeter to verify which pin on the jumper power cord actually connects to shipping container? If the ground pin was making contact with container it would not be possible to shock you. Something else must be going on.This metal box is screwed to the shipping container thus making the whole shipping container as part of ground as well.
The problem is that the "ground pin" isn't bonded to neutral.Could you use a multimeter to verify which pin on the jumper power cord actually connects to shipping container? If the ground pin was making contact with container it would not be possible to shock you. Something else must be going on.
In this diagram I found, there are zero connections to the panel EXCEPT what comes out of the auto transformer.
In OP’S pictures, he has output of the growatts connected to the same panel as the outputs of the auto transformer.
From description so far it appears that inverter chassis is floating. Ground rod only connects to isolated ground bar (right side neutral bar uncoupled from left side neutral bar) on right panel and that only connects to 120v outlet ground and nothing else.In this case, everything that should be a ground is actually bonded to L2.
There's no relay in the Growatt autotransformer.Your diagram is Solar Edge auto-transformer, with external transfer switch between Solar Edge and Growatt + auto-transformer.
No grid is shown. I don't know what this system is supposed to do.
OP's system uses GroWatt auto-transformer, which has relays inside so to transfer load so auto-transformer doesn't go parallel with grid (at least in typical use cases). It's breakers should open to protect against overload, and disconnect loads to prevent power with lost neutral. Not sure if OP's system implements that.
The problem is that the "ground pin" isn't bonded to neutral.
In this case, everything that should be a ground is actually bonded to L2.
And the neutral is connected to the ground rod. (Earth)
This is why there is 120v between the container and Earth.
I thought something like this would turn up, seemed very suspicious, but I had no idea or experience with this model being European 230v system. Good catch!Do you have a neutral/ground bond anywhere? Before the transformer?
Double and triple check that you don't have a Line and Neutral reversed.
I might have said it backwards.From description so far it appears that inverter chassis is floating. Ground rod only connects to isolated ground bar (right side neutral bar uncoupled from left side neutral bar) on right panel and that only connects to 120v outlet ground and nothing else.
View attachment 207028
From description L2 is not connected to earth. 1st picture in this post says ground wire passes through the conduit that goes through inverter 2 but does not make contact. It connects to right panel. Autotransformer neutral is also floating.L2 is connected to earth and neutral is connected to the container.
The biggest problem is that there are two different versions. That have the same model number. And it's not widely known.I thought something like this would turn up, seemed very suspicious, but I had no idea or experience with this model being European 230v system. Good catch!
I don't think a ground fault breaker would have helped in this instance anyways as it wouldn't have had the function.
I have seen guys order this stuff online and then realize its not intended for north America. None have ever made it this far with the install, probably because of the transformer required.
1st picture has notation of ground rod connected to inverter.From description L2 is not connected to earth. 1st picture in this post says ground wire passes through the conduit that goes through inverter 2 but does not make contact. It connects to right panel. Autotransformer neutral is also floating.