Growatt 3000tl lvm-es N-G screw

[MT off grid]

You can't test it, in this configuration.

 

[MT off grid]

Oh, maybe I'm just misunderstanding things, so to test it I need to be running grid for passthrough?

 

[timselectric]

Oh, maybe I'm just misunderstanding things, so to test it I need to be running grid for passthrough?

No, you can't test it with grid connected.

 

[MT off grid]

No, you can't test it with grid connected.

 

[MT off grid]

So how do I know the dynamic bonding is working (if I have it)

 

[ChrisG]

Make sure no wires are connected to AC IN and AC Out. With inverter off check continuity between G/N on AC out (should not be any). Turn inverter on and wait for the relay clicks on boot, if you have continuity between G/N on AC Out it's bonded.

 

[timselectric]

So how do I know the dynamic bonding is working (if I have it)

Turn off the inverter.
Disconnect all wiring.
Check for continuity between the output neutral and ground terminals.

 

[MT off grid]

Make sure no wires are connected to AC IN and AC Out. With inverter off check continuity between G/N on AC out (should not be any). Turn inverter on and wait for the relay clicks on boot, if you have continuity between G/N on AC Out it's bonded.

 

[MT off grid]

I will give that a try, what about when running two units in split phase

 

[ChrisG]

I will give that a try, what about when running two units in split phase

I'd verify how each unit is configured indpendantly first. For split phase, I'd call the vendor or manufactuer for guidance. I recall a video from Will and a few others with these types of inverters that one unit had to retain a bond but I think that was for off-grid (never an AC IN) only.

 

[MT off grid]

Make sure no wires are connected to AC IN and AC Out. With inverter off check continuity between G/N on AC out (should not be any). Turn inverter on and wait for the relay clicks on boot, if you have continuity between G/N on AC Out it's bonded.

 

[MT off grid]

I put the NG bond screw back into the unit, unit off I get continuity between N-G on AC output, I turn inverter on and I still get continuity on from N-G on AC output.

With the internal NG bond screw removed I get no continuity from N-G on AC output with the unit off but when it's powered on I get continuity on N-G on AC output

 

[timselectric]

It does have dynamic bonding.
Put the screws back in.
And hook everything back up.

Do not jumper the input neutral to the output neutral.

 

[MT off grid]

It does have dynamic bonding.
Put the screws back in.
And hook everything back up.

Do not jumper the input neutral to the output neutral.

 

[MT off grid]

So is the comment from ChrisG worded in a way that confused me or is he in reverse of what it should have said?

"Make sure no wires are connected to AC IN and AC Out. With inverter off check continuity between G/N on AC out (should not be any). Turn inverter on and wait for the relay clicks on boot, if you have continuity between G/N on AC Out it's bonded."

 

[timselectric]

First half is incorrect.
Second half is correct.

 

[MT off grid]

First half is incorrect.
Second half is correct.

 

[MT off grid]

So I should have continuity all the time? Unit off and unit on?

 

[timselectric]

So I should have continuity all the time? Unit off and unit on?

Yes, as long as it's not using the grid.

 

[MT off grid]

Yes, as long as it's not using the grid.