5000ES + Autotransformer (my specific setup) input

Shale MacGregor · Jan 25, 2022

Off-grid, grounded with an 8' electrode to the main panel.
3x 5000ES (No screw, plan on adding insulation)
Victron Autotransformer 100a fed by inverter panels through 20amp circuit breakers
Main Panel fed by Autotransformer through main lugs

I am trying to see where this goes wrong. (The AT has a 100amp breaker built in, and temperature protection)

MakerMan63 · Mar 4, 2022

Is this setup working for you? in my shop I separated grid power out of the main breaker panel to its own panel with one 240v outlet for my 3hp air compressor or welder or normally just on solar and battery Signature Solar Growatt SPF 5000 ES w/ Solaredge autotransformer currently in use in my sort of off grid shop. I ordered here a couple weeks ago a Second SPF 5000 ES to help with the heavy loads. I have not received the second unit yet and since then I seen a lot of controversy over proper wiring of the solaredge autotransformer to the 5000ES so I ordered a Victron 100amp auto transformer for a safer setup. Sorry I can't be of much help looking for answers myself.

Shale MacGregor · Mar 4, 2022

It is working fine, I cant find any issues, no sneaky current, or anything.

MakerMan63 · Mar 4, 2022

Great to hear I just received the Victron auto transformer yesterday have yet to wire it up.

timselectric · Mar 4, 2022

Shale MacGregor said:
Off-grid, grounded with an 8' electrode to the main panel.
3x 5000ES (No screw, plan on adding insulation)
Victron Autotransformer 100a fed by inverter panels through 20amp circuit breakers
Main Panel fed by Autotransformer through main lugs

I am trying to see where this goes wrong. (The AT has a 100amp breaker built in, and temperature protection)

View attachment 81185

This is correct.

timselectric · Mar 4, 2022

For completely off grid.

MakerMan63 · Mar 4, 2022

Currently it's setup in my shop and I've got a plug-in on the Growatt input side and I can plug it into the 240v outlet (the grid) that runs from my house I never hardly ever use that. but it has been connected a few times.

timselectric · Mar 4, 2022

MakerMan63 said:
Currently it's setup in my shop and I've got a plug-in on the Growatt input side and I can plug it into the 240v outlet (the grid) that runs from my house I never hardly ever use that. but it has been connected a few times.

When connected to the grid, you will have created a ground loop. Be careful in this situation.

MakerMan63 · Mar 5, 2022

Even though I have purchased the US model without the ground screw from Signature Solar?

timselectric · Mar 5, 2022

MakerMan63 said:
Even though I have purchased the US model without the ground screw from Signature Solar?

If your loads panel has a n/g bond.
Yes

Shale MacGregor · Mar 5, 2022

MakerMan63 said:
Even though I have purchased the US model without the ground screw from Signature Solar?

Your load panel most likely has n/g bonded, the question then becomes is your setup bonded to its own ground or back to the main panel? After that it gets out of my comfort zone but a lot goes into the ground, neutral, electrode, subpanel, etc discussion.

timselectric · Mar 5, 2022

It

MakerMan63 said:
Even though I have purchased the US model without the ground screw from Signature Solar?

That has nothing to do with the n/g bonding. That just bonds a hot leg to ground, if not modified for US.

MakerMan63 · Mar 7, 2022

With your setup can 2 of the inverters be shut off during night time ?

timselectric · Mar 7, 2022

I believe that you can turn off the slaves and leave the master on.

Shale MacGregor · Mar 8, 2022

MakerMan63 said:
With your setup can 2 of the inverters be shut off during night time ?

Yes, as you turn them on they sync

MakerMan63 · Mar 10, 2022

I switch to the Victron 100AMP Autotransformer it makes a loader hum than the solar edge autotransformer which I could hardly hear. Should I worry it is wired as pictured above except with only one Growatt still waiting on the second unit.

timselectric · Mar 11, 2022

MakerMan63 said:
I switch to the Victron 100AMP Autotransformer it makes a loader hum than the solar edge autotransformer which I could hardly hear. Should I worry it is wired as pictured above except with only one Growatt still waiting on the second unit.

That's normal for a larger transformer.

MakerMan63 · Mar 11, 2022

Thank you for info Tim was kind of making me worry.

Shale MacGregor · Mar 11, 2022

MakerMan63 said:
I switch to the Victron 100AMP Autotransformer it makes a loader hum than the solar edge autotransformer which I could hardly hear. Should I worry it is wired as pictured above except with only one Growatt still waiting on the second unit.

Completely normal, not ideal for living spaces, both of mine do the same

abauti1 · Mar 16, 2022

If one is using only (1) 5000ES, can you directly connect the L1 and L2 to the transformer?

5000ES + Autotransformer (my specific setup) input

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