Growatt no ac out

[Axlsavage]

Hello, I have a Growatt 3000 24v. When I first set up the system with batterys and ac in, I had ac out to my power strip.
Then today I finally had a chance to hook up a 200w 24v rich solar panel. The unit showed that it was charging via solar
giving me 36v. So then I turned on the power strip and nothing. So I put the power strip back together and plugged it
into the wall and it works! So the power strip is good. Im trying to figure out why I have no ac out. No codes and the one
breaker at the bottom of the unit is not tripped. Can anyone offer any ideas as to what might be happening? Settings or ???

Edit: I forgot to mention that I disconnected the solar panel to see if the ac out would start working, it did not.

Edit: I am running 4 SOK 12V 100ah Lithium batteries. 2S2P configuration

Thanks

 

[Axlsavage]

Update: I get ac out when the unit is plugged in to shore power.

 

[John Frum]

What is the voltage as measured at the growatt system side dc terminals?

 

[Axlsavage]

What is the voltage as measured at the growatt system side dc terminals?

Im sorry noob here. Where are the side dc terminals?

 

[John Frum]

Im sorry noob here. Where are the side dc terminals?

The big cables between the growatt and the battery.
At the growatt terminals.

 

[Axlsavage]

27.1 Volts

 

[John Frum]

27.1 Volts

Ok if you disconnect the mains you should hear the transfer relay click.
Do you hear that?
Can you post a picture of the transfer relay?

 

[Axlsavage]

Ok if you disconnect the mains you should hear the transfer relay click.
Do you hear that?
Can you post a picture of the transfer relay?

When you say Disconnect the Mains, Do you mean unplugging it from the wall?

 

[John Frum]

When you say Disconnect the Mains, Do you mean unplugging it from the wall?

I thinks so.
I mean de-energise the ac in.
You should have a light on the ac-out and I expect you will see...
The light go out
and you should hear the relay click at the same time.

 

[Axlsavage]

I thinks so.
I mean de-energise the ac in.
You should have a light on the ac-out and I expect you will see...
The light go out
and you should hear the relay click at the same time.

The green ac/inverter light is no longer solid. It is now slow flashing.

 

[John Frum]

The green ac/inverter light is no longer solid. It is now slow flashing.

I have no idea what that means.
I know how this hardware works in a generic way but I don't know the growatt specifics.
Perhaps you could look at the manual and tell me that that means.

 

[Axlsavage]

When its plugged in to shore power the inverter light stays solid. When I unplug from shore the ac light
flashes. Thats about all all it says. But the inverter is on either way. As long as there is battery or solar.
I hope this helps.

 

[John Frum]

When its plugged in to shore power the inverter light stays solid. When I unplug from shore the ac light
flashes. Thats about all all it says. But the inverter is on either way. As long as there is battery or solar.
I hope this helps.

If the inverter is on and the relay switches you should have ac out.
That means 120VAC between hot and neutral on the ac out.
Be careful when you measure 120VAC can kill.
Did you hear the relay click?
Can you visually inspect the relay?

 

[Axlsavage]

Cannot visually inspect relay but it does switch over, I can hear it. The only thing I can think of is, I must have a setting wrong.
There is a big menu with lots of parameters to change. I must have something set to low or to high
Pic of my setup....

 

[John Frum]

Cannot visually inspect relay but it does switch over, I can hear it. The only thing I can think of is, I must have a setting wrong.
There is a big menu with lots of parameters to change. I must have something set to low or to high
Pic of my setup....

Check the low voltage disconnect.
May not be named that but that will be the functional description.

 

[Axlsavage]

Check the low voltage disconnect.
May not be named that but that will be the functional description.

For a 24v system, what do you suggest as a good low dc cutoff?

 

[John Frum]

For a 24v system, what do you suggest as a good low dc cutoff?

Depends.
If I had to pick one blind I would say 24.8 volts.
But if you have a diy battery I suggest you do a test.
Discharge at a representative rate and find out the pack voltage where your weakest cell starts to diverge.
What is the lvd currently set to?

 

[Axlsavage]

Its set at 24.8v. I just lowered it to 23v to see what would happen. My ac output started working.

 

[John Frum]

Its set at 24.8v. I just lowered it to 23v to see what would happen. My ac output started working.

there is probably a complimentary low voltage disconnect resume parameter.
What is it set to?

 

[Axlsavage]

there is probably a complimentary low voltage disconnect resume parameter.
What is it set to?

That I dont know. But I will look in to it.