Hi all,

I need some help making sense of this please. I sarted using solar assist and its just opened so much info to me, really great product. Here's what I am seeing happen, but I have no idea why:

1. Sun shines on panels, carries more than enough load and ends up loading batteries to about 85% (I assume it reaches float charge voltage and stopes?). Then solar stops charging batteries which I assume is normal as float Voltage has been reached. Then the weird part: at roughly 16:00 every day battery voltage drops drastically to 30% (see images). Why?  

 

Settings:

Battery type User

Charger source priority Solar and utility simultaneously

Shutdown battery voltage 46.0 V

To grid battery voltage 48.0 V

Back to battery voltage 50.0 V

Battery float charge voltage 53.7 V

Battery absorption charge voltage 54.0 V

Max charge current 60 A 

Max grid charge current 20 A

 

See images attached.

 

Edited April 13, 20231 yr by TheFran42

Do you have hubble batteries? More info is needed

Also what brand and model of inverter?

Your screenshots are badly cropped, making it difficult to interpret the graphs.

I assume in the last picture the yellow line represents your PV power, correct?

If yes, then at 16h your solar drops to zero. Not sure why this is, but probably your batteries are then taking up your house's load. 

I assume the blue line is the house load. It seems to be quite low, so not sure why the batteries are dropping so low. Are you exporting battery to the grid?

Edited April 14, 20231 yr by suds7162

Set your Shutdown battery voltage 46.0V to 43.5V

This was one of the things that frustrated me for a long time, until I finally saw the post below and it explained the % shown.

Coulombs Post

In short:

Take your Float Setting minus your (battery cut off + 0.2). Meaning your battery cut off needs to be 10.2V lower than your Float setting.

I did mine yesterday, Float 53.6V, Cut off 43.4V and now it displays correctly.

Yours would then be: 53.7 - 10.2 = 43.5V (cut off setting)

Shutdown battery voltage 46.0 V

To grid battery voltage 48.0 V

Back to battery voltage 50.0 V

Battery float charge voltage 53.7 V

Now there is a dip when solar early morning and late afternoon switches on and off. My guess is here and I will test it is to set the To Grid value same as the Float voltage, so that if Solar first is chosen, it falls back to grid, cause remember the SOL criteria:

   

So there it is clear - Your solar isn't strong enough and now the battery supplements, unless the battery level falls below the setting is #12, and for you to thus not experience ANY battery usage, setting it at the Float level should do this.

 

 

 

Try this?

Edited April 26, 20231 yr by Eurard

7 hours ago, Eurard said:

   

I use 01: SbU and am happy with.

On 2023/04/14 at 5:42 PM, suds7162 said:

Your screenshots are badly cropped, making it difficult to interpret the graphs.

I assume in the last picture the yellow line represents your PV power, correct?

If yes, then at 16h your solar drops to zero. Not sure why this is, but probably your batteries are then taking up your house's load. 

I assume the blue line is the house load. It seems to be quite low, so not sure why the batteries are dropping so low. Are you exporting battery to the grid?

Hi and thanks for the feedback @suds7162, how would I know if I am exporting back to grid? It would definitely make sense on the massive and quick drop of battery.


@Eurard Thanks so much foe this. I will give it a try. Makes sense what you posted. I just thought having battery cut-off so low is a bit dangerous for the batteries? I'll provide an update here after testing it.