Deye 12k does not consume from batteries ??‍♂️

[johnnash]

Here is my setup:

Deye 12k with 12lk panels.
I have no backup load.

During the day batteries are loading fine and the panel says 100%. When panels are not delivering power my batteries are not used and I don’t know what to change…

You can see that the load is there, but my batteries are not consumed at that state. And I see my power consumption from the grid (the counter outside of the inverter) shows are consumption from the grid…

Anyone an idea?

Also what means CT1 … CT3 (phases, where I connected the cable from my inverter behind my electricity meter) and LD1…ld3?

I would assume that my battery would be discharged by the sun of all three phases (ct1-3)

I am also wondering why it say Grid stand by when my electricity meter in my house tells me I am consuming from grid into my house…

Edit: I changed the load first to battery first as well but that is I guess just the order of charging during the day

 

[LydMekk]

Are your CT(s) installed correctly?
Edited the TimeOfUse table - which governs your battery use and grid/gen charging if needed?

 

[johnnash]

I mean at least the cts show a voltage on each line, isn’t that enough for the inverter to know that he needs to use the batteries?

 

[johnnash]

interestingly when I was running with selling first he sold the energy to the grid at night (using the percentages from the time table).
That means with the batteries is everything fine. The it has todo with load and inverter, so you could be right with checking the ct(s) …but as you see on the screenshots, all three are showing a voltage

 

[LydMekk]

The TimeOfUse is the only thing that makes it consume from the batteries.
I put my periods at 51.2V (20% for a 16S battery) at all times. Below that it uses the grid.
I also tick the grid charge on all periods in case of rain/cloudy days.
It wont charge from grid until they go so low that it is necessary.
Ofc all other charging is on auto from PV during the daytime.

 

[robby]

Are these LFP batteries and are they configured as 16S ?
If so the first thing I would be working on is why your battery is showing an SOC of 99% but the voltage is only 50.35V
You have two cutoff voltage points in the Inverter and I would be surprised if the main one is set to less than 51V.
So no matter what the SOC is reading it would not use the battery.

 

[johnnash]

Ok I guess I am missing some knowledge where I need your help understanding:

Attached the spec of one of my batteries.
I have 4 of these lithium batteries. Therefore I guess need to change the battery settings to 400Ah?

Do I have to maintain any of these voltages settings in the inverter, I guess percentages works and the inverter is reading the rest via the BMS cable?

How can I tell the inverter that I don’t want to sell my energy from the batteries at all only if batteries are full and my house does not need more energy?

 

[robby]

I am not familiar with that battery, the voltages look low for a normal LFP battery. Before I give suggestions do you have a link to the full pdf spec sheet.

 

[pepealba22]

puedo arreglar esto? Yo tengo un problema similar, durante el día si me sobra se me cargan las baterías y si el consumo supera lo que generan las placas entonces se aprovecha la energía de las baterías. Pero a medida que oscurece y baja la producción solar, las baterías entregan menos amperaje hasta que oscurece y aún con una carga en la batería, ya no se usa hasta que vuelve a salir el sol.