UK Solar inverter problem?

[Poppymac]

I'm hoping someone out there has come across this problem.
Just had -8 days ago- a 6k solar panel system plus 4.8k battery pack installed.
When the electrician left the batteries showed 20%full.
Next few days inverter showed producing 30kwh but batteries did not charge.
We normally use 8.5kwh per day, this was from readings taken off the grid meter over 30 days before installation. I also noticed that overnight, on the meter they installed next to the grid meter, it showed we were exported 0.2kwh to the grid when the solar was not produced.
Contacted the installer but they did not get back to us.
Eventually on the 5th day we had a video call and we noticed that the inverter showed our usage grew and waned in time with the production of solar, more produced more we used.
AHH I know what it is said the installation manager, turn the clamp on the red wire the other way round, it's because you've got an old style fuse box.
I did that and the battery started to fill =success I thought.
However, the battery fills but cannot be used.
If I turn the clamp back to its original position the battery discharges, but the same thing happens. My usage goes sky high and the battery discharges quickly.
I turned the clamp back after it dropped 30%, and that night the grid used 4kwh, the battery wàs full and it sent 3kwh back to the grid.

So now we have a full battery not using it, when the solaris not producing the inverter shows no usage.

We use IKwh from the grid overnight and send 0.2back to the grid overnight

Basically: inverter shows more solar more we use, even when we are only running the fridge and freezer
No solar no power used

Can charge the batteries but they can't he used
Using power from the grid not the batteries and sending to the grid overnight

Only asking here as the company are not getting back to me at all now

Thanks

I have photos but not sure I can upload them

 

[plugsandsparks]

That looks OK, if you turn on the kettle and oven, you should see it pull from the batteries

 

[Poppymac]

Yes that's not the problem. It does do that. It's at night. The batteries aren't used to run the fridge freezers. The grid is used. I'm hoping that putting it all through the house, then the batteries and not the grid will be used.

Up to now, since the emeter was replaced, the grid had been used throughout the night

 

[plugsandsparks]

At night i would expect the batteries to run down powering whatever is needed. As long as the batteries are flat before the Sun comes out, i guess it does not matter

 

[Poppymac]

At night i would expect the batteries to run down powering whatever is needed. As long as the batteries are flat before the Sun comes out, i guess it does not matter

Well exactly what I said to the installer.

We have full battery 4.8kw and it's not being used overnight. It discharges to say about 80% as we use the oven and watch TV when the solar is producing less.

At the moment I am using the oven and the solar is powering it along with Some from the battery, with alternating every second or so, using from the grid sending to the grid. Once the oven comes to heat, usage drops and the solar is producing enough .

Once we get only to using only the freezers and fridges it is powered by the grid even though the battery is still 80% full.

That's when the installer vtoldvme the battery wouldn't kick in if the fridge and freezers used less than .30kwh, which I find ludicrous to be honest. Bit sure I believe him.

So tonight I am hoping that as it's all routed to the house, then things will work properly.

See photos with oven on

 

[Poppymac]

Ok still no further forward. On a cloudy day we saw what happened. At 81% the battery powers the fridges and freezers ok. As soon as it hits 80%, the battery goes into 'sleep mode' and power source switches to the grid. No one knows what the problem is - anyone got any thoughts?

 

[plugsandsparks]

Can you take a pic of the display when it is in that state, i.e. your are clearly drawing power but the batteries are not contributing

 

[BXB]

I haven't had a chance to read this in depth, but the fact that the battery hits 80% and stops discharging could indicate that the depth of discharge setting is too high. Generally the installer sets the system so that 10-20% of the battery is not used, as even though lithium batteries can be discharged very low you buy quite a bit of extra life for them by allowing this buffer. The installer or Solis tech should be able to see the setting remotely. It could be as simple as they thought they were setting it to stop at 80% DoD and in fact were setting it to stop at 80% capacity.

Sometimes a factory reset and reconfigure can help.

Most likely something that has already been looked at, but thought I would mention it!

 

[Poppymac]

I haven't had a chance to read this in depth, but the fact that the battery hits 80% and stops discharging could indicate that the depth of discharge setting is too high. Generally the installer sets the system so that 10-20% of the battery is not used, as even though lithium batteries can be discharged very low you buy quite a bit of extra life for them by allowing this buffer. The installer or Solis tech should be able to see the setting remotely. It could be as simple as they thought they were setting it to stop at 80% DoD and in fact were setting it to stop at 80% capacity.

Sometimes a factory reset and reconfigure can help.

Most likely something that has already been looked at, but thought I would mention it!

Thanks both of you. I've got videos but I'm unable to attach them - only photos are showing when I try to attach.
With regards to the settings, it is strange.as before the new emeter was installed (before it gave up the ghost completely) for 12 days it was working perfectly. The system was installed on the 9th June.

I will try and take a photo tomorrow as the battery is at 83% at the moment and is powering the lights and fridges although I have to say that the power is jumping either to or from the grid constantly since we are using just battery power.

Can you take a pic of the display when it is in that state, i.e. your are clearly drawing power but the batteries are not contributing

 

[Poppymac]

Thanks both of you. I've got videos but I'm unable to attach them - only photos are showing when I try to attach.
With regards to the settings, it is strange.as before the new emeter was installed (before it gave up the ghost completely) for 12 days it was working perfectly. The system was installed on the 9th June.

I will try and take a photo tomorrow as the battery is at 83% at the moment and is powering the lights and fridges although I have to say that the power is jumping either to or from the grid constantly since we are using just battery power.

 

[plugsandsparks]

I see that the critical load is back (lightbulb), its got to be in the parameter settings as there is clearly a load for the batteries to contribute to, but it has decided it does not want to.
I would try and contact Solis again and see if they will dial in and go through the parameters.

 

[Poppymac]

I see that the critical load is back (lightbulb), its got to be in the parameter settings as there is clearly a load for the batteries to contribute to, but it has decided it does not want to.
I would try and contact Solis again and see if they will dial in and go through the parameters.

Yes thank you. The lightbulb is back as the installer asked me to do that last night as he said the reason the grid was jumping on and off was due to that, as the clamp couldn't pick up properly with the lightbulb off. Didn't make any difference whatsoever.

This morning both lightbulb and house are showing no usage. 1kwh -1.50kwh being produced by the solar. .84going to the battery, jumping from and to the grid .02 back and forward. So the solar power is being used by the house/bulb but is not showing on the screen.

Installer going to get in touch with Solis.

I did that last week but unfortunately the dongle isn't working. I didn't put the dongle on, the installers did. So Solis can't dial in.

Good fun eh
The system is great when it's working, just hoping this is the last hurdle