3 Phase Solis inverter, Pylontech batteries and PV panels

[CalvinHobbes]

We have a 12Kw Pv system on a 3 phase supply, Pylontech batteries and a Solis inverter. We recently got the batteries hooked up but since then the behaviour of the system looks odd when displayed on the Solis Cloud app. The battery seems to start discharging as soon as it reaches full charge and dumps everything into the grid load. We get spikes indicating large power consumption randomly, even though there is no obvious cause, and always results in the battery depleting. Then there is the exporting to grid and charging at the same time!!!

(Pics attached)

The grid load figure just seems to be a sum of PV, Battery and Grid as opposed to the actual physical power usage. It's just the sum total of all three power sources!

We have asked the installer to look into it but I was hoping someone here may have a good understanding.

 

I understand that the CT clamps might be the issue but the installer insists they are correctly in stalled and not reversed.
Is the position or sequence in the meter cabinet critical???

(Attached a pic of the CT clamps in the meter cabinet with clamps circled in red)
 

Thanks in advance all

[Nickfromwales]

The CT clamps usually have an arrow under the bottom of the clamp body, but these have sometimes been put in arse-backwards in the factory, so that’s the first place we look if such an issue exists.

 

Your installer may be correct, that the clamps are installed as per the direction shown, but you need to reverse them to see if that rectifies any possible issue.

 

You’d try reversing L1 for a trial run of say 24hrs, then put it back as installed and then go to L2, and so on. 
 

VERY important you don’t lose track of where they are atm and which direction they currently face; you can mark these with Tippex or such to help out.

[Dillsue]

First screen shot looks fine with 8kw from your battery plus 4kw from the grid feeding a 12kw house load. We're you using that much at 18.43? If those figures are correct then it's hard to see how the CT clamps are the wrong way round

[CalvinHobbes]

We weren't using that much!
And that figure seems to fluctuate dramatically despite there being no identifiable reason for the grid load displayed in the app.

What happens is that the battery reaches full charge and then immediatly dumps all the power again into the grid load despite their being nothing to justify the figures displayed.

The heat pump is not running, we not charging an electric car and the electrician couldn't work out why it would be indicating the readings.

[Kelvin]

Is there any automation available within the app?  Or possibly a setting that tells it what to do with the battery in certain circumstances like a discharge priority? 
 

For example, I can configure my system to dump the battery to the grid (export tariff) then charge it back up at the cheap rate. However it’s dependent on me entering the correct figures and TOU. 

Edited 10 hours ago by Kelvin

[Dillsue]

1 hour ago, CalvinHobbes said:

We weren't using that much!
And that figure seems to fluctuate dramatically despite there being no identifiable reason for the grid load displayed in the app.

What happens is that the battery reaches full charge and then immediatly dumps all the power again into the grid load despite their being nothing to justify the figures displayed.

The heat pump is not running, we not charging an electric car and the electrician couldn't work out why it would be indicating the readings.

I think the "grid load" is your house consumption, hence the picture of a house. Have you got a clamp on multimeter/ammeter that you can verify what's coming and going to the battery/grid/house and check your measured readings against what the app is showing??