New Givenergy battery and Zappi charger - odd issue

I have had my Zappi over a year and it worked exactly as it should when charging my car with any surplus solar generation. The Zappi has a CT clamp at the meter box and a CT clamp on the solar generation

Then 5 months ago I had my Givenergy battery installed. The installer placed another CT clamp within the meter box during this installation.

Now finally in the past few weeks I have been generating enough surplus solar to charge my car once the battery has been charged to 100%. (My Zappi is always set to charge by surplus solar only - Eco++)

This is where an issue occurs from time to time. Once the battery is full the Zappi then takes all the surplus and starts charging the car. But sometimes I am finding that not only is the car getting the solar surplus but also some chrage is being taken from the battery. This doesnt happen all the time though. I have noticed that sometimes, once the battery is full and the zappi is then charging with the surplus and then the cloud comes in so that my surplus genetration falls (below the 1.4kws that Zappi needs ) that the zappi keeps charging the car by taking power from the battery . Now this doesnt happen every time but its often enough. Then when the solar starts making loads of power again Zappi takes all that surplus but keeps taking power from the battery too.

If this happens and I then Pause the Givenergy battery in the Givenergy app, the Zappi then only takes the solar surplus again. After a few mins I press the Play button on the battery app. But after doing this pause then play routine Zappi only takes surplus solar.....

Any ideas why this annomaly is happening and how I might correct it so that Zappi never takes power from the battery? Thanks in advance

Hopefully my explaination above is clear?

Because the DC Givenergy battery is just another mix of house load/supply the Zappi has no knowledge of when it is draining the battery. If you had an AC coupled battery you could have another CT on the AC outlet from the AC Battery. This is not possible with the DC battery. What you can do is set a Grid export level on the Zappi so that it will only use spare solar on eco+ when the system is exporting. The following are notes supplied to me by Givenergy when I asked about the same issue.

https://support.myenergi.com/hc/en-gb/articles/6778001879569-Using-a-battery-with-your-myenergi-system?source=search&auth_token=eyJhbGciOiJIUzI1NiJ9.eyJhY2NvdW50X2lkIjoxMDgzOTQ3MywidXNlcl9pZCI6MTQxODc5NDE0NzE4ODksInRpY2tldF9pZCI6MTYwNTY1LCJjaGFubmVsX2lkIjo2MywidHlwZSI6IlNFQVJDSCIsImV4cCI6MTY4MzExMjQzN30.lC6ojAYJeQVS23AJUbGhd16Od8GYgXh2hjE7SfB9KMgv

QPRfan, there are lots of posts on this same subject.

Here is another one that also explains a bit more.
With a hybrid inverter and battery from GE, and a car charger from MyEnergi, you are never going to completely stop the Zappi taking some charge from the battery, just minimise it to an acceptable level by changing the Zappi (or Master device) settings to these or similar, Export Margin = 150 W, Start Delay = 60 seconds, Stop Delay = 120 seconds.

https://community.givenergy.cloud/d/457-solar-panels-charging-electric-car-and-draining-giv-energy-52kw-battery