Large Increase in Energy Use Since Installation

[spiral]

Hi, I recently had installed a system of
18x Aiko Neostar 475 W solar panels.
Fox ESS KH 7KW Inverter
Fox ESS EP6 Plus 5.76KW battery.

Pre installation I used 7.77KW per day averaged over 99 days between Jan and May when home all day based on energy paid for through my utility provider.
Post installation my usage has averaged 11.82KW per day over 46 days between May and July as noted through the app.
My installer has spoken to Fox who have monitored my account and said they can see nothing wrong. They have also advised that the system energy does not appear as "usage" within the app as all the figures displayed are post operational use so somewhere since the installation, my property is draining and extra 4.12 KW on average or more than 50% extra per day.
Has anyone else seen this or can someone point me to what the issue is/might be.
Thanks

[Will]

The K series is a large, high-performance inverter with fairly high operational cost in terms of self powering.
200 watt-hours ish to operate would give you what you're seeing daily totals-wise.
Ultimately, you should be better off as the panels will cover the operating overhead and then hopefully generate some nice surplus.