SUN-12K-SG04LP3-EU bootloop problem

Hello
I have a problem with my inverter SUN-12K-SG04LP3-EU, almost every day around 9-10PM hours (I live in Poland) when the sun more or less sets, it cuts off the current on the AC side. The inverter enters a bootloop and is unable to start by itself, only a manual reset helps, have you had this happen? I do not yet have energy storage, there is, of course, a power supply from the power company at all times

Buy a compatible battery. It will solve your issue.
The 3-phase models should not be run without batteries.
It even states so in the manual...