This comment probably has nothing to do with you guys' problem with the 12K Growatts controller/inverter. I'm looking into getting one as my MPPT LV2424 just can't handle any load over 2k watts. But at times it would shutoff for about 45 seconds then restart. After a few weeks of hourly monitoring, I finally found three issues that was killing my lv 2424.
First my 2424 cannot handle more that 2kw although it supposed to be able to handle at least 3kw. To solve this program, I had to re-arrange my electric sub-panel which is connected to my 2424 to only have max loads less than 2k. I had to move all appliance to their own side of the sub panel that is only Utility power and isolated from the controller side of the panel.
Second, it would shut off every time when that battery current reached 22 amps in the evening. - I solved that problem by increasing the option at what battery voltage will discharge to before switching the Utility power. It was set at 24.0 volt and when doing the math respect to the house average load, the current was over 25 amps. But changing this option to 24.5 volts, the current now never gets over 18 amps.
The third problem with the controller shutting off was to overheat. It turns out that my controller does not like being hotter that 104 degrees F. I life in California, and during the summer months, we see lots of days with those temps and never under 98 degrees. Note that my controller is outside but covered from the rain. To solve the heating problem, I have to have a large fan blowing on it which does keep the controller just under 100 degrees.
Anyway, I have to rip my solar system down due to an inspection and of course I have to permits to instill one and how I wired the sub-panel is not legal or to code. So, when I do re-install solar, I want to use a hire capacity controller that can handle all my loads including the outside Air conditioner. And not have to miss with the house electrical sub-panel.