PancakeMan

Here is another snapshot. Running SBU from 10:26 with much greater loads(upto 8kW), hotter ambient temperatures and PV power close to 5kW, and the inverter didn't move once over 60C. It just seems like the SUB mode is flawed.  I will run a test tonight in SUB more and see if there is still the same issue without solar production. 

Thanks @Steve87 and  @WannabeSolarSparky . Please find the pic of the setup attached. 
Awesome thanks @WannabeSolarSparky good to know. Any reason why we don't see the same temperatures when it is running in SBU. Is the AC-AC with solar DC-AC really that inefficient. It seems like the DC-AC only is a lot more efficient. 
Could the losses have something to do with synchronizing with the grid?  

Hi Power forum,
First time poster here. Recently installed an RCT AXPERT MAX 8KVA/8KW with 3x pylontech US300C batteries and 18x395w Jinko panes (2 strings 10/8). Everything is running well, except for some strange issues with regard to "Blended" power from Solar/Grid Mode. I am seeing inverter temperatures above 70C. The inverter is located undercover with ample air at cool winter temperatures <20C. 
Has anyone else seen issues like this with their inverters? 
Iv added a picture of todays test although this happens every time the inverter goes into Solar/Grid Mode. As soon as I manually change it to Solar/Battery mode temps get much better. 
Any insights would be great. The inverter is ~1 month old.