My similar setup was installed by an electrician so I'm not sure about any settings needed, but this info might help..
My Acrel meter, with the CT installed on the incoming supply from the grid (on the live conductor only). The Run light flashes green and the Com light flashes red. It agrees with what my smart meter displays.
This is monitored by the Solis inverter and is displayed under the 'Meter Info' heading...
The minus sign means that power is being imported, I think.
There is another parameter, Grid Power - does anyone know what this is? It isn't the figure from the Acrel meter, anyway.
Do you have the Solis 'Quick Installation Guide' for the RAI-3K-48ES-5G? This shows the wiring connections for the Acrel meter. If necessary I can scan it and post it here. I suggest you check that yours has been wired correctly, including checking the data cable to the inverter. This should have RJ45 plugs crimped onto each end. If these were fitted by the installer (rather than using a ready made cable) they may not be making proper contact - try unplugging both ends of the data cable (with everything switched off) and checking continuity through each core.
The SolisCloud app: This gets its info on the PV, battery and grid connection power flows from the inverter, and I think it must calculate what the house load is, from the other three. So it won't work right if the inverter isn't getting data from the Acrel meter. (The inverter won't work right either). Also of course the CT on the feed from the PV inverter has to be working correctly too. (This is shown in the inverter menus as PV-CT power). The app only updates every 10 minutes.
In my case, although the inverter is picking up the data from the CTs, Soliscloud is still not displaying it correctly, and Solis Support are looking into the problem.
To use Solis Techview you have to hold your smartphone close to the data logger stick on the inverter and connect to its wifi signal (wifi password solis100). The installer password is solis123 and the advanced user password is solis123456
However the app is something of a disappointment - it shows lots of parameters which seem to be different from those visible via the inverter front panel screen, with no explanation of what they mean. There is no option to e.g set what time to charge the battery from the grid.