Can I connect other third party inverter with X1-Hybrid-LV？

Yes，also two meters are needed to be connected in the system, the communication cables of the meters should be connected in parallel. For example, the 485A of one meter should be connected with the 485A of the other meter, and the 485B of one meter should be connected with the 485B of the other meter. About how to wiring, please refer to the user manual for more details.