Hello I bought Must pv1800 pro 5kw inverter. In manual there are write , that this inverter can work without battery. But in settings there are no how set up work without battery. Any one can help me? This inverter I bought from resale, so he can not help me. Sad. Maybe someone can help me? I tested program to join inverter and laptop wit USB cable. It works fine , but no settings on laptop. Only monitoring.