On the 5KVA Mecer inverter with 145v solar. You chould have a series of 3 panels not more. Your Panels range between 30 - 40 v per panel (estimate) 3 panels should give you around 105 - 120v. If 4 conencted in series your inverter will go into fault mode as you exceeding max Charge V on your Mppt. 2x panels could work but your will be switching your mttp on and off from pushing out low voltage.