Inverter-string mismatch: Between the total string voltage and the inverter's MPPT range. PV modules degrade at different rates, leading to different output voltages. Normally, L1 and L2 track within 0. When the inverter detaches from the grid, the spread between L1 and L2 abruptly widens out to 3v, but the total still seems to be around 240v (L1 could be 119. This way, it ensures on the one hand that the PV modules always operate. Both the maximum voltage value and operating voltage range of an inverter are two main parameters that should be taken into account when stringing the inverter and PV array. It occurs when the operating voltages of PV modules, strings, or arrays do not align correctly. A solar inverter or photovoltaic (PV) inverter is a type of power inverter which converts the variable direct current (DC) output of a photovoltaic solar panel into a utility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-grid electrical. Voltage mismatch refers to the condition where individual solar modules or strings within a PV array operate at different voltages, causing the overall system to perform below its maximum power potential.