DC voltage pinned at minimum

In SCADA data the inverter DC voltage stays at or near its minimum operating threshold while output is lower than the irradiance would support. The inverter stays online and looks available, but it cannot track the array's true maximum power point, so power is left on the DC side. This pattern points to inverter voltage floor losses: array Vmp has dropped below the inverter's minimum DC input voltage because of high temperature, degraded modules, a tight string design margin or reactive power operation. It shows up most during hot periods, because module voltage falls as cell temperature rises. It can look like clipping or general underperformance, so first rule out outages, curtailment, clipping, soiling and sensor faults. To confirm it, compare the operating voltage with an independent Vmp estimate from in-situ or string IV sweeps or a temperature-corrected module model. The case is supported when the operating voltage stays above Vmp and the power stays below Pmp. Fixes include checking inverter settings, coordinating tap or voltage setpoint changes, reviewing reactive power requirements, and retesting MPPT recovery in hot weather.