Optimizer losses

When defined, Power Optimizers can improve overall system efficiency. However, they also have their own internal efficiency and physical limits, which result in additional losses.

In PVsyst, optimizers impact is computed after the array losses, before the DC wiring resistance. As for now, any wiring losses between the modules and the optimizer cannot be explicitly specified.

During normal operation, when the optimizer input is within its nominal limits, the only loss is from optimizer efficiency. This is typically defined as a function of the optimizer duty cycle (or output-to-input voltage ratio) and input voltage.

If input power, voltage, or current exceeds the optimizer limit, additional clipping voltage is applied. When a limit is reached, a new operating point is found on the module I-V curve. The difference between the MPP and the new operating point is stored in one of the optimizer clipping variables.