Optimizer losses

When defined, Power Optimizers can improve the overall system efficiency. But they also have their own internal efficiency and physical limits, leading to 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.

In normal operating, when the optimizer input is within its nominal limits, the only loss comes from the optimizer efficiency. It is usually defined as a function of the optimizer duty cycle (or Output / Input voltage ratio ratio) and the input voltage.

If the input power, voltage or current is higher than the optimizer limit, additional clipping voltage may be applied. When one limit is reached, a new input operating point will be searched on the module IV curve. The difference between the MPP and the new operating point will be stored in one of the optimizer clipping variables.