
Development: Design considerations of photovoltaic systems 139
adopted by the industry. The CEC efficiency is a weighted efficiency that is calculated
using data measured at various power inputs. Typical CEC rated inverter efficien-
cies for large capacity inverters are around 97.5 percent. The efficiency curves of the
inverters as a function of the DC power input and DC voltage input are not typically
provided in the data sheet and have to be requested from the manufacturer.
The core of the inverter operations and control functions reside in the electronic
controller of the unit. This electronic controller is a microprocessor-based, special ...