Selecting the wrong photovoltaic (PV) grid cabinet risks inspection failures, costly downtime, and loss of ROI. Here's what you need to know before you buy. PV grid cabinets are the. Transformers are critical in designing many large solar PV systems, whether stepping up the voltage to connect to a transmission grid or stepping it down for on-site use. However. Solar power is the conversion of energy from sunlight into electricity, either directly using a photovoltaic system, or indirectly superheating water to turn a turbine or take a hot shower. Fibox provides enclosures for solar applications for tracking, collecting, and distributing power.