Other optional components include renewable energy credit revenue-grade meter, maximum power point tracker (MPPT), GPS solar tracker, Energy management software, solar concentrators, solar irradiance sensors, anemometer, or task-specific accessories designed to meet specialized requirements for a system owner.
A similar term to balance of system is “balance of plant (BOP)” which is generally used in the context of power engineering and applies to all the supporting components and systems of the power plant which are needed to produce the energy.
The solar cell technology is still evolving and improving, and costs are being reduced fast.
The balance of systems consists mostly of items which are not specific to solar technology.
As an example, the mounting structures are quite usual and the technology may already be mature, benefitting little from further innovation and research.