BOS
Acronym for: Balance of System
All non-module components of a solar system: inverters, wiring, mounting, combiner boxes, etc.
Detailed Explanation
BOS (Balance of System) covers all parts of a solar system other than the modules themselves: inverters, DC/AC wiring, mounting structures, combiner boxes, monitoring systems, transformers, and grid interconnection equipment. For utility-scale projects, BOS represents ~40-50% of total project cost. Reducing BOS cost is a major industry focus. Common BOS optimization: using higher-wattage modules (fewer wires, smaller BOS), single-axis trackers, 1500V or higher system voltage, central inverters.
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Related Terms
Device converting DC electricity from solar panels into AC for grid/home use.
System of batteries (typically LFP or NMC) storing solar electricity for use when the sun isn't shining.
Mounting system that rotates panels to follow the sun, increasing yield 15-25% over fixed-tilt.