Solar
What Is a Solar AC Combiner Box?
A solar AC combiner box collects AC outputs from multiple inverters into a protected outgoing feeder or bus arrangement.
How it operates
Individual inverter outputs connect through their assigned protective and isolation devices. The common bus and outgoing feeder carry the designed simultaneous output, with ratings based on the inverter system and installation conditions.
Components and protection
Assemblies can include AC breakers, busbars, metering, surge protection, neutral and protective-earth terminals. Coordinate feeder protection with the upstream board and verify prospective fault current.
Selection inputs
Provide inverter count, output voltage and current, phase arrangement, cable sizes, connection diagram and environmental conditions. Consider voltage rise, phase balance and utility interconnection requirements.
Frequently asked questions
Is an AC combiner the same as a DC string combiner?
No. An AC combiner collects inverter AC outputs. A DC string combiner collects PV string circuits before the inverter; their switching and protection ratings differ.
Are the examples a GEESYS product specification?
No. Worked examples explain selection principles. Use the selected product datasheet and approved project design for actual ratings and installation requirements.
Related GEESYS products
Discuss your project with GEESYS
Share your load details, site conditions and single-line diagram for a project-specific recommendation.
Explore related products | Contact GEESYSFurther reading: SMA string-combiner documentation. Use the documentation for the equipment installed on your project.
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