Product overview
What to Know About Solar Combiner Box (4-string)
A combiner box is where multiple parallel strings of panels meet before heading to your charge controller or inverter, and it typically houses fuses or breakers to protect each string individually. This listing covers a 4-string configuration, suited to arrays split across four separate wiring runs, commonly due to roof layout or shading considerations.
Since the exact manufacturer and model aren't specified, confirm the maximum system voltage it's rated for, the string fuse or breaker ratings included, and whether it comes with a surge protection device built in, since some combiner boxes include SPD protection and others require it added separately.
Technical checklist
Key Specifications & Compatibility
Configuration: 4-string PV combiner box
Exact manufacturer/model: not identified
Check before buying: maximum DC system voltage and rated string/input current
Check before buying: number and rating of string fuses/breakers
Check before buying: whether a DC surge protection device is included and its rating
Check before buying: enclosure/IP rating and outdoor installation suitability
Best-fit guidance
Who This May Suit
Arrays with panels split across multiple strings that need to be combined before the inverter.
Good to Know Before Buying
Confirm maximum system voltage, fuse ratings, and whether SPD protection is included before purchase.
Buyer checklist
Questions to Ask Before Buying
- What's the maximum DC system voltage this combiner box is rated for?
- What fuse or breaker rating comes with each string input?
- Does this include a built-in surge protection device, or do I need one separately?