LHLX-PV24/Z/D Photovoltaic DC Bus Box

LHLX-PV24/Z/D Photovoltaic DC Bus Box

The LHLX-PV24/Z/D is a photovoltaic DC combiner-box product family for bringing PV string circuits together before the inverter or downstream DC equipment. The offered assembly must be matched to the project one-line diagram, module and inverter data, installation environment, and applicable electrical rules. Monitoring and protective-device arrangements should be confirmed for the exact ordered configuration.

Rating notice: Earlier versions of this listing showed different maximum DC voltages in the overview, component descriptions, and parameter table. Those figures cannot be treated as a verified rating for the complete assembled box. Ask for the current signed datasheet and approved drawing before specifying a system voltage or ordering.

What to Specify for a PV DC Combiner Box

Project input	What the supplier should confirm
PV array and inverter	Module Voc and Isc, temperature coefficients, modules per string, inverter MPPT voltage and current limits, and the approved one-line diagram.
String circuits	Input and output circuit count, grouping by MPPT, conductor sizes, cable entry and terminal arrangement.
DC ratings	Maximum system DC voltage and current of the complete assembly, plus ratings of each fuse and holder, disconnect, surge protector, busbar and terminal.
Protection and monitoring	Required string overcurrent protection, DC isolation, surge protection, monitoring channels, power supply and communications.
Installation	Enclosure material and environmental rating, ambient temperature, corrosion exposure, mounting, access and any site-specific test requirements.

Configuration and Verification

The final fuse or breaker arrangement depends on the module maximum series fuse rating, possible reverse current, calculated circuit current and fault duty. A surge protector and a disconnect perform different functions; neither substitutes for the other. An AC-only protective device must not be assumed suitable for a PV DC circuit. Confirm that all selected components and the assembled enclosure have ratings appropriate to the same proposed system.

For a monitoring version, request a point list describing which string currents, bus conditions, protective-device states and temperatures are measured, together with the communications protocol, auxiliary-power requirements and alarm behavior. Do not infer a complete-box rating from a surge protector or monitoring power module rating.

Documents to Request with a Quotation

• Current signed datasheet for the offered LHLX-PV24/Z/D configuration, including complete-assembly DC voltage and current ratings.
• Approved electrical schematic, component schedule and enclosure drawing.
• Applicable test and certification evidence for the offered assembly and its critical DC components.
• Installation, operation and maintenance instructions, including terminal torque and environmental limits.
• Lead time, warranty scope and any project-specific customization details.

Send the array one-line diagram, module datasheet, inverter datasheet and site conditions with your inquiry. For a step-by-step selection discussion, see our solar panel combiner box guide. Final electrical design and installation should be reviewed by qualified personnel under the applicable local requirements.