{"id":7470,"date":"2026-01-29T15:07:13","date_gmt":"2026-01-29T14:07:13","guid":{"rendered":"https:\/\/q3-energie.de\/pv-connection-technology-products-firefighter-switches-generator-junction-boxes-ac-dc-boxes\/pv-generator-connection-box-gak-custom-built-up-to-1500-v-dc-q3\/"},"modified":"2026-05-27T17:57:47","modified_gmt":"2026-05-27T15:57:47","slug":"custom-dc-combiner-boxes","status":"publish","type":"page","link":"https:\/\/q3-energie.de\/en\/products\/custom-dc-combiner-boxes\/","title":{"rendered":"PV Combiner Box (GCB) | Custom up to 1,500 V DC | Q3"},"content":{"rendered":"\n
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Custom DC Combiner Boxes for PV Systems<\/h1>\n\n\n\n
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Project-specific custom DC combiner for commercial and utility-scale photovoltaic systems up to 1,500 V DC.<\/strong><\/h2>\n\n\n\n
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Individually configured custom DC combiner \u2192<\/a><\/div>\n\n\n\n
Protection and Safety Concept \u2192<\/a><\/div>\n\n\n\n
Monitoring Options \u2192<\/a><\/div>\n\n\n\n
Which DC Combiner Solution is Right? \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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\"Custom\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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Typical Applications of Q3 PV Generator Junction Boxes<\/h2>\n\n\n\n

No off-the-shelf products: custom-engineered DC combiner boxes and PV string combiner solutions for commercial, industrial and utility-scale photovoltaic systems.<\/h3>\n\n\n\n

Protection concept, connection technology, enclosure design and monitoring functions are individually configured for each project \u2013 including standards-compliant design and documented testing.
Custom DC combiner boxes are particularly suitable for PV systems with complex layouts, high string counts or project-specific protection requirements.<\/p>\n\n\n\n

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Commercial and industrial PV systems with high string density<\/strong><\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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PV systems with complex roof layouts or multiple generator fields<\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Expandable PV projects for phased construction or utility-scale applications<\/strong><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Custom-Engineered DC Combiner Boxes for PV Systems<\/h2>\n\n\n\n
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A DC combiner box \u2013 also referred to internationally as a PV string combiner box \u2013 bundles multiple PV strings per MPPT and integrates project-specific protection, disconnect and monitoring functions.<\/em><\/p>\n\n\n\n

Unlike standard off-the-shelf string combiner boxes, every Q3 DC combiner box is individually engineered and precisely matched to the specific PV system design.<\/strong><\/strong><\/h3>\n\n\n\n
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String count per MPPT and module type<\/strong><\/strong><\/p><\/div>\n\n\n\n

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System voltages up to 1,500 V DC<\/strong><\/strong><\/p><\/div>\n\n\n\n

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Short-circuit current (Isc) and reverse current requirements<\/strong><\/strong><\/p><\/div>\n\n\n\n

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Selection of PV string fuses or blocking diodes<\/strong><\/strong><\/p><\/div>\n\n\n\n

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Protection and monitoring requirements<\/strong><\/strong><\/strong><\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Q3 is not a catalogue supplier \u2013 but an engineering partner for DC connection technology.<\/strong><\/h3>\n\n\n\n
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Q3 DC combiner boxes are designed project-by-project and configured according to string count, system voltage, protection concept and monitoring requirements.<\/p>\n\n\n\n

Whether standard PV string combiner boxes or complex DC combiner solutions with integrated protection and disconnect functions \u2013 every system is individually engineered, manufactured and electrically tested.<\/p>\n\n\n\n

The focus is on straightforward integration, clearly defined configurations and cost-efficient implementation while maintaining standards-compliant system design.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Project-Specific Design of DC Combiner Box Solutions<\/h2>\n\n\n\n
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Our custom-engineered DC combiner boxes are individually designed according to the specific PV system layout \u2013 from commercial rooftop systems to utility-scale solar plants.

During system design, parameters such as string count, system voltage (up to 1,500 V DC), short-circuit currents (Isc), reverse current conditions, as well as the required protection and monitoring concept are taken into account.
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Typical Design Parameters:<\/p>\n\n\n\n

\u25a0 High string density per inverter

\u25a0 Parallel connection of multiple generator fields

\u25a0 Segmented roof and system structures

\u25a0 Integration into monitoring and control systems

\u25a0 Consideration of short-circuit and reverse currents<\/h3>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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Protection and Safety Concepts for GAK and DC Combiner Solutions<\/h2>\n\n\n\n
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A generator junction box or DC combiner is far more than just a simple string collection box.<\/p>\n\n\n\n

It performs central protection, isolation, and monitoring functions within the PV generator side \u2013 tailored to the number of strings, system voltage, and reverse current conditions.<\/strong><\/p>\n\n\n\n

Typical protection and safety functions:<\/em><\/em><\/p>\n\n\n\n

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String Fuses or Blocking Diodes<\/strong>
<\/strong>Protection of individual PV strings in parallel string configurations. Designed according to module technology and permissible reverse current.
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Reverse Current Protection for Parallel Strings<\/strong><\/strong>
<\/strong>Prevention of impermissible equalization and fault currents between generator fields.
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DC Surge Protection Type 1+2<\/strong>
<\/strong>DC Surge Protection Type 1+2<\/p><\/div>\n\n\n\n

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Potential-Free Remote Signaling Contact<\/strong><\/strong>
Status indication of fuses or SPD modules to monitoring or control systems.
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DC Isolator Switch according to IEC 60947-3<\/strong>
Standards-compliant all-pole isolation for maintenance and service work.<\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Monitoring options for PV string boxes and DC combiners<\/h2>\n\n\n\n
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Depending on the project requirements, the following functions can be integrated:<\/p>\n\n\n\n

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Individual string current monitoring<\/strong><\/p><\/div>\n\n\n\n

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Status monitoring of SPD modules<\/strong><\/p><\/div>\n\n\n\n

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Centralised status and fault signals<\/strong><\/p><\/div>\n\n\n\n

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Interfaces for SCADA systems or plant controllers<\/strong><\/p><\/div>\n<\/div>\n\n\n\n

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\"Super\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n\n\n
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View intelligent monitoring \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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The monitoring functions described here are intended for status and current monitoring on string or component level.

For applications requiring active fault discrimination, automatic string shutdown or advanced analysis functions (e.g. identification of faulty strings during operation), we recommend the DC Combiner Super Multi Box with integrated PV string fault discriminator.<\/strong>

This means the custom-built DC combiner box remains the flexible solution for conventional monitoring and protection requirements, while the Super Multi Box has been specifically developed for intelligent fault detection and operational optimisation in utility-scale PV systems.<\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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Which PV Systems Are Custom DC Combiner Boxes Suitable For?<\/h2>\n\n\n\n
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Commercial and logistics rooftop PV systems<\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Industrial PV systems with complex roof structures<\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Ground-mounted PV systems | Agri-PV<\/strong><\/strong><\/h3>\n<\/div>\n<\/div>\n\n\n\n
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Utility-scale solar power plants<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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High string densities per MPPT tracker<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n\n\n\n
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Projects with customised protection or grounding concepts<\/strong><\/strong><\/strong><\/h3>\n<\/div>\n<\/div>\n\n\n\n
\"Technische<\/span>
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Custom-engineered DC combiner boxes \u2013 internationally often referred to as DC combiner boxes or PV string combiner boxes \u2013 bundle multiple PV strings per MPPT tracker in a standards-compliant way and integrate project-specific protection, isolation and monitoring functions.<\/strong><\/p>\n\n\n\n


Whether commercial rooftop PV systems, industrial installations or utility-scale solar plants:
Q3 DC combiner solutions are precisely designed according to string count, system voltage up to 1,500 V DC, short-circuit currents (Isc) and reverse current conditions. Compared to standardised solutions, this results in a DC connection box that:<\/p>\n\n\n\n

\u25a0 is technically dimensioned with precision

\u25a0 avoids unnecessary oversizing

\u25a0 can be integrated in a standards-compliant manner

\u25a0 is designed for long-term operational reliability and serviceability<\/h3>\n<\/div>\n\n\n\n
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\"Technical\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n

This makes the custom-engineered DC combiner box the ideal solution for demanding PV systems with high string density, special grounding or protection concepts, and complex generator structures.<\/strong><\/h3>\n<\/div><\/div>\n\n\n\n
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\"DC-Anschlusstechnik<\/span>
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Which DC Combiner Solution Fits My Project?<\/h2>\n\n\n\n
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Custom DC Combiner Box
Project-Specific Solution<\/h3>\n\n\n\n
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Custom-engineered DC combiner box for PV systems up to 1,500 V DC \u2013 ideal for demanding commercial, industrial and utility-scale solar projects.<\/p>\n\n\n

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\"Custom-engineered<\/figure>\n<\/div>\n\n\n
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Freely configurable<\/strong><\/p><\/div>\n\n\n\n

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Project-specific protection concepts<\/strong><\/p><\/div>\n\n\n\n

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Custom string count configuration<\/strong><\/p><\/div>\n\n\n\n

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Integration of monitoring functions possible<\/strong><\/p><\/div>\n\n\n\n

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From single projects to series production<\/strong><\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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LITE DC Combiner
Standard Solution<\/h3>\n\n\n\n
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Standardised PV string combiner box for 1 | 2 | 3 MPPT systems with integrated surge protection \u2013 designed for projects with clearly defined standard requirements.<\/em><\/p>\n\n\n

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\"Standardised<\/figure>\n<\/div>\n\n\n
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Pre-configured DC combiner boxes<\/strong><\/p><\/div>\n\n\n\n

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Cost-efficient standard solution<\/strong><\/p><\/div>\n\n\n\n

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Clearly defined standard configurations<\/strong><\/p><\/div>\n\n\n\n

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Fast availability<\/strong><\/p><\/div>\n\n\n\n

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Ideal for recurring PV system designs<\/strong><\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Super Multi Box
Intelligente DC-Combiner<\/h3>\n\n\n\n
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Smart DC combiner with active fault detection \u2013 developed for utility-scale PV systems with advanced monitoring and performance optimisation requirements.<\/p>\n\n\n

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\"Smart<\/figure>\n<\/div>\n\n\n
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Intelligent DC Combiner<\/strong><\/p><\/div>\n\n\n\n

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Patented PV string fault discrimination<\/strong><\/p><\/div>\n\n\n\n

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Patented PV string fault discrimination<\/strong><\/p><\/div>\n\n\n\n

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Integrated individual string monitoring<\/strong><\/p><\/div>\n\n\n\n

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Communication interfaces (e.g. Modbus, Ethernet)<\/p><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Custom DC Combiner \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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LITE DC Combiner \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Super Multi Box \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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\"Technischer<\/span>
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Engineering, Manufacturing and Testing in Germany<\/h2>\n\n\n\n
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Every Q3 custom DC combiner box is individually engineered, manufactured and electrically tested \u2013 entirely at our production site in Germany.<\/p>\n\n\n\n

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Individually designed for each electrical application<\/strong><\/p><\/div>\n\n\n\n

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Standards-compliant design up to 1,500 V DC<\/strong><\/p><\/div>\n\n\n\n

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Fully electrically tested<\/strong><\/p><\/div>\n\n\n\n

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Fully documented and traceable<\/strong><\/p><\/div>\n\n\n\n

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Tested with documented test protocol<\/strong>
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Download DC Combiner Technical Documentation \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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\"Engineering,<\/figure>\n\n\n\n
\"Every<\/figure>\n\n\n\n
\"Q3<\/figure>\n\n\n\n
\"Q3<\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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\"Technische<\/span>
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Project Inquiry \u2013 DC Connection Technology | Custom DC Combiner Boxes<\/h2>\n\n\n\n
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Would you like to configure a DC combiner box for your PV project, review technical details or define the optimal string and protection concept for your PV system?<\/strong>

Using the following inquiry form, we collect all relevant project data in a structured and traceable way \u2013 from string count through to the required monitoring integration.<\/p>\n<\/div>\n\n\n\n

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You are welcome to upload data sheets, single-line diagrams, string layouts, Isc values, grounding concepts or protection concepts directly with your inquiry.
Based on this information, you will receive a project-specific DC combiner solution or an individually configured DC combiner box. If clarification is required, we will coordinate the details directly with you.<\/em><\/p>\n\n\n\n

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Start Project Inquiry \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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\"Anfrage\"<\/span>
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Project Inquiry \u2013 Custom DC Combiner Boxes<\/h2>\n\n\n
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\"Anfrage\"<\/figure>\n<\/div>\n\n\n

Inquiry form for the project-specific configuration of your custom DC combiner box including a tailored quotation.<\/p>\n\n\n\n

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Projektanfrage Generatoranschlusskasten PV starten \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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\"PDF\"<\/span>
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Technical Documentation \u2013 DC Connection Technology<\/h2>\n\n\n
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Data sheets, certificates and technical documentation for our complete DC connection technology portfolio including LITE DC Combiner and Super Multi Box.<\/p>\n\n\n\n

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Technische Unterlagen DC-Anschlusstechnik \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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\"Super<\/span>
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DC Combiner Super Multi Box<\/h2>\n\n\n
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\"Super<\/figure>\n<\/div>\n\n\n

Intelligent DC combiner with active PV string fault discrimination, automatic shutdown of faulty strings and integrated individual string monitoring.<\/p>\n\n\n\n

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Funktionsweise + Technik Super Multi Box \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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\"GAK<\/span>
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LITE DC Combiner Standard Solution<\/h2>\n\n\n
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Pre-configured DC combiner boxes for recurring PV system concepts \u2013 cost-efficient standard solutions with integrated surge protection concepts.<\/p>\n\n\n\n

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Funktionsweise + Technik GAK LITE \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Typical Applications of Q3 PV Generator Junction Boxes No off-the-shelf products: custom-engineered DC combiner boxes and PV string combiner solutions for commercial, industrial and utility-scale photovoltaic systems. Protection concept, connection technology, enclosure design and monitoring functions are individually configured for each project \u2013 including standards-compliant design and documented testing.Custom DC combiner boxes are particularly suitable… <\/p>\n","protected":false},"author":1,"featured_media":7369,"parent":7284,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"class_list":["post-7470","page","type-page","status-publish","has-post-thumbnail","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7470","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/comments?post=7470"}],"version-history":[{"count":0,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7470\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7284"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/media\/7369"}],"wp:attachment":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/media?parent=7470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}