{"id":8482,"date":"2026-07-01T13:34:58","date_gmt":"2026-07-01T11:34:58","guid":{"rendered":"https:\/\/q3-energie.de\/products\/smart-dc-combiner\/string-monitoring-dc-combiner-super-multi-box\/"},"modified":"2026-07-01T18:28:24","modified_gmt":"2026-07-01T16:28:24","slug":"pv-string-monitoring","status":"publish","type":"page","link":"https:\/\/q3-energie.de\/en\/products\/smart-dc-combiner\/pv-string-monitoring\/","title":{"rendered":"String Monitoring DC Combiner Super Multi Box"},"content":{"rendered":"\n
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PV String Monitoring with the Q3 Super Multi Box – String Monitoring for Large-Scale PV Systems<\/h1>\n\n\n\n
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Keep every PV string in view \u2013 for maximum system availability. The Q3 Super Multi Box monitors up to 24 strings, detects irregularities at an early stage and enables fast analysis directly via the PV string monitoring web interface.<\/h2>\n\n\n\n
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Open Demo Dashboard \u2192<\/a><\/div>\n\n\n\n
What is PV String Monitoring? \u2192<\/a><\/div>\n\n\n\n
Which data is monitored? \u2192<\/a><\/div>\n\n\n\n
Central inverter applications \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Q3 Super Multi Box Demo Dashboard | PV String Monitoring for DC-Combiner<\/h2>\n\n\n\n

Live demo of the web interface<\/strong><\/p>\n\n\n\n

The demo dashboard gives you a first impression of the PV String Monitoring functions of the Q3 Super Multi Box. The demo is based on a real test system and shows how individual PV strings, operating data and status messages are displayed in the web interface.<\/p>\n\n\n\n

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Access data for the PV String Monitoring Demo Dashboard<\/h3>\n\n\n\n

Username<\/strong>: Q3-Test
Password:<\/strong> Pi!oT#
The character after the \u201cP\u201d is an exclamation mark \u201c!\u201d, not a lowercase L.<\/em><\/p>\n\n\n\n

Nach dem Login geben Sie rechts oben die Seriennummer ein:<\/p>\n\n\n\n

ENDQ32025<\/strong><\/p>\n\n\n\n

Then click \u201cConnect.\u201d

After logging in, enter the serial number in the top right corner:
ENDQ32025<\/strong>
Then click \u201cConnect\u201d. <\/p>\n<\/div>\n\n\n\n

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Note on the demo system<\/strong><\/p>\n\n\n\n

The demo dashboard is intended exclusively to demonstrate the user interface and operating logic. Switching functions may be displayed or simulated in the demo system, but no real switching operation is carried out. <\/p>\n\n\n\n

The data is updated regularly. The historical data continues to grow as the demo system remains in operation. <\/p>\n\n\n\n

The dashboard is based on a real test system and is used exclusively to demonstrate the web interface.<\/strong><\/p>\n\n\n\n

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Open Demo Dashboard PV String Monitoring \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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Explanation of the Demo Dashboard PV String Monitoring<\/h3>\n\n\n\n
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1<\/p>\n<\/div>\n\n\n\n

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Enter serial number<\/strong>
Enter the serial number of the desired Super Multi Box in the top right corner. For our live demo, the serial number is:
ENDQ32025<\/strong> <\/p>\n<\/div>\n\n\n\n

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2<\/p>\n<\/div>\n\n\n\n

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Connect<\/strong>
Click Connect. The dashboard then loads the data assigned to the entered serial number. <\/p>\n<\/div>\n<\/div>\n\n\n\n

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3<\/p>\n<\/div>\n\n\n\n

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Select DC combiner<\/strong>
This section shows the DC combiners or generator connection boxes installed in the system. In the demo system, two GAKs are available and can be selected individually. <\/p>\n<\/div>\n\n\n\n

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Online\/offline status<\/strong>
This display shows whether the selected DC combiner is currently online. It also shows the time of the last data update.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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5<\/p>\n<\/div>\n\n\n\n

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Set current tolerance<\/strong>
The current tolerance defines the deviation from which a string is marked as irregular. This makes it easier to detect uneven string currents at an early stage. <\/p>\n<\/div>\n\n\n\n

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Switch strings on or off<\/strong>
These buttons can be used to switch all strings on or off. In the demo system, the switching process is only simulated and is not physically carried out. <\/p>\n<\/div>\n<\/div>\n\n\n\n

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7<\/p>\n<\/div>\n\n\n\n

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Current operating data<\/strong>
This row displays the current operating values of the box, such as DC voltage, current, power and internal and external temperature values.<\/p>\n<\/div>\n\n\n\n

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8<\/p>\n<\/div>\n\n\n\n

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Individual strings<\/strong>
These fields show the individual PV strings. The current string current, status, history access and switching function are displayed for each string. <\/p>\n<\/div>\n<\/div>\n\n\n\n

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9<\/p>\n<\/div>\n\n\n\n

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Status indicators<\/strong>
The status bar shows the most important operating states of the box: current measurement, box status, SPD status and the internal 5 V and 9 V supply voltages.<\/p>\n<\/div>\n\n\n\n

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Test Demo Dashboard now \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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Please note:<\/strong><\/p>\n\n\n\n

\u25a0 The measured values are updated every 60 seconds.

\u25a0 Switching individual strings can be tested.
In demo mode, however, the switching command is not executed and remains in \u201cPending\u201d status.

\u25a0 At very low currents below 1 A, the current tolerance fault detection may react more sensitively.

\u25a0 In GAK 2, string 1 is switched off on the hardware side.

\u25a0 The history continues to grow and shows real operating data from the demo system.<\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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What is PV String Monitoring?<\/h2>\n\n\n\n
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PV String Monitoring means monitoring individual PV strings within a photovoltaic system. Instead of only evaluating electrical values at inverter or generator connection box level, the values are recorded directly at string level.<\/p>\n\n\n\n

This is particularly important in large-scale PV systems. If a single string fails, delivers too little current or shows unusual behavior, this often remains unnoticed for a long time in the overall system yield. The system continues to operate, but no longer at its optimum. This is exactly where the String Monitoring of the Q3 Super Multi Box comes in. <\/p>\n\n\n\n

The Super Multi Box monitors the individual string currents and makes deviations visible. This allows faults to be narrowed down more quickly, maintenance work to be planned more precisely and unnecessary yield losses to be avoided. <\/p>\n\n\n\n

In short: Instead of only noticing that \u201csomewhere performance is missing\u201d, you can see much more clearly which string is affected.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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What are the advantages of the Q3 Super Multi Box?<\/h2>\n\n\n\n
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The Q3 Super Multi Box is more than a conventional DC combiner. It combines DC connection technology, protection technology, String Monitoring and intelligent fault analysis in one system. <\/strong><\/p>\n\n\n\n

The main advantage is transparency: the individual PV strings are not only combined, but also monitored. This means irregularities can be detected at an early stage before a small fault turns into a major system shutdown. <\/p>\n\n\n\n

This is especially useful in systems with central inverters. Here, many strings are connected to one common DC input. Without String Monitoring, it is often only visible that the total output does not match expectations. With the Super Multi Box, the cause can be narrowed down much faster. <\/p>\n<\/div>\n<\/div>\n\n\n\n

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PV String Monitoring: key benefits<\/h2>\n\n\n\n
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Monitoring of individual PV strings<\/p><\/div>\n\n\n\n

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Display of string currents and deviations<\/p><\/div>\n\n\n\n

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Support for fault analysis during ongoing system operation<\/p><\/div>\n\n\n\n

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Better localization of yield losses<\/p><\/div>\n\n\n\n

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More transparency in large DC structures<\/p><\/div>\n\n\n\n

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Suitable for large-scale PV systems with central inverters<\/p><\/div>\n\n\n\n

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Reduction of unnecessary service calls<\/p><\/div>\n\n\n\n

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Higher system availability through faster fault analysis<\/p><\/div>\n<\/div>\n\n\n\n

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The Super Multi Box was developed for operators, EPCs, planners and technical asset managers who do not want to treat the DC side of their PV system as a black box. It shows what is actually happening in the field. <\/strong><\/p>\n<\/div>\n\n\n\n

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Which data is monitored by the PV String Monitoring system?<\/h2>\n\n\n\n

The Q3 Super Multi Box records the relevant operating data of the connected PV strings and displays it clearly via the web interface.<\/p>\n\n\n\n

Depending on the system design and project configuration, the following information can be displayed and evaluated:<\/p>\n\n\n\n

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Current string currents<\/p><\/div>\n\n\n\n

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Status der einzelnen Strings<\/p><\/div>\n\n\n\n

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Operating status of the connected GAK or string areas<\/p><\/div>\n\n\n\n

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Irregularities and deviations in string behavior<\/p><\/div>\n\n\n\n

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Historical values for evaluating current curves<\/p><\/div>\n\n\n\n

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System status messages<\/p><\/div>\n\n\n\n

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Regular updates of measured values during operation<\/p><\/div>\n\n\n\n

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Access to live data via the dashboard<\/p><\/div>\n<\/div>\n\n\n\n

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The measured values help to detect weak strings, switched-off strings, wiring faults, fuse problems or other irregularities more quickly. Especially at low currents or under changing irradiation conditions, a proper technical assessment is important. The data does not replace professional on-site inspection, but it provides a much better basis for fault analysis. <\/strong><\/p>\n\n\n\n

The system status can be viewed directly via the web interface. This makes the system suitable for commissioning, ongoing operation and technical asset management. <\/strong><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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Why is PV String Monitoring important for central inverters?<\/h2>\n\n\n\n

In PV systems with central inverters, many strings are combined on the DC side. This is technically and economically useful for large systems, but it makes fault analysis more difficult. <\/p>\n\n\n\n

If a single string fails, a fuse trips or one string delivers significantly less current, this is often not clearly visible at the central inverter. The central inverter only receives the combined DC current. The actual cause, however, is somewhere in the field. <\/p>\n\n\n

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Without String Monitoring, this often means:<\/strong><\/p>\n\n\n\n

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Time-consuming fault analysis on site<\/p><\/div>\n\n\n\n

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Longer response times<\/p><\/div>\n\n\n\n

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Unclear yield losses<\/p><\/div>\n\n\n\n

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Irregularities and deviations in string behavior<\/p><\/div>\n\n\n\n

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Unnecessary system downtime<\/p><\/div>\n\n\n\n

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DC faults that are difficult to trace<\/p><\/div>\n\n\n\n

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High effort for service and maintenance<\/p><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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With PV String Monitoring, the DC side becomes much more transparent. The technical asset manager can not only see that a problem exists, but can also narrow down the affected area much more precisely.<\/p>\n\n\n\n

This is particularly relevant for large rooftop systems, ground-mounted PV systems and utility-scale projects where many strings are operated in parallel. The larger the system, the more important a clear structure on the DC side becomes.. <\/strong><\/p>\n\n\n\n

The Q3 Super Multi Box supports exactly this approach: record string currents, make irregularities visible and locate faults more quickly.<\/strong><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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Frequently asked questions about PV String Monitoring with the Q3 Super Multi Box<\/h2>\n\n\n\n
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What is the difference between a standard DC combiner and the Q3 Super Multi Box?<\/div><\/summary>
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A conventional DC combiner combines PV strings and, depending on the design, includes protection and disconnection components. The Q3 Super Multi Box goes one step further: it makes the individual strings measurable and visible. This turns a simple connection box into an intelligent DC combiner with String Monitoring and fault analysis. <\/p>\n<\/div><\/details>\n\n\n\n

Which systems is the Super Multi Box designed for?<\/div><\/summary>
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The Super Multi Box is particularly suitable for large-scale PV systems, large commercial PV systems, ground-mounted PV plants and projects with central inverters. Wherever many strings are combined, monitoring at string level provides a clear advantage for operation, maintenance and troubleshooting. <\/p>\n<\/div><\/details>\n\n\n\n

Why is inverter monitoring alone not always sufficient?<\/div><\/summary>
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In many cases, the inverter only displays aggregated values. In large DC structures, this does not immediately show which individual string is affected. String Monitoring provides additional transparency on the DC side and helps to narrow down faults more precisely. <\/p>\n<\/div><\/details>\n\n\n\n

Can individual string faults be detected faster?<\/div><\/summary>
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Yes. If a string deviates significantly, fails completely or does not provide plausible values, this becomes visible through the String Monitoring system. This allows technical service teams to check the affected area more specifically instead of having to inspect large sections of the system manually. <\/p>\n<\/div><\/details>\n\n\n\n

Which values are displayed in the dashboard?<\/div><\/summary>
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Depending on the system design, the dashboard displays current string currents, status information and historical measured values, among other data. The visualization supports both ongoing monitoring and analysis during service and maintenance work. <\/p>\n<\/div><\/details>\n\n\n\n

Is the dashboard suitable for remote maintenance?<\/div><\/summary>
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Yes. The web interface is designed to help assess system conditions remotely. Technical asset managers, EPCs or service partners can gain an initial overview before planning an on-site service visit. <\/p>\n<\/div><\/details>\n\n\n\n

Can real switching operations be triggered via the demo dashboard?<\/div><\/summary>
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No. In the demo system, certain operating functions can be displayed or simulated, but no real switching operations are carried out. The demo dashboard is intended to show the structure, operating logic and monitoring functions of the system. <\/p>\n<\/div><\/details>\n\n\n\n

How often are the values updated?<\/div><\/summary>
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In the demo system, the data is updated every 60 seconds. The actual update interval in a project may vary depending on the system design, communication setup and integration. <\/p>\n<\/div><\/details>\n\n\n\n

Which interfaces are possible?<\/div><\/summary>
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Depending on the project, the Q3 Super Multi Box can be integrated into higher-level monitoring or control systems. The specific interface and communication method are defined during project planning. <\/p>\n<\/div><\/details>\n\n\n\n

Is the Super Multi Box standardized or project-specific?<\/div><\/summary>
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The Super Multi Box is planned project-specifically and adapted to the individual PV system. Key factors include the number of strings, system voltage, current rating, protection concept, monitoring requirements and integration into the existing system communication. <\/p>\n<\/div><\/details>\n<\/div>\n<\/div><\/div>\n\n\n\n

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Q3 DC Connection Technology
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From classic generator connection boxes to customized DC combiner solutions: we design and manufacture DC connection technology tailored to string count, inverter concept, protection design and monitoring requirements.<\/p>\n\n\n\n

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Explore DC Connection Technology \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Q3 Super Multi Box<\/h2>\n\n\n
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More than just a DC combiner: the smart Q3 Super Multi Box combines PV strings, monitors currents at string level and supports fast fault localization \u2013 especially for PV systems with central inverters and insulation fault requirements.<\/p>\n\n\n\n

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Discover Super Multi Box \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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\"Q3<\/span>
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Request a Project<\/h2>\n\n\n
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Planning a large-scale PV system or looking to improve monitoring on the DC side of an existing installation? Send us your project data \u2013 we will check string count, protection concept, interfaces and the suitable design. <\/p>\n\n\n\n

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Send Project Request \u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Download Area<\/h2>\n\n\n
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Datasheets, technical documents, certificates and further information on Q3 connection and safety technology are available in our download area \u2013 clearly structured and directly accessible. This section is updated regularly. <\/p>\n\n\n\n

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Open Downloads
\u2192<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Q3 Super Multi Box Demo Dashboard | PV String Monitoring for DC-Combiner Live demo of the web interface The demo dashboard gives you a first impression of the PV String Monitoring functions of the Q3 Super Multi Box. The demo is based on a real test system and shows how individual PV strings, operating data… <\/p>\n","protected":false},"author":1,"featured_media":0,"parent":7422,"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-8482","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/8482","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=8482"}],"version-history":[{"count":3,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/8482\/revisions"}],"predecessor-version":[{"id":8487,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/8482\/revisions\/8487"}],"up":[{"embeddable":true,"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/pages\/7422"}],"wp:attachment":[{"href":"https:\/\/q3-energie.de\/en\/wp-json\/wp\/v2\/media?parent=8482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}