Photovoltaic Sensors

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Project Description

Photovoltaic sensors

The Best IoT Sensing Solutions—Monitoring and rapid shutdown technology


Photovoltaic sensors

Photovoltaic sensor:Module-level monitoring

Module-level monitoring provides the most precise and detailed information on the performance of solar power system, it helps to identify module problems such as partial shadings, PIDs or blown diodes. With such solution, O&M teams are able to save their fault-finding time and increase maintenance efficiency.

The sensor unit is the core component of the NxSensor system, it is a MLPE (Module-Level Power Electronics) device that can be integrated into different forms of solar panel’s junction box or add-on/retrofit box, and it continuously measures voltage and temperature of the associated PV module.

Besides monitoring, the sensor unit also supports modulelevel rapid shutdown functionality, complying with NEC 2017 690.12 RSD requirements.

Monitor a solar panel’s performance

We use the integrated junction box to illustrate how it works. For add-on/retrofit box, the working principle is similar, the difference is in wiring connections and the box shells. The sensor unit has a pair of thimbles sticking onto the positive and negative sides of the conducting strips in the junction box, respectively. They are used to sample the panel’s voltage output. Since all panels on the same string have same current, voltage is an important index to measure a panel’s performance. The sensor unit also has an onboard temperature sensor, it is used to measure the temperature of a junction box. Defective bypass-diodes in junction box are a common failure, they most often show up as rising temperature at early stage.

RMS algorithm provides a slow moving output so that it can be easily measured by a low speed system, greatly simplifying vibration monitoring and measurement works.

Photovoltaic shutdown

Rapid Shutdown

The National Electrical Code (NEC) applies to the construction of PV systems installed on buildings. The 2014 version of the NEC includes a requirement for rapid shutdown of controlled conductors outside the PV array boundary. The proposed 2017 NEC modified that rule to effectively require shutdown at the module level, which could have a dramatic impact on how systems are designed and installed moving forward.

Key Features

• Enable solar PV module-level monitoring;
• Enable solar PV module-level rapid shutdown;
• Wireless connectivity for module-level communication;
• Assign digital ID and RF-based solar panel management;
• Compact size, various forms of junction box supported;


• Monitors the voltage and temperature data of each module, giving insight into module-level performance with unprecedented granularity.
• Identifies erroneous connection and associated electrical arcs in the junction box, which helps to improve the reliability and safety of a system.
• Complies with rapid shutdown requirements of 2017 NEC 690.12, ensuring the safety of system installers, operators and emergency responders.
• Modules send data to a gateway using a wireless mesh network architecture – HOHWave®, it is a lowcost and extensible communication system.


Product Guidemodel SJBmodel ABXmodel ABM
Product RangeNX-SXT-SJB-000U-301NX-SXT-ABX-000U-301NX-SXT-ABM-000U-301
Voltage range7 V ~ 60 V, ±0.2 V7 V ~ 60 V, ±0.2 V7 V ~ 60 V, ±0.2 V
Temperature range-30°C to +75°C, ±0.5°C-30°C to +75°C, ±0.5°C-30°C to +75°C, ±0.5°C
Radio2.4 GHz ISM band2.4 GHz ISM band2.4 GHz ISM band
Wireless protocolHOHWave ® MESH NetworkHOHWave ® MESH NetworkHOHWave ® MESH Network
Rated voltage1000 V / 1500 V1000 V / 1500 V1000 V / 1500 V
Rated current15 A15 A15 A
Max. Input voltage90 V90 V90 V
Power consumption< 50 mW< 50 mW< 50 mW
Battery lifetime3~5 years6~8 years3~5 years
Dimensions98.8 mm x 17.4 mm x 78.5 mm138 mm x 28 mm x 25 mm105.1 mm x 18.5 mm x 18.5 mm
-30 °C to 75 °C-30 °C to 75 °C-30 °C to 75 °C
Storage temperature-40 °C to 85 °C-40 °C to 85 °C-40 °C to 85 °C
IP RatingIP68IP68IP68
MC-4/MC-4 compatibleYesYesYes


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Due to the above, the starting point of our job is to recognize the actual project target, helping our customers address the multiple aspects of the whole project, from installation, user experience to maintenance.


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We would quickly develop a concept-of-approval prototype to realize what clients need, in order to validate the requirements

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We would implement comprehensive testing via trial production, ensuring zero risk of mass-production failure.

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Mass productions come as carefully planned, informed of our customers, with daily logging data shared so that shipment schedule could be reassured.

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