NiuBoL PV Weather Stations Applied in a Rooftop Solar Project in Bangladesh

NiuBoL supplied three photovoltaic weather station systems for a rooftop solar monitoring project in Bangladesh. The stations were installed near PV arrays so the project team could record the weather variables that influence module temperature, solar irradiance and operating conditions: wind speed, wind direction, air temperature, humidity, pressure, rainfall, solar radiation and PV module temperature.

For a PV project, a weather station is not a decorative accessory. It is the environmental data layer of the monitoring system. When inverter output changes, the operator needs local evidence to separate weather-driven variation from module soiling, thermal loss, shading, wiring issues or equipment faults. The value of the station depends on sensor placement, stable data acquisition and a communication path that the owner or integrator can maintain.

Project Configuration and Sensor Roles

The Bangladesh project used a separated sensor architecture rather than a single compact sensor. The configuration includes the NBL-W-SS wind speed sensor, NBL-W-DS wind direction sensor, NBL-W-LBTH atmospheric temperature, humidity and pressure sensor, NBL-W-RS tipping bucket rain gauge, NBL-W-HPRS pyranometer, NBL-W-PPT-100 PV module temperature sensor and NBL-D-PH-1 data logger.

Position of the Station in the Solar Monitoring System

The station sits at the front end of the PV monitoring architecture. Sensors collect site variables, the NBL-D-PH-1 data logger receives the signals, and the data can then be displayed locally or transferred to a monitoring platform according to the project interface. This structure gives the owner a time-aligned weather record instead of relying only on regional forecasts or occasional manual readings.

The rooftop installation photos show the station located close to the PV array. That is important because rooftop microclimate can differ from ground-level weather. Air movement, reflected heat, building surfaces and partial shading can change local measurement conditions. During final acceptance, the installer should record sensor height, orientation, horizontal leveling, cable routing, grounding and any possible shading near the pyranometer.

Communication and Integration Notes

NiuBoL weather sensors can be selected with project-oriented outputs such as RS485, Modbus RTU, pulse or analog signals depending on the model and order configuration. For PV monitoring systems, RS485 / Modbus RTU is commonly used because it can connect to data loggers, RTUs, PLCs or third-party monitoring software. Each sensor on an RS485 bus should have a unique address, consistent baud rate and documented register mapping.

Many field problems come from installation details rather than from the sensing principle. Loose terminals, reversed A/B wiring, duplicated addresses, water entering a gland, poor shielding or unclear platform units can make good sensors appear unstable. The commissioning process should therefore read each sensor locally first, confirm values against site conditions, then connect the complete station to the upper monitoring system.

Why These Parameters Matter for PV Operation

Solar radiation provides the reference for how much sunlight is available. Module temperature explains part of the difference between available radiation and electrical output. Wind speed and direction help interpret cooling and rooftop exposure. Temperature, humidity and pressure provide the basic weather context. Rainfall shows when cleaning, cooling or drainage-related events may affect performance records.

This combined dataset allows a project team to ask better operational questions. If radiation is strong but output is lower than expected, the team can check module temperature, soiling history and inverter data. If output drops during a rain event, the team can separate environmental change from equipment alarms. If module temperature rises unusually under moderate radiation, mounting ventilation or localized heat retention may need inspection.

Installation and Acceptance Checklist

• Keep the pyranometer level and free from mast, cable or building shade during key solar hours.

• Mount the PV module temperature sensor with stable contact on the selected module surface or backsheet.

• Install wind sensors away from avoidable rooftop obstruction and record the wind direction reference.

• Level the tipping bucket rain gauge and keep it away from splash zones and roof drainage disturbances.

• Check enclosure sealing, cable glands, grounding and strain relief before long-term operation.

• Verify every channel in the data logger with clear names, units and timestamps.

Summary

The Bangladesh PV weather station project shows how a solar monitoring system benefits from local environmental data. By combining wind, atmospheric, rainfall, solar radiation, module temperature and data logging modules, the station gives the project team a clearer basis for performance review and maintenance decisions. For similar PV projects, the RFQ should define sensor list, output protocol, power supply, mounting structure, cable length, platform interface and acceptance records before installation begins.