Question 1

What parameters should be monitored in a rooftop solar PV system?

Accepted Answer

For most performance-focused rooftop PV systems, plane-of-array (POA) irradiance and PV module temperature are key measurements. POA irradiance records the solar radiation received by the array, while module temperature helps explain temperature-related power changes. Ambient temperature, wind speed, humidity and rainfall can be added when site conditions or monitoring objectives justify them. The final configuration should reflect the array layout and intended use of the data.

Question 2

How many irradiance sensors does a rooftop solar system need?

Accepted Answer

The number of irradiance sensors depends on the array layout and how representative each measurement point is. A single sensor may be sufficient for a uniform array with the same tilt and orientation. Separate measurement points may be needed when roof sections face different directions, have different tilt angles or experience different shading. Sensor placement should reflect the PV sections being evaluated, rather than simply the total system capacity.

Question 3

Can rooftop solar monitoring explain why a rooftop solar system produces less power?

Accepted Answer

Weather monitoring helps explain output changes, but it cannot identify every fault on its own. Compare irradiance and module temperature readings with inverter power, energy records and equipment status. If output falls as irradiance decreases, weather may explain the change. If output remains lower than expected under comparable conditions, investigate possible shading, soiling, inverter issues or other system faults.

Question 4

Should I choose an integrated solar weather station or individual sensors?

Accepted Answer

An integrated solar weather station can simplify installation when several measurements are needed at one location. Individual sensors may be more suitable for upgrading an existing system, replacing an instrument or adding measurement points to different roof sections. Before purchasing, compare the required parameters, measurement performance, communication interfaces, mounting options and maintenance requirements. The right choice depends on the monitoring objectives and existing system configuration.

Question 5

Where should solar irradiance sensors be installed on a rooftop?

Accepted Answer

Install the irradiance sensor where it represents the PV array being monitored, with minimal shading from parapets, mounting structures or nearby equipment. For POA measurements, match the sensor's tilt and orientation to the relevant array section. For global horizontal irradiance (GHI), install the sensor horizontally. Check the mounting position throughout the year if nearby structures may cast seasonal shadows.

Question 6

Can a solar weather station connect to an existing PV monitoring platform?

Accepted Answer

Integration depends on the sensor outputs, communication protocols, data logger and monitoring platform. Before ordering, confirm interface requirements such as RS485 or Modbus where applicable, along with power supply, data format and communication settings. Do not assume that devices are compatible simply because they use the same interface. Ask the supplier to verify compatibility with the existing equipment and data acquisition system.

Question 7

How often should rooftop solar monitoring sensors be cleaned and calibrated?

Accepted Answer

Cleaning and calibration intervals depend on sensor type, site conditions and manufacturer recommendations. Dusty rooftops may require more frequent cleaning, while coastal or industrial environments can place additional demands on inspection and protection. Check sensor surfaces, mounting hardware, cables and readings regularly. Follow the manufacturer's calibration guidance and project data-quality requirements, and document maintenance to help identify measurement drift over time.

Question 8

How do I choose a suitable rooftop solar weather monitoring system?

Accepted Answer

Start by defining the required measurements, array orientations, site conditions and monitoring platform interfaces. Then compare sensor range, accuracy, long-term stability, environmental protection, communication options and calibration support. Confirm mounting space, cable routing and maintenance access before ordering. Sharing the rooftop layout and monitoring objectives with the supplier helps determine whether an integrated weather station or a combination of individual sensors is more suitable.

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