Solar Irradiance Meter for Solar Farm Maintenance and PV O&M Malaysia
Solar Irradiance Meter for Solar Farm Maintenance and PV O&M Malaysia
Solar farm operation and maintenance involves more than checking whether an inverter is running or whether the PV modules look clean.
When technicians investigate photovoltaic performance in the field, one environmental measurement can provide important context:
Solar irradiance in W/m².
A portable solar irradiance meter allows PV O&M technicians to take spot measurements of incoming solar radiation at different locations during inspection.
For this type of field measurement, the VICI LX-107 Solar Power Meter provides portable W/m² measurement together with useful functions such as MAX/MIN and Data Hold.
Why Measure Solar Irradiance at a Solar Farm?
PV electrical output depends partly on the amount of solar radiation available.
If technicians compare electrical measurements without considering irradiance, they may be comparing results obtained under different sunlight conditions.
For example:
Array A: Tested under strong sunlight.
Array B: Tested after cloud conditions changed.
If the irradiance conditions are different, the electrical results require appropriate interpretation.
Recording W/m² helps establish the solar conditions present during the field measurement.
What Does W/m² Mean?
Solar irradiance is commonly expressed in:
W/m² – watts per square metre
It represents incident radiant power over an area.
This is different from measuring:
PV voltage
PV current
Electrical power output
Module temperature
Illuminance in lux
Each measurement answers a different question.
For PV O&M, irradiance helps answer:
“How much solar radiation was available when this measurement was taken?”
Portable Measurement vs Permanent Monitoring
This distinction is particularly important for solar farms.
A handheld solar irradiance meter and a permanent plant monitoring system do not perform the same role.
Portable Solar Irradiance Meter
Suitable for:
Field spot measurements
Maintenance inspection
Troubleshooting support
Comparing locations
Technician field work
Permanent Solar Monitoring System
Designed for applications such as:
Continuous measurement
Long-term data recording
Plant performance monitoring
Automated system integration
The VICI LX-107 should be viewed as a portable field measurement instrument, not a replacement for a solar farm's permanent monitoring system.
When Is a Portable Irradiance Meter Useful?
A solar farm may already have permanent environmental sensors.
Why would a technician still carry a portable meter?
Because maintenance work often happens at specific locations.
A technician may need to investigate:
A particular PV array
One section of the site
A suspected shading area
Differences between measurement locations
Conditions during an electrical test
Conditions during a maintenance inspection
A handheld instrument can be brought directly to the work area.
Example: Comparing Two PV Areas
Suppose a maintenance team notices a difference between two sections of a solar installation.
Before assuming there is an electrical fault, technicians can consider whether both areas are being evaluated under comparable environmental conditions.
A field record might include:
Location A
Solar irradiance: ______ W/m²
DC voltage: ______ V
DC current: ______ A
Module temperature: ______ °C
Time: ______
Location B
Solar irradiance: ______ W/m²
DC voltage: ______ V
DC current: ______ A
Module temperature: ______ °C
Time: ______
This provides more information than comparing electrical output alone.
Changing Clouds Can Affect Field Comparisons
Solar conditions can change rapidly.
If technicians measure one array and then move to another location, cloud conditions may have changed before the second test.
This is why irradiance should be measured close to the corresponding electrical measurement whenever practical.
For field comparisons, record the time and weather conditions as well.
Sensor Orientation Matters
Solar irradiance measurement is affected by sensor orientation.
If the objective is to understand irradiance relevant to the PV module plane, the sensor should be positioned appropriately for that measurement.
A sensor positioned horizontally may not represent exactly the same incident radiation as an inclined PV module.
Consistent measurement technique is important when comparing locations.
Avoid Accidental Shading
At a solar farm, shading can come from:
The technician
Tools
Vehicles
Equipment
Nearby structures
Vegetation
Other objects
Make sure the sensor is not accidentally shaded during measurement.
A poor measurement technique can create misleading results.
Solar Farm Troubleshooting: What Irradiance Can Tell You
An irradiance meter can help establish whether available sunlight may be influencing the PV measurement.
For example:
Lower Output + Lower Irradiance
Environmental conditions may be contributing to the reduced electrical output.
Unexpected Output + Relatively Strong Irradiance
Technicians may decide to investigate other possible factors.
These might include:
Module contamination
Partial shading
Module condition
Cable condition
Connector issues
String differences
Temperature effects
Inverter conditions
Other electrical problems
The irradiance meter does not identify the fault by itself.
It supplies one important piece of measurement information.
VICI LX-107 for PV O&M Field Work
The VICI LX-107 Solar Power Meter is designed for portable solar radiation measurement.
Key functions include:
W/m² Measurement
Useful for solar irradiance measurements.
BTU Display
Provides an additional unit for relevant applications.
MAX / MIN
Allows technicians to observe maximum and minimum readings during a measurement period.
Data Hold
Allows the displayed value to be held for convenient recording.
Its handheld format makes it suitable for technicians who need to carry measurement equipment around a site.
Why MAX/MIN Can Be Useful Outdoors
Outdoor solar radiation can fluctuate as environmental conditions change.
MAX/MIN can help users observe variations during a measurement period.
However, PV troubleshooting should still focus on the irradiance present at or close to the time of the corresponding electrical measurement.
A maximum reading recorded several minutes earlier should not automatically be treated as the irradiance during a later PV test.
Solar Irradiance Meter vs Thermal Camera
Solar O&M teams may use both.
Irradiance Meter
Measures incoming solar radiation.
Thermal Camera
Shows temperature patterns across equipment or PV modules.
Thermal inspection may help technicians identify areas requiring further investigation, while irradiance measurement provides environmental context.
They perform different jobs.
Solar Irradiance Meter vs PV Electrical Tester
Again, these instruments are complementary.
Solar irradiance meter → environmental measurement
PV electrical tester → photovoltaic electrical measurement
A complete PV O&M procedure may require multiple instruments depending on the maintenance scope.
PV O&M Testing Equipment
A solar maintenance team may use equipment such as:
Solar irradiance meter
PV tester
DC clamp meter
Digital multimeter
Insulation resistance tester
Earth resistance tester
Thermal imaging camera
Temperature measurement equipment
The appropriate instruments depend on the system and maintenance procedure.
Solar Farm Preventive Maintenance
Portable irradiance measurement can also support scheduled inspection.
Instead of recording only:
“PV section inspected – OK”
a maintenance team can record relevant test conditions.
For example:
Date: __________
Time: __________
Weather: __________
Solar irradiance: __________ W/m²
Module temperature: __________ °C
Electrical measurements: __________
Inspection observations: __________
This creates a better technical record for future reference.
Can LX-107 Replace a Pyranometer Monitoring Station?
For a large solar plant requiring continuous and performance-grade environmental monitoring, users should select instrumentation appropriate to that requirement.
The LX-107 is better positioned for portable solar power measurements and field spot checks.
This is an important distinction when selecting equipment.
Do not purchase a handheld meter expecting it to replace an entire permanent solar monitoring installation.
Who Can Use the VICI LX-107?
Potential users include:
Solar O&M Contractors
For field spot measurements during maintenance.
Solar EPC Companies
For solar installation and site measurements.
Electrical Contractors
For solar-related engineering work.
PV Technicians
For portable solar radiation measurement.
Factory Engineering Teams
For large industrial rooftop PV systems.
Universities and Research Teams
For solar radiation-related measurements and experiments.
Solar Irradiance Meter for PV O&M Malaysia
For technicians requiring a portable W/m² measurement instrument, the VICI LX-107 Solar Power Meter can support solar radiation spot measurements during PV inspection and maintenance.
More advanced solar farm performance monitoring or commissioning requirements may require specialised instrumentation.
Selecting the instrument according to the actual measurement objective is essential.
VICI LX-107 Solar Power Meter Supplier Malaysia
MTM Precision supplies testing and measurement equipment for solar installers, PV O&M contractors, electrical companies, factories, engineering teams and industrial users throughout Malaysia.
Customers can contact MTM Precision for VICI LX-107 enquiries and assistance selecting additional solar and electrical testing instruments.
Contact MTM Precision
MTM Precision Sdn Bhd
Website: www.mtmpre.com.my
Email: mtmpre@yahoo.com
WhatsApp: 016-660 7346
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Serving customers throughout Selangor, Kuala Lumpur, Johor, Penang, Perak, Negeri Sembilan, Melaka, Pahang, Kedah, Perlis, Terengganu, Kelantan, Sabah and Sarawak.
Need a portable solar irradiance meter for PV O&M or solar farm field inspection? Contact MTM Precision for VICI LX-107 availability and solar testing equipment enquiries in Malaysia.
08 Sep 2026
