Fluke IRR1-SOL Solar Irradiance Meter

Key Features At A Glance

• Instantaneous solar irradiance measurements from 0 to 1400 W/m² with 1 W/m² resolution
• High-precision mono-crystalline solar sensor designed for photovoltaic array measurement
• Two temperature measurement options: built-in sensor or external suction-cup probe for panel surface temperature
• Integrated compass (0° to 360°) for documenting roof and site orientation referenced to magnetic north
• Inclination sensor with ±0.1° resolution for measuring roof and PV panel tilt from -90° to +90°
• Supports IEC 62446-1 testing, documentation, and maintenance requirements for photovoltaic systems
• Single-handed handheld form factor with high-contrast LCD readable in direct sunlight
• 50-hour typical battery life (>9000 readings) on 4 AA alkaline batteries with 30-minute auto power-off

The Fluke IRR1-SOL is a handheld solar irradiance meter purpose-built for installing, testing, maintaining, and reporting on solar panels and photovoltaic systems. It combines irradiance measurement, temperature measurement, inclination sensing, and an integrated compass in a single rugged tool, allowing a solar installer or technician to capture the four most common site and panel measurements without switching instruments. The high-contrast LCD is designed to be read in direct sunlight, and the unit ships in a protective carrying case with a shoulder strap for field use.

The IRR1-SOL is used for photovoltaic system design and surveying, for measuring installed system performance, and for comparing and diagnosing arrays that are not producing expected output. In the design and surveying phase, the meter is used to determine actual solar irradiance in W/m² at a site and to account for shading when establishing a baseline solar resource. After installation, the irradiance reading is used together with electrical measurements to evaluate the current-voltage (IV) curve of the array. For arrays already in service, the meter provides the irradiance reference needed to verify whether the array is receiving the energy required to generate its rated DC voltage at the inverter input.

ValueTronics has been a trusted source for test and measurement equipment since 1992. Solar irradiance meters, like every instrument we sell, are stored and tested in our own 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois, before they ship. Our in-house technicians handle inspection, functional verification, and condition grading directly — equipment is not drop-shipped or pass-through brokered. When you order a Fluke IRR1-SOL from ValueTronics, the unit shipping to you is the unit our team has handled.

Brand Heritage

Fluke Corporation was founded in 1948 by John Fluke Sr. in Washington state and has been the dominant brand in handheld and field-portable electrical test instruments for decades. Fluke became a subsidiary of Danaher Corporation in 1998, and in 2016 Danaher spun off its industrial businesses — including Fluke — into Fortive Corporation, which remains Fluke's parent company today. The IRR1-SOL fits within Fluke's solar and renewable energy test product family.

Accessories Supplied

• FLK-IRR1-SOL Solar Irradiance Meter
• FLK-80PR-IRR External Temperature Probe with Suction Cup
• C250 Carrying Case with Shoulder Strap
• (4) AA Alkaline Batteries
• User Manual

Product Core & Specifications

Irradiance
Measuring Range	0 to 1400 W/m²
Resolution	1 W/m²
Measuring Accuracy	± (5 % + 5 Digit)
Temperature Measurement
Measuring range (°C)	-22 °F to 212 °F (-30 °C to 100 °C)
Resolution	0.2 °F (0.1 °C) / 1 °F @ >100 °F
Measuring Accuracy	±2 °F (±1 °C) @ 14 °F to 167 °F (-10 °C to 75 °C), ±4 °F (±2 °C) @ -22 °F to 14 °F (-30 °C to -10 °C) and 167 °F to 212 °F (75 °C to 100 °C)
Note: Temperature measurement response time: ~30 sec.
Inclination Angle
Measuring Range	-90° to +90°
Resolution	0.1°
Measuring Accuracy	± 1.5° @ -50° to +50°, ±2.5° @ -85° to -50° and +50° to +85°, ±3.5° @ -90° to -85° and +85° to +90°
Compass
Measuring Range	0° to 360°
Resolution	1°
Measuring Accuracy	± 7°
Note: a) Measurements valid for device inclination between -20° and +20° to horizontal. Outside that range on LCD will be shown "---". b) Result is referred to magnetic north.
Temperature
Operating Temperature IRR1-SOL	-20 °C to 50 °C (humidity <80 %), noncondensing
Operating Temperature 80PR-IRR	-30 °C to 100 °C
Storage Temperature	-30 °C to 60 °C (humidity <80 %)
Altitude	0 m to max. 2000 m
Electromagnetic Compatibility (EMC)
International	IEC 61326-1: Portable Electromagnetic Environment; CISPR 11: Group 1, Class A
Korea (KCC)	Class A Equipment (Industrial Broadcasting & Communication Equipment)
USA (FCC)	47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103.
Protection
IP Protection	IP40
Power Supply & Battery Life
Batteries	4 AA Alkaline Batteries
Battery Life (typical)	50 hours (> 9000 readings)
Auto Power Off	30 minutes
Dimensions
L x W x H	5.90 x 3.14 x 1.37 in (150 x 80 x 35 mm)
Weight	0.5 lb (231 g)

Important: Compass readings are valid only when the device is held between -20° and +20° from horizontal; outside that range the display shows dashes. Compass result is referenced to magnetic north.Important: Compass measurements are valid for device inclination between -20° and +20° to horizontal. Outside that range the LCD will show "---". Compass result is referred to magnetic north.Important: Temperature measurement response time: ~30 sec.Important: This equipment is not intended for use in residential environments and may not provide adequate protection to radio reception in such environments (CISPR 11 Group 1, Class A).Recommended pairing: use the FLK80PR-IRR external temperature probe (included) for panel surface temperature measurements, in addition to the built-in sensor for ambient readings.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.