UNI-T UT381PV Solar Irradiance Meter

We provide a 3-year warranty on this product.

The UNI-T UT381PV solar radiation meter (solar lux meter) is designed to measure solar radiation under both natural and simulated sunlight conditions. It is equipped with two measurement channels for monitoring ambient temperature and solar panel temperature, and a built-in tilt and azimuth sensor for accurately determining the installation direction and tilt angle. The device also supports connectivity with the ‘iENV’ mobile app and can be integrated with the UT541 15KW photovoltaic inverse curve analyser. It is widely used for the installation and maintenance of solar panels in photovoltaic power stations, as well as for product testing in photovoltaic system laboratories.
Are you looking for a reliable tool to maximise the efficiency of photovoltaic systems? The UNI-T UT381PV is a professional solar irradiance meter, designed specifically for installers, inspection technicians and engineers in the solar energy sector. The UT381PV provides you with all the data required for the correct design, inspection and maintenance of solar power stations.


Product specifications:

- comprehensive 4-in-1 measurement: irradiance, temperature (ambient + panel), tilt (inclination) and azimuth
- high durability for field work: IP65 rating (dust-tight and splash-proof), UV-resistant casing and resistance to drops from 2 metres
- Smart connectivity: Bluetooth connection to the iENV mobile app for real-time data monitoring and report export (PDF/CSV). Can be integrated with the UNI-T UT541 PV analyser
- UV-resistant casing
- dual temperature measurement: the package includes an external suction-cup temperature probe for accurate monitoring of the solar panel’s temperature
- Audible and visual tilt alarm: alerts you if the installation angle deviates from the set values
- Quick-release mount


Technical specifications:

- Solar irradiance: measurement range / resolution / accuracy
0 ~ 1400 W/m2 / 1 W/m2 / ±(5.0 of the measured value + 5 digits)
(0~500 Btu/(ft2 · h)) / 1 W/m2 / ±(5.0 of the measured value + 5 digits)

- Temperature measurement: +40°C to 120°C / 0.1°C / ±1°C (-10 to 75°C)
- tilt measurement: -90.0° to +90.0° / 0.1° / ±1.5°C (-50 to 50°C), ±2.5°C (other)
- azimuth measurement (compass): 0° to 360° / 1° / ±7°
- internal memory: up to 12,800 sets of measurements
- Data logging interval: adjustable from 1 second to 60 minutes
- Signalling: LED indicator and audible alerts
- Automatic switch-off: after 30 minutes of inactivity
- Compass calibration: yes
- Mobile app
- Time setting
- Wireless transmission: Bluetooth, range up to 100 m in open space
- Operating environment: -20 °C to 60 °C, ?90% RH (non-condensing)
- Durability: IP65 certification, 2-metre drop test

- Power supply: 2× AA batteries (approx. 95 hours’ operating time)
- Dimensions: 201 × 54.2 × 33.7 mm
- Weight: approx. 212 g (excluding batteries)
- Standard quantity per carton: 2 units

Package contents:
- UNI-T UT381PV unit
- suction-cup temperature probe (for measuring panels)
- mounting bracket for solar panels (quick-release)
- fabric protective case
- batteries: 2× AA


MANUFACTURER: UNI-TREND