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Fluke GFL-1500 Solar PV Ground Fault Locator

Fluke
SKU: FLUKEGFL1500

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Key Features
  • Identifies and locates active ground faults in solar PV systems rated up to 1500V
  • Reduces troubleshooting time with easy-to-follow traceable signal
  • CAT III 1500 V DC/CAT IV 600 V rated transmitter and receiver

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Fluke GFL-1500 Solar PV Ground Fault Locator

The Fluke GFL-1500 Ground Fault Locator is a frontline troubleshooting tool designed to help technicians quickly identify hard ground faults in solar photovoltaic (PV) systems rated up to 1500V. Unlike traditional fault-finding methods that can be time-consuming, complicated and often rely on guesswork, the GFL-1500 streamlines this process by injecting a traceable signal directly into the PV circuit, allowing technicians to find faults faster and more accurately. Once the signal is introduced into the circuit, technicians use the signal tracing clamp or receiver to follow the path of the signal right up to the fault location. This reduces downtime, improves efficiency, and enhances the accuracy of maintenance and repair work on solar installations.

 

System components

The GFL-1500 features a three-piece system that consists of

  • GFL-1500 Transmitter – injects the traceable signal into the PV array.
  • GFL-1500 Receiver – detects the signal along the array, guiding technicians to the fault location.
  • GFL-1500 Signal Tracing Clamp – enables non-contact detection, improving workflow safety and efficiency.

Together they improve workflow safety and efficiency, providing an end-to-end solution that not only confirms the presence of a fault but also guides users directly to its exact location. Designed for modern solar environments, the GFL-1500 meets stringent international safety standards and is rated CAT III 1500 V and CAT IV 600 V, making it safe to use in high-voltage environments and gives site managers greater assurance in system performance and uptime.

FaultTrack™ Technology

At the heart of the GFL-1500 lies Fluke’s FaultTrack™ Technology, which generates a traceable signal through the active fault path. Technicians can follow this signal from the transmitter, through the PV circuit, to the exact point of failure. In large or complex solar arrays, this technology eliminates the guesswork and reduces reliance on site diagrams, helping technicians identify faulted strings and branches with remarkable precision. The combination of non-contact tracing and advanced diagnostics makes the GFL-1500 one of the most effective and user-friendly fault locators on the market.

Basic Diagnostic Functions

The GFL-1500 has several dignostics functions made to streamline fault detection in solar PV systems. The first is Analyse function, which measures the open-circuit voltage between the positive and negative terminals, as well as from each terminal to ground. If a fault exists, the system estimates the fault resistance and can even approximate the fault location when the number of modules per string is entered. The next is Fault function. Once activated, the GFL-1500 injects a traceable signal that technicians can follow using the clamp or receiver. This function allows for quick and precise fault pinpointing without needing to isolate strings or disconnect conductors unnecessarily.

For cases where a conductor break (rather than a ground fault) is causing the issue, Open Circuit function helps trace where the open circuit occurs. It is particularly useful for diagnosing inactive strings that produce no current or fail to trigger ground-fault detectors. And lastly, Mapping function is ideal for sites with poor or outdated system documentation. It enables users to trace healthy strings, confirm wiring layouts, and verify system connections, all without relying on incomplete or inaccurate site maps.

Applications Across the Solar Industry

The Fluke GFL-1500 is purpose-built for:

  • Solar O&M (Operations and Maintenance) teams
  • Commissioning engineers
  • System integrators
  • Utility-scale and rooftop PV system technicians

It is especially effective for detecting faults that cause inverter shutdowns, leakage current alarms, or performance drops. During commissioning, it helps confirm wiring integrity and detect accidental ground paths before system energisation. By simplifying fault-finding, the GFL-1500 improves system uptime, increases energy yield, and boosts site reliability.

 

Fluke Premium Care Plans

The Fluke Premium Care Plan aims to reduce the cost of ownership of select Fluke products by eliminating the service and support charges, with the Care Plan available as a one year or three year option. Included in the care plan is one annual calibration per year at a Fluke Authorised Service Centre. If any accessories originally shipped with the product are discovered to be defective, these will be replaced free of charge once a year under the care plan.

If the product is accidentally damaged, then repair of the tester will also be covered in the care plan, providing users with peace of mind should any unforeseen accidents happen.

With the Fluke Premium Care Plan, the calibration, repair, collection, and delivery of the product will expedited, reducing the downtime for the user.

Simply check the one year or three year service plan when placing your order, and your new instrument will be protected with Fluke premium care.

More on the system components

  GFL-1500 Transmitter GFL-1500 Receiver GFL-1500 Clamp
Measurement Category CAT III 1500 V DC / CAT IV 600 V CAT III 1500 V DC / CAT IV 600 V Not category rated. Use on insulated conductors only, up to 1500 V
Operating Voltage 1500 V DC / 600 V AC 1500 V DC / 600 V AC Non-contact. Use on insulated conductors only, up to 1500 V
Trace Signal Operating Frequency FAULT & MAP: 6.25 kHz
OPEN: 32.764 kHz		 FAULT & MAP: 6.25 kHz
OPEN: 32.764 kHz		  
Trace Signal Indications Graphical display, audible beep Numeric, bar graph display, audible beep, LED AC current
Trace Signal Current Output (typical) FAULT & MAP (Array HIGH): 30 mA RMS
FAULT & MAP (Array LOW): 6 mA RMS
Unit HIGH: 120 mA RMS
OPEN HIGH: 100 mA RMS
OPEN LOW: 30 mA RMS		    
Trace Signal Voltage Output (typical)

FAULT & MAP: Unit HIGH: 30 V RMS
OPEN HIGH: 30 V RMS
OPEN LOW: 25 V RMS

    
Voltage range/Rosolution (Analyse) Range: 0-1500 VDC
Resolution: 1V
No voltage measurement if high capacitance & resistance detected		    
Range Detection (typical)   FAULT & MAP Array Mode: up to 4.75 m (15.6 ft)
FAULT & MAP Unit Mode: up to 5.9 m (19.4 ft)
OPEN Mode: up to 2.7 m (8.9 ft)		  
Resistance Ranges (Analyse)

≈ <5 kΩ (FAULT)
≈ 10 kΩ (FAULT)
≈ 50 kΩ
≈ 100 kΩ
≈ 500 kΩ
>1 MΩ

No resistance reange if high capacitance & resitance detected

 Range: 0–1500 V DC
Resolution: 1 V
No measurement if high capacitance & resistance detected		  
AC Current Measurement     Range: 150 mA
Resolution: 0.1 mA
Max Conductor Diameter: 61 mm
Display Graphic LCD Display with front light Segment LCD Display with back light Segment LCD Display with back light
Operating temperature -20 °C to 50 °C -20 °C to 50 °C -10 °C to 50 °C
Operating humidity (non-condensing) 95 %RH: 0 °C to <30 °C
75 %RH: 30 °C to <40 °C
45 %RH: 40 °C to 50 °C
Operating altitude 0 to 3,000 m
Storage altitude 0 to 12,000 m
Storage temperature and humidity (without batteries) -20 °C to 70 °C, <95 %RH -20 °C to 70 °C, <95 %RH -40 °C to 60 °C, <95 %RH
Transient protection 0.00 kV (1.2/50 μs surge)    
Pollution degree 2
IP rating IP54 IP54 IP30 (Jaw Closed)
Drop test 1 m

part number: FLUKE-GFL-1500

 

Key features

  • Identify and locate active ground faults in PV systems
  • Reduce troubleshooting time with easy-to-follow traceable signal
  • Decrease exposure to hazards with non-contact tracing
  • Analyse, Fault Tracing, Open Circuit, and Mapping functions
  • CAT III 1500 V DC/CAT IV 600 V rated transmitter and receiver

Specialists In Solar PV Test Equipment

Watch the video above to see how we can help you find the right solar pv test equipment & get in touch on 0113 248 9966 or sales@test-meter.co.uk.

As a leading Solar PV Test Equipment and Solutions provider in the UK, we have a wide range of expertise. Whether you're conducting simple commission tests, small-scale 1000V solar PV rooftop installations or 1500V commercial solar farms to more in-depth IV curve trace analysis, our team ensures your enquiry is looked after from start to finish, providing you with the perfect solution.

Find the best solution for your application and budget through:

  • Onsite-demo/remote consultations on request
  • 'Try Before You Buy' and hire options available
  • After-sales care that provides ongoing calibration and servicing
  • Finding the optimal software package, ensuring the correct reporting and data functionality for your needs

Can't find the right Solar PV Test Equipment or solution? We're on hand to help, please get in touch on 0113 248 9966 or sales@test-meter.co.uk

What's In The Box?

  • GFL-1500 Transmitter
  • GFL-1500 Receiver
  • GFL-1500 Clamp
  • MC4 Test Leads 1500 V rated test leads
  • Alligator clips
  • MC4 unlocking tool
  • Soft carrying case
  • Backpack style shoulder strap
  • 14x AA Alkaline batteries
Specification
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Transmitter Specifications

Measurement Category: CAT III 1500 V DC / CAT IV 600 V

Operating Voltage: 1500 V DC / 600 V AC

Trace Signal Operating Frequency:
FAULT & MAP: 6.25 kHz
OPEN: 32.764 kHz

Trace Signal Indications: Graphical display with audible beep

Trace Signal Current Output (Typical):
FAULT & MAP:
Array HIGH mode: 30 mA RMS
Array LOW mode: 6 mA RMS
Unit HIGH mode: 120 mA RMS
OPEN:
Unit HIGH mode: 100 mA RMS
Unit LOW mode: 30 mA RMS

Trace Signal Voltage Output (Open Circuit, Typical):
FAULT & MAP:
Unit HIGH mode: 30 V RMS
OPEN:
Unit HIGH mode:
30 V RMSUnit LOW mode: 25 V RMS

Voltage Range / Resolution (ANALYZE):
Range: 0–1500 V DC
Resolution: 1 V
No voltage measurement if high capacitance and resistance detected

Resistance Ranges (ANALYZE):
≈ <5 kΩ (FAULT)
≈ 10 kΩ (FAULT)
≈ 50 kΩ
≈ 100 kΩ
≈ 500 kΩ
≈ >1 MΩ
(No resistance range if high capacitance and resistance detected)

Transient Protection: 10.00 kV (1.2/50 μS surge)

Display Type: Graphic LCD display with front light

Operating temperature: –20 °C to 50 °C (–4 °F to 122 °F)

Operating humidity (non-condensing):
95 %RH (0 °C to <30 °C)
75 %RH (30 °C to <40 °C)
45 %RH (40 °C to 50 °C)

Operating altitude: 0 to 3000 m (9843 ft)

Storage altitude: 0 to 12 000 m (39 371 ft)

Storage temperature and humidity (without batteries): –20 °C to 70 °C (–4 °F to 158 °F), <95 %RH

Pollution degree: 2

IP rating: IP54 (non-operating)

Drop test: 1 m (3.28 ft)

Power supply: 8 × AA IEC LR6 alkaline or NiMH rechargeable batteries

Battery life (typical):
FAULT & MAP Array Mode: ~15 h
FAULT & MAP Unit Mode: ~8 h
OPEN Unit Mode: ~15 h

Low battery indication: Yes

Dimensions (L × W × H): 244 × 180 × 106 mm (9.6 × 7.0 × 4.2 in)

Weight (with batteries): 2.04 kg (4.5 lb)

Receiver Specifications

Measurement Category: CAT III 1500 V DC / CAT IV 600 V

Operating Voltage: Non-contact, safe for use on insulated conductors up to 1500 V

Trace Signal Indications: Numeric and bar graph display with audible beep and LED indicators

Range Detection (Typical):
FAULT & MAP (Array Mode): Max distance via air: 4.75 m (15.6 ft)
FAULT & MAP (Unit Mode): Max distance via air: 5.9 m (19.4 ft)
OPEN (Unit Mode): Max open-air distance: 2.7 m (8.9 ft)

Display Type: Segment LCD display with backlight

Operating temperature: –10 °C to 50 °C (14 °F to 122 °F)

Operating humidity (non-condensing):
90 %RH (10 °C to <30 °C)
75 %RH (30 °C to <40 °C)
45 %RH (40 °C to 50 °C)
Operating altitude: 0 to 3000 m (9843 ft)

Storage altitude: 0 to 12 000 m (39 371 ft)

Storage temperature and humidity (without batteries): –40 °C to 60 °C (–40 °F to 140 °F), <95 %RH

Pollution degree: 2

IP rating: IP54

Drop test: 1 m (3.28 ft)

Power supply: 4 × AA IEC LR6 alkaline or NiMH rechargeable batteries

Battery life (typical): ~16 h

Low battery indication: Yes

Dimensions (L × W × H): 183 × 75 × 43 mm (7.2 × 2.95 × 1.69 in)

Weight (with batteries): 0.27 kg (0.6 lb)

Clamp Specifications

Category Rating: Not category rated. Use on insulated conductors only (up to 1500 V).

Operating Voltage: Non-contact; use on insulated conductors only, up to 1500 V.

Trace Signal Indication: AC current detection

AC Current Measurement:
Range: 150 mA
Resolution: 0.1 mA
Maximum conductor diameter: 61 mm (2.4 in)

Display: No display (data viewed via receiver)

Operating temperature: –10 °C to 50 °C (14 °F to 122 °F)

Operating humidity (non-condensing):
90 %RH (10 °C to <30 °C)
75 %RH (30 °C to <40 °C)
45 %RH (40 °C to 50 °C)

Pollution degree: 2

IP rating: IP30 (jaw closed)

Drop test: 1 m (3.28 ft)

Power supply: 2 × AA IEC LR6 alkaline batteries

Battery life (typical): >150 h (without backlight and spotlight)

Dimensions (L × W × H): 257 × 116 × 46 mm (10.1 × 4.6 × 1.8 in)

Weight (with batteries): 0.6 kg (1.32 lb)
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