Solar Clamp Meters
Solar Clamp Meters
Solar clamp meters are specialized electrical measurement instruments designed for safe and efficient testing of photovoltaic (PV) systems under live conditions. Unlike standard clamp meters, solar clamp meters are rated for the high DC voltages and currents found in PV string arrays — often up to 1500 V DC and 40 A or more — and simultaneously measure multiple parameters including DC current, DC voltage, irradiance, and module temperature. This combination makes them the preferred tool for fast, non-invasive commissioning and troubleshooting of solar installations.
A key feature of solar clamp meters is the ability to clamp around DC conductors without interrupting the circuit, allowing measurements to be taken safely on live systems. Many models integrate an irradiance sensor so that string current output can be immediately evaluated against available solar resource, enabling on-the-spot calculation of performance deviation and rapid identification of underperforming strings. Dedicated PV test leads with MC4-compatible connectors further streamline field work.
Typical Applications
- DC string current measurement and balancing during PV system commissioning
- Identification of underperforming strings or modules in operating PV arrays
- Live measurement of DC voltage across strings and sub-strings
- Combined irradiance and current measurement for performance ratio assessment
- Ground fault location in PV DC wiring with dedicated locator models
- Ongoing preventive maintenance inspections of commercial and utility-scale solar plants
Popular Brands
Fluke dominates this category with its dedicated solar clamp meter range, including models with integrated irradiance measurement and MC4-compatible PV test leads. The Fluke 393 CAT III Solar Clamp Meter is rated for systems up to 1500 V DC and is widely used by PV installers and electricians. The Fluke GFL-1500 Solar Ground Fault Locator addresses a critical safety need in large DC array installations by precisely locating ground faults without shutting down the system.
