Seaward Solar Power Clamp | PV test clamp

Contact Instrument Solutions

The Seaward Solar Power Clamp is especially designed for installers and technicians interested in power measurement and analysis on photovoltaic AC & DC systems along with carrying out diagnostic system checks.

As PV systems have a lifetime of over 25 years, periodic inspection and testing is necessary to ensure that they are operating efficiently. Most inverters have a lifetime much shorter than that of the entire system and so require particular attention as part of system inspection and testing, to ensure optimal system return on investment and power output.


  • DC power measurement
  • AC and AC + DC true continuous power (RMS) reading
  • Power factor
  • Total harmonic distortion and 1 to 25th harmonics
  • Phase rotation indication
  • Measure current and voltage
  • Smart data hold and peak hold
  • Non-contact voltage indicator

In order to ensure the maximum yield from a PV system it is important to check the efficiency of the conversion of DC power generated by the PV modules to AC power fed into the electrical installation. Efficiency is determined by measurement of both the voltage and current on the DC and AC sides of the inverter and using the measured values to calculate the DC and AC power. Alternatively, the DC or AC power can be measured directly on either side of the inverter in seconds using the Seaward Solar Power Clamp. The Power Clamp simply clips over the cable to measure current and the supplied in-line connectors can be used to measure the DC voltage whilst the PV modules are connected to the inverter, giving an accurate true RMS reading of the power whilst the system is operational.

The Solar Power Clamp can be used when installing a PV system to ensure the inverter is operating correctly or for maintenance and troubleshooting on the PV system after commissioning. If a PV system isn't generating the expected level of power under known irradiance and temperature conditions, this may indicate a fault with one or more components in the system.

Similarly, the presence of harmonics on the AC output of an inverter may indicate a fault within the inverter. In addition to power and efficiency measurements, the harmonic analysis function of the Solar Power Clamp can be used as a means of detecting faults within the inverter.


Measurement parameters     Active power, voltage, current, frequency, harmonics (1 to 25), inrush current, resistance and capacitance.

Safety     IEC 61010

Power requirement      Single 9 V battery

Battery life     100 hours (alkaline battery)

Dimensions      87 mm x 239 mm x 51 mm

Demonstration video

Seaward Solar Power Clamp product overview

Support documents

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Seaward Solar Power Clamp user manual.pdf Seaward Solar Power Clamp user manual
Technical document
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Seaward Solar Power Clamp data sheet.pdf Seaward Solar Power Clamp data sheet
Technical document
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Common customer questions & answers

QQuestion Do you need to be qualified electrician to carry out solar panel testing?
AAnswer There is no legislation laid down that says you have to be a qualified electrician to undertake this type of work, but it would be recommended that the person or person’s undertaking the measurements are competent engineers with electrical installation / testing knowledge and have an understanding of the readings from the PV system.
QQuestion Is periodic inspection and testing of PV installations necessary? If so, why?
AAnswer The verification of system performance and energy output from the panels is particularly important and is a major reason why periodic verification and testing of the system is equally important – as well as being essential to comply with some warranty and PV system guarantees.

Undetected faults may also develop into a fire hazard over time. Without fuse protection against such faults, elimination of a fire risk can only be achieved by both good system design, careful installation with appropriate inspection and testing.