Find disconnects in PV strings

The Z200 PV Analyzer is multi-function tester, that can also be used to quickly find disconnects in PV strings

The instrument will measure the low-frequency impedance of the PV string connected. The condition for a PV system disconnect is a string impedance at low frequencies, with a value higher than 10 kΩ. The test is easy to carry out, and within 30 seconds the analyser can find disconnects in PV strings

The testing principle evolves around testing the “earth capacitance” between the disconnected PV module circuits and the ground below the system. Cable capacitance also plays a role, so the analyzer is programmed to filte rout this effect.

Solar PV fault finding with high accuracy

The disconnect test is used to measure the position of a disconnect in a string of solar PV modules. The instrument will measure the low-frequency impedance of the PV string connected. The condition for a PV system disconnect is a string impedance at low frequencies, with a value higher than 10 kOhm.

The measurement takes about 20 seconds, and it is probably the fastest way to measure the position of a disconnect. With the Z100 and Z200 PV Analyzer equipment, a more systematic approach may be carried out.

Cable Break Tester

A) Tone generator and amp probe to detect break position
B) Direct measurement of break position

Whenever a string if is not performing to its specifications, the first step is usually to measure the impedance of the solar panel string. If the impedance is very high, say 10 kΩ, the user should suspect a PV disconnect in the system, and refer to the Disconnect application of the Z200 PV Analyzer.

Normally troubleshooting can be time-consuming if individual solar panels need to be checked, but with the Z200 PV Analyzer, it is, however, possible to measure the position of the PV disconnect directly. Using the Z200 PV Analyzer, therefore, allows solar PV service providers to save time and money during troubleshooting in the field.