The Disconnect application can perform the following measurements and tasks at the instrument operators demand:
- Capacitance on positive side
- Capacitance on negative side
- Position of disconnect
- PDF report generator
Solar PV system disconnects can be located within +/- 1 solar panel accuracy. The measurement takes about 20 seconds, and it is probably the fastest way to measure the position of a disconnect. The alternative to using the Z100 PV Analyzer is often to inspect individual modules for faults and internal disconnect, and the PV installer typically spend a lot of time troubleshooting. With the Z100 PV Analyzer equipment, a more systematic approach may be carried out.
Whenever a string if it 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 Z100 PV Analyzer.
Normally troubleshooting can be time-consuming if individual solar panels needs to be checked, but with the Z100 PV Analyzer it is however possible to measure the position of the PV disconnect directly. Using the Z100 PV Analyzer therefore allows solar PV service providers to save time and money during troubleshooting in the field.
In the illustration, the Z100 PV Analyzer is connected to a string of solar panels. It is important to connect the Z100 PV Analyzer to the system ground terminal also. The measurement principle is based on impedance testing across all terminals (patent pending) which allows the user to locate a range of problems, simply by performing a string test – no individual solar panels need to be measured. If there is more than 1 PV disconnect, you may refer to the Z100 cable locator feature to track down all disconnected solar panels in the string.