7. IV Curve Trace Testing
An IV curve trace is a crucial test that helps identify the performance of a solar PV module under various conditions.
By measuring the current and voltage at different points on the IV curve, solar professionals can obtain accurate and
reliable data to optimize the system's efficiency and identify any issues. The test is typically performed using
specialized equipment, such as Seaward testing equipment, and involves turning off the inverter and
disconnecting the PV strings.
Northern Electric & Power Inc. (NEP) rapid shutdown devices are unique in that they allow for quick and easy
performance of the IV curve trace test on a string level without the need to disconnect each rapid shutdown. NEP
achieves this by saving the power state of the device, which allows a small safe current to continue traveling through
the string when it is disconnected, powering the devices and running the test. It is important to follow all
manufacturer's instructions and safety guidelines during the test to prevent damage to the system and ensure the
safety of personnel. For detailed instructions on how to perform an IV curve trace with NEP's Rapid Shutdown
Devices and Seaward testing equipment, please refer to the white paper "IV Curve Trace with Northern Electric
Power (NEP) Rapid Shutdown Devices." Following the outlined steps will help ensure that the IV curve trace test is
performed accurately and reliably, allowing solar professionals to obtain the data needed to optimize the system's
efficiency and identify any issues that may affect performance.
Equipment Required:
To perform an IV curve trace, the following equipment is required:
1. NEP RSD (PVG-2/PVG-3)
2. Seaward testing equipment
3. A Functioning Solar String Inverter
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