First of all, the ISC of a solar panel is the short-circuit current , that is, the maximum intensity that can exist between the terminals of the solar panel.
What is the Isc of a solar panel?
The short-circuit current is produced with the generation and collection of light carriers that are generated, for this reason, this value varies depending on the cell and the light irradiation . If when measuring this value it does not coincide with the one indicated in the panel specifications, it is slightly lower, do not worry, fog can affect this value.
When you want to start up a solar installation, you have to know this short-circuit current ISC, as well as other parameters such as open circuit voltage (VOC), maximum power (PM), panel efficiency, etc.
What factors depend on the ISC?
– Solar cell area
– Light intensity
– Spectrum of incident light
– Optical properties of the solar cell
How is the measurement done?
To measure the ISC of a panel, you can use a digital multimeter (DMM), which uses cables to measure the current, or a current clamp (more recommended) that uses clamps that close around the cables and measure their current. It is not recommended to measure the short-circuit current of several panels connected to each other, the measurement must be made on individual panels .
To perform reliable measurements, the measurement must be made on panels with good sun exposure. These values will be closer to those specified by the manufacturer. In the same way, it is also recommended to connect the module in the shade or covered, to avoid sparks that could damage the connectors.
When using a multimeter, make sure you make the correct connections. With the panels already connected it is easier and less dangerous to use the clamps.