I need to do an experiment in which I solder a resistor to the backsides of two series-connected cells of a commercial PV module, to simulate shunt resistance, then measure the I-V curve of the module at various shunt resistance levels for that one cell. Once I open the poly backsheet, how can I remove the encapsulant from an area of the cell backside, large enough to solder a wire? I can probably scrape most of the encapsulant away, but getting down to the clean metallization will be the challenge.
Thanks
Photonpal
The solar panel backsheet is placed under repeated mechanical and environmental stress and so it must perform it’s purpose well to ensure the overall longevity of the entire panel. Typical photovoltaic (PV) modules have the layer structure shown in the image below. A backsheet, usually made of a polymer or a combination of polymers, is used to cover the back of solar PV modules. The main function of this layer is to provide electrical isolation of internal circuitry with the external environment. Therefore, damage may cause a serious safety hazard.
Thanks for pointing out the safety hazard. In this case, I am a researcher studying mismatch effects within modules, so going through the backsheet to add resistance in parallel with a cell will be done very carefully and the module will be recycled after this experiment. As you mentioned, the packaging must be very robust, and that's why I'm asking how best to work my way down through backsheet and encapsulant so I can solder a wire to the back of the cell.
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