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Here's the schematic:

The circuit is the equivalent of a solar panel. I'm trying to perform a DC sweep of the voltage at V1 to see how Iout varies as I sweep V1 from 0-15V and get the I-V characteristic curve. Would anyone know hoe to perform this DC sweep? I found this equivalent circuit online so I wanted to play around it. Should I also sweep the DC current source as well? How can I measure the output current? (I've tried connecting a load resistor to the voltage source, but that's not accurate as the current just increases linearly with respect to the voltage)

Your link is broken so it's not possible to comment directly on your circuit.

You might like to look at this in the meanwhile:

https://www.circuitlab.com/circuit/2eu4mu/pv-01/