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084f2db8c6 The collector current of Q1 follows the emitter current and drops less voltage across R1 thus reducing Vgs of Q3 and turning it off. While this may seem very HOT to the touch, it is still cool to the transistor that is rated for a junction temperature of 175C. Current Limiting Current limiting is provided by the solar panel it is not a commonly understood fact that the solar panel tends to be a constant current device. "maybe a stupid question but it doesn't look like the pot (r2) is connected right? i wouldn't think" Arduino Digital Voltmeter 0V to. I am very interested with this circuit as our study is also related with charge controllers. All Rights Reserved. I tried to simulate the circuit with multisim however, diode 6A4 is not available at multisim. Therefore, the control does not need current limiting. Posted on November 12th 2015 4:37 am Log in to Reply Mars Chathura The controller will easily handle your panel as it is half of the output specified by the designer. I switched to an Astron 35A supply and that is what I used for the test data on the second graph (green trend).