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Please excuse me for my silly question, I have basic understanding of electrical circuits.

I came across a solar charge controller which was rated for both 12 v and 24 v. My understanding is that charge controllers work by cutting off beyond a particular voltage (like beyond 14.4 volt for 12 volt charge controller). So how can such a charge controller "figure" out the attached battery system voltage?

If the answer requires a diagram, I'll be happy to look into that, I can understand basic electric circuits (involving diode, cap, resistor, etc)

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If it has a microcontroller, you can have it detect what the voltage is and if it's within specific ranges 11-14V for example, have it do something. If it's within a different range, 18-28V for example, do something else.

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