Charge controller manual?

I recently got a cheap PWM charge controller to be able to charge my batteries individually to do some tests and charge my car battery if i need to. The controller says Max PV voltage 50v and Max PV power 390W. In the manual it has a note "12v battery with 18v solar panel. 24v battery with 36v

40A MPPT OLED Display Solar Charge Controller Regulator 12V/24V Autoswitch

Nominal system voltage, 12V/24V/36V/48V Auto Recognition, Rated Battery Current, 60A, Rated Load Current, 6A, Max Solar Input Voltage, 160V DC (25°C),

60A 12V 24V 36V 48V MPPT Solar Charge Controller

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【Dual USB 60A MPPT Solar Charge Controller】 Using innovative MPPT technology high tracking efficiency up to 99%;Please refer to the information if you

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KLD1220 controller

Solar Charge Controller CMP12（5A-12A）User's Manual : Free Download, Borrow, and Streaming : Internet Archive

Powmr Mppt 60a Lcd Display Solar Charge Controller 12v 24v 36v 48v Auto Solar Panel Battery Charge Regulator For Max190vdc Input - Solar Controllers - AliExpress

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12V 24V 10/20/30A/40A/60A Solar Panel Battery Regulator Charge Controllers – Envistia Mall