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

100A MPPT Solar Charger Controller, EEEkit Solar Panel Regulator Charge Controller Auto Focus Tracking, High Charging Efficiency, Dual USB, MCU Control, Build-in Timer(Blue)

10A/20A/30A Manual PWM Solar Charge Controller - China Solar Controller, Solar Charge Controller

ROHS MPPT Solar Charge Controller Manufacturer

40 Amp Solar Charge Controller – BougeRV

PWM Solar Charge Controller 10A by Wanderer

User manual Projecta SC245 (English - 12 pages)

Solar Charge Controller Manual Pwm Instructions Intelligent Two Usb Dc 5v 2a Lead Acid Battery Charger 2 Usb 5v/2a Max 1500w 50v , Find Complete

Solar Charge Controller Manual Pwm Instructions Intelligent Two Usb Dc 5v 2a Lead Acid Battery Charger 2 Usb 5v/2a Max 1500w 50v - Buy 20a Pwm Solar

CE RoHS Solar Battery Charge Controller 30A Sr-HP2430 for Solar Power System - China 20A CE RoHS Solar Charge Controller, 20A Manual PWM Solar Charge Controller

Manual PWM Price Solar Charge Controller China Supplier

Ls1024 Ls2024 en Manual, PDF, Fuse (Electrical)