If you are unsure about your car battery and charger capacity, you can use this diy battery logger in 12V plugin connector to measure it.
For this logger I used STM8S103 module and HM-10 Bluetooth Low Energy module and Android Smartphone as displaying device.
STM8S103 bluepill module:
HM-10 BLE module
Android application screenshot:
Hardware schematic diagram drawn with KiCad:
STM8S103 Firmware was developed with ST Visual Studio with COSMIC C compiler in Windows PC. ST Link V2 as programming /debugging interface.
Kicad 3D images of project hardware:
And actual prototype images:
Project files for KiCad , ST Visual Studio and Android apk to download:
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