I want to create a simple tester to check the remaining capacity of the supply battery of my motorhome.
It will be done by discharing it via power resistors and measuring the voltage over time. So i will be able to calculate the current taken from the battery, it can be summed up to get the total of the energy taken.
The will be two parameters when the process is stopped: the minimal remaining voltage of the battery or the the amount of amp hours taken out.
The unit will be mainly driven by an arduino nano, it will have a rotary encoder to navigate throw the menu, a Nokia 5110 display.