How to power pieces of my project.

Projects General Guidance
1

I am looking for some help in how to power my project. I am making a cell phone charging station. My first iteration is a little tupperware 4 drawer container. Each drawer will have a usb plug in it. I am using the ones that plug into a cigarette lighter that converts 12v to 5v (see attached picture). They say they provide 1A at 5V. I am powering the system off a 12V deep cycle battery and solar panel. I live part time in the jungle and there is limited electricity provided government generators. I want the system to be able to check the voltage of the 12v battery (that is on the left side of the breadboard in the schematic. I am using 100k and 10k resistors to create a voltage divider. I have a 4 relay board that will trigger each drawer. I am using an Arduino Nano (just bought it, although I am not sure what version, see attached pic). I used fritzig to make a schematic. I only did two buttons and two relays and two LEDs. I was thinking of using one of the the cigarette lighter 12V to 5V converters to power the board and thinking I could power the relays with a second one. My relay board is a FKECL CP6-4D. I am not sure if the 5V 1A usb would be enough for it. Any other suggestions and improvements are welcomed. I live in S. America and parts are not the easiest to get. In a couple of days I will be traveling back into the jungle for a week or so but I will respond ASAP. Thanks in advance.

2

I can't really figure what is the purpose of the Arduino?

Do you want it to switch off power to the phone chargers if the battery voltage is too low?

But, if so, I don't understand why you need 4 relays?

And if you are trying to manage with a limited source of energy I suspect your project contains a lot of energy wastage points - including the Nano itself and the relays.

It would help if you describe the overall objective of the project.

...R

3

The overall project will have a coin collector attached to the system. The arduino will check the voltage of the battery, will check if a coin has been deposited, depending on which button is pushed it will send voltage to that drawer for 4 hours. So it will be a self contained phone charging station. I am sure it will not be the most efficient nor am I trying to make money off it. I am just trying to come up with something that the people can use and will work. Thanks