I Want to Display Battery Percentage and Battery Life Remaining Time using LCD Display

Other Hardware Product Design
1

I want to make a tea harvester. It uses 4 24v/7500mAh separate batteries that will be combined into one unity.
Here is the battery im going to use (variant: YY 2V):

The battery will be used to run power towards the motor which runs the dynamo.

Problem:
I want to show the user the real-time battery percentage and battery life remaining time (ex: 4 hours 20 Minutes) using an arduino and LCD display.
How should i design it? what are the components necessary for this? and whats the algorithm I need? Im really new to this.

Thankyou.

2

You need to define what you want to show. Battery life and battery charge are two different things. Battery charge is based on the amperes that are put into the battery as it is being charged. The current that can be drawn from that battery is less than the amperes put in at charging time.
Most devices that show a remaining power in a battery are guessing based on the terminal voltage of the battery. Temperature of the battery and the rate of current draw also effect the remaining available current.
So, if you can tell us what you want to measure and how you compute the remaining power in the battery, the rest is quite simple and a very good Arduino project.

1 Like
3

Welcome to the forum. A device like this already exists:

https://a.co/d/d3dgElZ

1 Like
4

Not the question here, but since you mentioned it:

which runs the dynamo

Why?

5

As for what to show, it would be the number (percentage) of power left on battery in use, so as to determine when it must be recharged. In that case by your definition, its battery life. Not only just that, i want it to also show the remaining time of the battery life. As for what to measure, i still have no idea which and how.

6

If you want to do it yourself you will have to count coulombs for any accuracy on Li type batteries.

7

What i know from the design so far, the motor will be used to run the dynamo and the dynamo would run a circular saw

8

That is what you have to research and understand what you are asking for. Are you wanting to pay someone to do this for you?

9

This begs for a schematics or circuit diagram. I suspect that either we have a language and/or technical barrier here, or a very very weird setup.

10

Certainly something seems circular! Could charge the battery from the dynamo....?

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