×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Can I charge and discharge my battery at the same time?

Can I charge and discharge my battery at the same time?

Can I charge and discharge my battery at the same time?

(OP)
Hello,

I am working on a Drone project. I am using a 3 cells Lithium Polymer Battery for the Drone operation.

Now, I have something on the Drone that can generate power - Solar cells. I want to charge my Lithium polymer battery from the solar cells when my Drone is flying.

So, I have a battery in my Drone, my Drone is flying, Solar charges my battery at the same time and I am utilizing that power too.

I want to know about - There is only one cable for charging and discharging in Lithium Polymer Battery. How can I do this?

Can anyone please share their knowledge over this charging technique while the battery is discharging?

Thanks for your help.

RE: Can I charge and discharge my battery at the same time?

You use whatever charger would safely charge the batteries from the solar and you ignore the running aspect completely.

Just so you know the solar capacity of a flyable drone is pathetic with regards to what the drone will draw while running. Your time would be better spent creating a LARGE solar charger that could charge the spare battery while one is flying with another battery.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Can I charge and discharge my battery at the same time?

Your solar cells won't technically be "charging" your batteries, they'll be lessening the load on the batteries by supplying current directly to the load. At the end of the day, does it really matter where currents came and went?

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Can I charge and discharge my battery at the same time?

The only reason that works is that the panel capacity is large enough to provide BOTH motor current and charging current.

btw. student posting is forbidden

Quote:

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Can I charge and discharge my battery at the same time?

(OP)
Ya, I got the point that it does not much matter from where the current came and where it gets utilized.

So, you basically mean that I directly run my motor connecting to the Solar and also to my battery. In this case, at one point, when the battery is discharged and the only source remains active will be solar for motor operation. Moreover, I will not be able to get the judgment that up to what time will my Drone fly. At every point of time, the generation in solar will be different.

Now, if you see in the video, if they have done it by providing the generation directly to the load, their battery would have drained up. It won't get charged. It has clearly been shown that the battery charges when there is enough sunlight. It drains mainly at night time.

That is the reason, I am interested in this one.

(BTW, I am not a Student. Please refrain from any sarcasm and taunt) We all are here for queries, solutions, and support for each other's work. Let's discuss it well.

Thanks for sharing your points. Obliged.

RE: Can I charge and discharge my battery at the same time?

Quote:

their battery would have drained up. It won't get charged.

No, if there is sufficient capacity beyond driving the motors, the batteries will get charged. It's simple math.

If you are not a student, then why is there no EE on this project, since you're asking EE101 questions?

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Can I charge and discharge my battery at the same time?

(OP)
Man, I asked this of course for the case of generating more power through solar than what I am using in operation.

Tell me one thing, I have inserted an image for your reference. According to that, please tell me where should I connect the solar wiring for charging my battery?

Thanks

RE: Can I charge and discharge my battery at the same time?

Ok, that's something you could have led with; and in that case, you are still either charging the battery or not, but under no circumstance are you charging and discharging the battery at the same time.

What does your EE say? You show a napkin drawing of some random things with no specs whatsoever and expect a coherent and functional answer?

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Can I charge and discharge my battery at the same time?

Do keep in mind that just hooking solar cells to LiPO batteries will destroy the batteries and possibly start a fire.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Can I charge and discharge my battery at the same time?

(OP)
@itsmoked - Agree. I can't hook up solar cells directly to the LiPo. That's exactly I just want to know what should be in between solar and a Lipo. Simple.

@IRstuff - Thanks for the information.

RE: Can I charge and discharge my battery at the same time?

OK, Then you find a charge controller to charge the bats from solar and you hook that to the battery as close as you can reasonably do it then you hook that connection to the drive motors and that's it. The motors take what they want and the solar charges with everything it has. Eventually the motors stop and the solar catches up. The key being the solar is run thru a charge controller so it never OVER CHARGES the battery.

Meanwhile the ESC should be smart enough to not UNDER DISCHARGE the batteries.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Can I charge and discharge my battery at the same time?

(OP)
@itsmoked - That's so great from you.

I will get that charge controller. I hope it will work.

Thanks a lot for your help.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close