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Topic: mobile power recommendations....help (Read 1 time) previous topic - next topic

pingy

Im working on an arduino project that just simple has to be self contained and mobile. I can share the details in anyone cares. the issue at this point is how to power it mobily (battery)

I consider myself a novice, but have a pretty good grasp on battery power. I have changed out the UNO for a mini to help the power draw.

The issue consists of this:

#1 the main sensor of my project draws "<750mw"
#2 I have a 5v voltage regulator feeding it all.

So I need a battery solution that can feed min of 7v to power the voltage regulator.

my first idea was to power it all off a disposible 9v. Knowing the mah rating sucked I tried  anyway and it only lasted about 20 mins or so. LOL.

can anyone help recommend a decent mobile power solution?

TIA

terryking228

Hi, 2 Lithium (LiPoly) cells 3.7 * 2 = 7.4 volts.

MANY sizes and mA-Hr ratings available.

Space? Weight?  How easy to recharge? (Multicell LiPoly Batteries need a balancing charger. If you can pull two cells out and put them in a charger this takes care of that. 

Where are you located?
Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

AA alkalines or NiMh rechargeables (2,000mAh) would run for around 13 hours. 5-6 cells though.

Maybe your sensor does not have to be on all the time- can you turn it on every second or two to save power?

zoomkat

For efficient power regulation, go on ebay and search for UBEC regulators that the RC crowd uses.
Google forum search: Use Google Advanced Search and use Http://forum.arduino.cc/index in the "site or domain:" box.

pingy

terryking228: I am located near Philadelphia PA USA. Could you point me towards a website with some of the batteries you speak of? I have a couple li-pos and have read not to stack them on my own because if it being danergous.
I can you point me towards a 7.2 stacked li-po?


prairiemystic: I could do this as a "last resort" I would perfer to not have a 6AA pack in the project, but I will if need be.


thanks for the REAL help guys. I appreciate it!

winner10920

How mobile is your project? Does it stay still at all? Maybe you could get away with a small solar panel on top that would charge a battery or help lessen the load atleast, assuming your load is about 200ma, this would almost power it entirely or atleast charge a battery
http://www.altestore.com/store/Solar-Panels/Kyocera-14W-12V-Mini-Solar-Panel/p718/

terryking228

Look for a supplier of 18650 LiPo batteries (cells) in USA.. (Shipping is a problem by air)..

I am looking at a nice battery case with 5V 2A switching supply built in that uses 2 series 18650 cells (or 4 in series/parallel).

Here's a photo, but labels in Chinese.. My partner in China is shipping me one... Should be way cool for robots... Has automatic shutdown if over discharged etc etc. 

Probably sell for $15-18 without batteries (About $1.50 each in China, but USA??) 


Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

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