In Progress

Battery Balancer

Create a charge shuttling battery equalizer like this one: [url removed, login to view]

Design it to be modular with each module able to balance from 2 to 5 batteries connected in series. Batteries will be either lithium (2V min to 4V max) or lead acid (11V min to 16V max). Therefore the circuit should be designed to operate under a wide voltage range (2V-16V per battery). The maximum amount of current that must be shuttled is 5A @ 14.5V.

There must be just three modifications to the circuit:

-LEDs to indicate what the system is doing- balancing, balanced.

-Circuit should enter a low power mode once batteries are all within 10mv of each other.

You must select the proper component values, and add the features as listed above and make a PCB schematic with gerber files for PCB production. Also if you decide to make the balancer using a microcontroler instead of entirely from discrete components it must be done with an ATTiny2313, and the source code will be needed. Keep in mind the voltage source for the micro controller are the batteries it is connected to, and voltage readings might be inaccurate without a delta-sigma ADC because of the noisy environment.

This is an open source project with a low budget, so the lowest bidders will have the best chance of winning. This project will bring affordable electric vehicles one step closer to reality. You have most the circuit designed already so it shouldn't take long to implement the other features, select component values and layout the PCB.

When you make your bid, explain the function of R1 in the diagram.

Skills: Electronics

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About the Employer:
( 1 review ) River Forest, United States

Project ID: #483374

Awarded to:


I have checked the circuit in PSpice and it does work balancing is of course slow at 1KHZ SWITCHING. 1) Do you need the actual circuit with current limit,if so from what voltage should it work? 2)Micro controller wil More

$200 USD in 12 days
(3 Reviews)

8 freelancers are bidding on average $181 for this job


Hello, Please see PMB for more details. Yogesh

$250 USD in 30 days
(3 Reviews)

Bidder Comments : Dear Sir, Kindly refer to your PM for more details. Thanks & Regards, SANDS Team.

$150 USD in 7 days
(2 Reviews)

Hello, I am from Argentina and I am studying at my local University to be an Electronic Engineer. I have experience in designing circuits and PCB's for different projects. Please see PM for more details. Thank you.

$100 USD in 8 days
(1 Review)

Charge Shuttling shematic on Lemon-com is wrong for you application. R1 - makes zero offset on gate.

$250 USD in 60 days
(0 Reviews)

Hi, i am expert in this [login to view URL] contact me

$200 USD in 15 days
(0 Reviews)

hi;I can do this for [login to view URL] me.

$150 USD in 5 days
(0 Reviews)

Hi I am expert in electronic circuits design just contact me

$150 USD in 4 days
(0 Reviews)