Trying to recreate the standard operation of most modern rechargeable devices like portable speakers, in that they run from DC power when plugged in, while also charging the battery. Then switch to battery power when no power is connected.
My project is a variation of this idea How to make a super bright LED light panel (for video work etc) - YouTube but with Arduino controlling the LED brightness.
I have these Zippy 3S 11.1V packs and also these protection boards http://www.ebay.com.au/itm/3S-8A-Li-ion-Lithium-Battery-Protection-PCB-BMS-Board-DC-11-1V-T-5016A5-/251997272784?pt=LH_DefaultDomain_15&hash=item3aac353ad0
My plan was to hook them up like this but I'm not sure If I completely understand how those boards are meant to be used. For one thing, the massive gauge difference between the battery terminals and the balance terminal on the battery packs makes me think they are not designed to output current through the balance cable.
Am I even close to being on the right track here or will I be forced to buy expensive charger and remove batteries every time for charging?
Specs for the protection boards.
Model: T-5016A5
Rated voltage: 11.1V
Charge voltage: DC: 15V CC / CV
Maximum continuous discharge: 8A
Overcharge detection voltage: 4.35 ± 0.025V
Over-discharge detection voltage: 2.7 ± 0.080V
Overcurrent detection current: 12 ± 1A
Resistance: ≤40mΩ
Working temperature:
Are you asking if the ebay BMS can replace a LiPo charger?
I'm pretty sure the answer is no.
I believe the cells can not be directly connected as they are in your 3S pack. I think the three individual cells need to be connected through the BMS. I don't think you can't just add the BMS on top of a pack which has already been built.
Ok thanks,
Sorry I'm pretty new to Lipo's and definitely not an RC guy who these pack seemed designed for.
It just seems like such a common use scenario for lipo batteries in a project to be charging when plugged in, and discharging when not.
I can see this product looks like what I want, but is designed for a single 3.7V cell.
Does anyone know of something similar to handle 3S?
Or perhaps a DIY circuit I can build?
Thanks.
Don't know if you still are looking for a solution to your battery management system. I have found a solution, using this:
https://www.google.com/aclk?sa=L&ai=DChcSEwjUhrOSw7XOAhWCCtMKHQjNA-UYABAO&sig=AOD64_2FZWE9aSBk3ZituyZc-I8sEzMrwA&adurl&ctype=5&q&ved=0ahUKEwiNlLCSw7XOAhXEAsAKHbfUDnsQpysIEA
it takes 3 18650s in series and has over and under - voltage protection. i tested the circuit, and it works with a charging voltage of between 12 and 20 volts. I tried to give it 32 volts (from a power supply i has lying around) and that did not work at all.
I am currently testing the under-voltage protection of the circuit by letting the batteries power a car lamp until they are low.. i am pretty confident it will work.
I plan to use 9 batteries total, 3p3s with the above circuit and powering a boom box with it. i have a 3.5a 20v power supply to charge it with.
good luck on your search friend.
