Hi guys, I searched the forum and the web but couldn't find an answer.
Wouldn't it be possible to plug two XR stock chargers and connect them in parallel with an XLR Splitter Cable (1 female to 2 male XLR) so as to have one female XLR that outputs 6A at 63V ?
Wouldn't that be the same as what the Chibattery Fast charger provides ?
Just as something to use every now and then when a fast charge is really required, not on a regular basis.
@hanahsdax Cool, good to know. Did you or your neighbour notice any degradation of the battery performance or any problems on the board(s) following this dual charging ?
Charging up to 90% is a good idea. Then I could finish the charge with only one charger and therefore if balancing did occur it would not be a problem.
All of that means I would need to monitor the charging but as I said I would only use that when I really need a fast charge and I'm by the board. For instance when I'm going places specifically to ride, I don't want to wait 3h + for my CBXR to charge between morning ride and afternoon ride.
Ok. Thanks for all you replies.
I'm surprised no one ever tried it. I might investigate a bit more and do some tests.
@Lia I was wondering about the constant voltage threshold indeed. As for balancing I guess if I just stopped the charge when full then balancing would not occur. The idea really is to do a fast charge pretty much sitting by the onewheel while it charges.
Also anyone knows how I can correct the title of the topic and replace the "to" by "two" ?
@TheBoardGarage Hi Mario, any thoughts on this subject ?
@theboardgarage Thanks for the reply.
It's reassuring to see it's been done before and that it worked.
I just have one last question.
I have made a splitter and I've added in it a little Volt Amp display so I can read the values beeing fed to the onewheel.
With only one XR charger plugged into the splitter I get around 63V which is to be expected but 3.3A which is more than I was expecting.
I have not tried to plug in the second charger in the splitter yet as I was worried that it might charge at 6.6A which is quite a bit more than the 6A the Chi charger gives.
Do I need to add a current limiter or will the BMS limit the charging current itself to 6A ?
I've done a bit more experimenting.
I made a splitter (dual male xlr to single female xlr) with a little lcd display giving the voltage and current passing through.
On a stock XR at about 80% battery, one stock XR charger gives about 3 A then this value slowly decreases as the charge goes on (we're already in the constant voltage phase). Plugging both XR stock chargers does not change anything the amps remain at around 3 A and the decrease occurs. So far so good.
On a CBXR at about 20-40% battery (the battery gauge is a bit flaky and it depends if you base your reading on the app or the CBXR charts) one XR charger gives 3.3 A and both XR chargers together give 6.6 A.
This was both read on the display (6.6 A) and on the Owie app (6.8 A), so we can assume it's relatively accurate.
See pictures attached.
I only kept this plugged in for a few minutes at 6.6 A as I was worried that some components might not like having such a strong current for too long.
My CBXR is a 15s2p with cells M35A . These have a given maximum charging current of 1.7A.
https://www.molicel.com/wp-content/uploads/INR18650M35A-V2-80096.pdf
I am a bit out of my depth here but if I understand correctly, during the constant current charging phase if 6.6 A of charging current is applied, it is divided equally amongst each of the cells of each serie and therefore each cells only receive 0.44 A (6.6 / 15) right ?
Which does not seem that much and would be well within specs.
So the only thing that could suffer from the 6.6 A current would be the BMS. Anyone as any idea how the current flows through the BMS and if there are some "weak" components in it ?