[EVDL] Mini BMS schematic

[Mark Hanson via EV]

Hi.  Mine is at www.evdl.org/lib/mh 

Have a renewable energy day
Mark in Roanoke
Www.reevadiy.org

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[EVDL] Mini bms

[Steve Clunn via EV]

When the mini BMS company stop selling they're Mini BMXs I started
exploring some of the ones sold on eBay for bicycles packs. I came across
one that I was pretty impressed with. It does a small amount of balancing
but can show all the battery voltages on your cell phone with download of
the app. The BMS board is not designed to run a relay but it will control a
small amount of amperage. I use a small power supply and a relay set up 2
run a contactor for the charger and a buzzer when in drive mode. I also
found that if you tap on one of the windows showing the individual cell
voltage that it will data log the cell voltage if left hooks to the
Bluetooth connection. You can adjust all parameters with a computer with
Windows 8 but not Windows 10. I've spent a lot of time trying to figure out
how it works and there is not a lot of information provided by the
manufacturer. There's more information on our website
www.greenshedconversions.com   Steve Clunn Greensconventions
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Re: [EVDL] mini bms cellmods

[Jay Summet via EV]

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On 04/19/2015 11:51 PM, ken wrote:
 The ones I use start Shunting at 3.65 and HVC at 4.00 .
 

Dimitri from Clean Power Auto recommended against lowering the default
settings as it would leave capacity on the table (make it unable to
charge to absolute max), and that I could always set my charger to a
lower setting for daily charging as long as I balanced the pack initially.

Also, I imagine it's a bit more work to sell (and support) boards with
different custom settings for each customer.

Jay
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[EVDL] mini bms cellmods

[ken via EV]

 The ones I use start Shunting at 3.65 and HVC at 4.00 .

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Re: [EVDL] Mini BMS problems / solution.

[Steve Clunn]

I just finished installing 66- 60ah Calb batteries in a Mini Cooper.
When I tested the car,  I got the alarm right away from the mini BM
headboard. No lights on the mini BMS modules,  so no low battery
cells, but the alarm sounded every time the gas pedal was pushed.  I
started trouble shooting,  taking out different parts of the equation.
When I cut out the front battery pack I did not get any alarm.
Thinking that it must be something in the front pack I spent more time
than I care to admit doing things to the front pack,  trying to get
the alarm to stop.  At one point I ran wires from the back to the
front coming out the front window and still got an alarm,  even when I
didn't have the modulus hooked up to the wire and had the wires
connected together.   It turned out  that the wires going forward had
to pass over the DC DC converter and because of the tight  position
were laying right on the DC to DC converter.

Rerouting the wires  away from the DC to DC converter solve the
problem.  The mini BMS alarm wires work like a large set of Christmas
tree lights. If anyone goes out it breaks the circuit and sets off the
alarm. The output from the headboard to the chain of BMS battery
boards is about 100 microamps .  Interesting this happened on April
fools day.  I remember a few years back someone  posting on April
fools day joke about a new screen that was so fine it would strip the
hydrogen atoms off of the water molecules so as to make hydrogen to
run fuel cells from water

-- 
Steve Clunn
Merging the best of the past with
the best of the future.
www.Greenshedconversions.com
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Re: [EVDL] Mini BMS Calibration

[Cruisin]

Re-calibrate after a known full charge and change to a more realistic reserve
of 10%. Drive the car normally and enjoy. If not enough range, increase
battery AH as 100ah is too small anyway.



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