Re: [EVDL] MiniBMS replacement boards?

[Mr. Sharkey via EV]

>> A URL or name for this company would be appreciated.

Try this, although it seems some of the products are discontinued/out-of-stock:

https://evparts.com.au/ev-power-bms.html

>> Let me know once you have a few extra to sell.

This will likely be a fall/winter project, once the year's firewood 
is put up and the outdoor chores cease due to the weather.


Another part of the repower project is going to be to rework a Todd 
Power Source to be a lithium-compatible 36v charger. I'll probably 
run barefoot without a BMS in the short term and carefully balance 
and charge manually until I get something worked out.


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Re: [EVDL] MiniBMS replacement boards?

[Willie via EV]

On 13/08/19 17:30, Mr. Sharkey via EV wrote:
Can't say about the availability of v.3 boards, the whole Clean Power 
Auto inventory and business was sold to an Australian or New Zealand 
company that modified the design, but seem to still be supplying units.


The "original" MiniBMS design ~was~ an open source project that was 
developed on the diyelectriccar forums, and went through a couple of 
evolutions as the users there refined the design. Once it was a 
workable, marketable product, Dimitri took it commercial/private and 
basically stiffed the fellow developers, most of whom weren't at all 
happy about that turn of developments.


V.3 boards chucked the four-section LM239/339 comparitor design and 
went to an Atmel ATTiny45v AVR. Obviously, the code is proprietary, 
but really isn't anything a competent Arduino experimenter couldn't 
replicate.


I'm actually developing a similar BMS based on the v.3 boards, but 
with some significant improvements. These will go on the leaf modules 
I just purchased to repower my ElecTrak tractor. I was going to build 
five units that could monitor 5 modules (total of 10 cells), but the 
PC board layout and code would be up for grabs for other users who 
wanted to build their own. Of course, none of it would be based 
directly on the MiniBMS designs, which I consider to be open source by 
default of the cooperation that went into their development from the 
beginning.


If it's helpful, I have circuit schematics for the "v.2" miniBMS 
modules and the head unit, in case anyone needs to do repairs or 
modifications to them. I've repaired and tested quite a few of these, 
the biggest problem seems to be creepage between the pack potential 
and the alarm loop, and defective solid state relays, which are cheap 
and easy to replace.


I was an early customer of an Australian company that did cell modules 
for LFP cells; they had flat copper foils that needed to come close to 
matching cell terminal spacing.  miniBMS came later and seemed to be a 
knockoff but used more versatile "fly wires" .  I have a box full of 
miniBMS modules of various vintages as well as some Australian ones.  I 
can be dealt with.


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Re: [EVDL] MiniBMS replacement boards?

[Jay Summet via EV]

On 8/13/19 6:30 PM, Mr. Sharkey via EV wrote:
> Can't say about the availability of v.3 boards, the whole Clean Power
> Auto inventory and business was sold to an Australian or New Zealand
> company that modified the design, but seem to still be supplying units.

A URL or name for this company would be appreciated.

> 
> I'm actually developing a similar BMS based on the v.3 boards, but with
> some significant improvements. These will go on the leaf modules I just
> purchased to repower my ElecTrak tractor. I was going to build five
> units that could monitor 5 modules (total of 10 cells), but the PC board
> layout and code would be up for grabs for other users who wanted to
> build their own. Of course, none of it would be based directly on the
> MiniBMS designs, which I consider to be open source by default of the
> cooperation that went into their development from the beginning.
> 

Let me know once you have a few extra to sell.
Thanks,
Jay
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Re: [EVDL] MiniBMS replacement boards?

[Mr. Sharkey via EV]

Can't say about the availability of v.3 boards, the whole Clean Power 
Auto inventory and business was sold to an Australian or New Zealand 
company that modified the design, but seem to still be supplying units.


The "original" MiniBMS design ~was~ an open source project that was 
developed on the diyelectriccar forums, and went through a couple of 
evolutions as the users there refined the design. Once it was a 
workable, marketable product, Dimitri took it commercial/private and 
basically stiffed the fellow developers, most of whom weren't at all 
happy about that turn of developments.


V.3 boards chucked the four-section LM239/339 comparitor design and 
went to an Atmel ATTiny45v AVR. Obviously, the code is proprietary, 
but really isn't anything a competent Arduino experimenter couldn't replicate.


I'm actually developing a similar BMS based on the v.3 boards, but 
with some significant improvements. These will go on the leaf modules 
I just purchased to repower my ElecTrak tractor. I was going to build 
five units that could monitor 5 modules (total of 10 cells), but the 
PC board layout and code would be up for grabs for other users who 
wanted to build their own. Of course, none of it would be based 
directly on the MiniBMS designs, which I consider to be open source 
by default of the cooperation that went into their development from 
the beginning.


If it's helpful, I have circuit schematics for the "v.2" miniBMS 
modules and the head unit, in case anyone needs to do repairs or 
modifications to them. I've repaired and tested quite a few of these, 
the biggest problem seems to be creepage between the pack potential 
and the alarm loop, and defective solid state relays, which are cheap 
and easy to replace.


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[EVDL] MiniBMS replacement boards?

[Jay Summet via EV]

I find myself in need of a few spare MiniBMS boards. Specifically, the
small ones programmed for Leaf modules (4.15 volt shunt, 4.20 volt high
alarm/loop drop).

The ones I have say CleanPowerAutoLLC 2014, v3 MiniBMS on the front and
"RZ-01  94V-0CCS  0215" on the back.

I would also consider any "loop style" individual MiniBMS style boards
that I could put into the loop with them, but would prefer the same model.

Anybody have extra stock they are willing to part with or pointers to a
replacement board?   (They look simple enough that I could manufacture
my own if there was an open source design somewhere)

Thanks,
Jay
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