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Old 09-19-2010, 07:35 PM   #11 (permalink)
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DC-Bus

Thought I'd pass this along - Power line DC-BUS communication applications...
Look on the bottom left under "DC-BUS in Renewal Energy"

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Old 09-19-2010, 09:30 PM   #12 (permalink)
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It isn't a BMS, but lately, I have been using a simple battery monitor a friend designed.



It's an LED bar graph that shows the voltage of each of four batteries. (This one is a double, it will do up to eight 12V batteries.)

Using it, I was able to spot that one battery always started dropping voltage faster than the others. I replaced it and the car seems to be performing better since then.
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Old 09-22-2010, 12:40 PM   #13 (permalink)
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Quote:
Originally Posted by bennelson View Post
It isn't a BMS, but lately, I have been using a simple battery monitor a friend designed.
Ben,

Any more info or documentation that you can share on that battery monitor ?

-Mark
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Old 09-22-2010, 12:52 PM   #14 (permalink)
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I'll post some more info on that project soon.

I haven't actually been one to do the soldering on one of those yet, but I have some video about it that I need to edit and post.
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Old 09-27-2010, 07:38 AM   #15 (permalink)
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Any idea when this is going to be available for sale?

Is there anything I can do to help with its design to speed it along?

I'm currently planning a crude system that will use zener diodes and lightbulbs to bleed off excess charge current, but it will do nothing for discharge. No BMS will kill AGMs in a few thousand miles.
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Old 09-27-2010, 11:37 AM   #16 (permalink)
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I think we are in the testing stage right now for these battery monitors.

Next time I see Tom, I will ask how close he thinks we are to being able to sell a version of it.

He's an EE, so he knows what he's doing for making them. It's more a matter of features on it and getting some EV miles of testing on them.
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Old 10-15-2010, 04:35 PM   #17 (permalink)
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What do you guys think about this BMS:

minibms.mybigcommerceDOTcom/pages/Product-Support.html

Prices are here:

cleanpowerautoDOTcom/MiniBMS.html

minibms.mybigcommerceDOTcom
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Last edited by 1-ev.com; 10-18-2010 at 04:11 AM.. Reason: add info
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Old 10-25-2010, 10:40 PM   #18 (permalink)
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Paul,

Just a thought on CAN... OBD-II is a CAN system if I remember correctly. I'm not sure what all information is there other than stuff related to the old engine, but if most converters of newer (OBD-II) cars keep the ECU, you can pull speed sensor value and probably 12v battery voltage from there at least, maybe more. Just something to think about.
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Old 03-18-2011, 04:34 AM   #19 (permalink)
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those mini bms seem pretty expensive if you're planning a very big pack... i don't know a whole lot about bms yet but i would think that a scalable circuit could be designed for maybe a dollar or two per cell, rather than 12 dollars per cell plus master boards at 230 dollars per 16 cells. again, i might be wrong, or maybe i'm missing something.
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Old 03-18-2011, 08:56 AM   #20 (permalink)
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Quote:
Originally Posted by isaac_alaska View Post
those mini bms seem pretty expensive if you're planning a very big pack... i don't know a whole lot about bms yet but i would think that a scalable circuit could be designed for maybe a dollar or two per cell, rather than 12 dollars per cell plus master boards at 230 dollars per 16 cells. again, i might be wrong, or maybe i'm missing something.
The MiniBMS started as an open source project. This is the link to the development of MiniBMS: MiniBMS Project

Regards,

-Mark

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