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Old 03-18-2011, 03:18 PM   #21 (permalink)
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thanks mark. i'm gonna research as much as i can about that open source minibms. it looks to be a LOT more along the lines of what i need. something where the entire bms can be built into a large pcb, and then have just a single wire running to each battery (since they'll all be connected in series) plus one additional wire to pick up the remaining cell at the end of the string.

right now we're using 60 conductor 300v rated ribbon cable, and it's pretty ideal for connecting things that need a lot of wires. the connectors are especially easy to install: you just squeeze the end on with a pair of pliers (or by hand if you have super gorilla hands) in maybe 3 minutes and you'r set

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Old 03-31-2011, 04:27 PM   #22 (permalink)
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Quote:
Originally Posted by MPaulHolmes View Post
I worked on the software for the dsPIC30F4011 much of today. I've re-written it like 3-4 times, and it's getting better. I still haven't tested it though. The circuit is just sitting there in the garage, ready to go. Maybe in a couple days. I'm allowing so much slop in the transmission of the morse code from the attinys to the dspics that the transmissions should survive an EM pulse from a nuclear warhead. Speaking of nuclear war, one of my favorite movies is "The Day After". It's the bomb! hahaha.

Also, the CAN code is close to being ready. The 1000amp Sync. Rect. controller is going to use a dspic with CAN, so it will be easy to interface with the bms.
What's your "Morse Code" and how is it carried from one place to another?
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Old 04-01-2011, 11:32 AM   #23 (permalink)
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One unit of time high (call it 'dit') means send a zero. One unit of time low means ready for next 0 or 1. 3 units of time high means send 1.

The "unit of time" can be any amount you want. it's all good.
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Old 07-06-2011, 02:05 AM   #24 (permalink)
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Quote:
Originally Posted by MPaulHolmes View Post
One unit of time high (call it 'dit') means send a zero. One unit of time low means ready for next 0 or 1. 3 units of time high means send 1.

The "unit of time" can be any amount you want. it's all good.
Am I to understand that your both rewriting morse code, and at the same time that you can code what kind of example you want? Why not just use binary at a set bit depth?

Say 8 bits that gives you a value range of 0-254. Since a single battery is unlikely to need a value range that high and we may want a single decimal place we can use the maximum value of 0.0 - 25.4.

Would this not be easier to code? I could fiddle with it if you would like.

Will your BMS control the charger or simply talk to it? I think it makes more sense regardless of battery type to have any on board charging system use the BMS to tell it when to do stuff. This is even best when the BMS also controls or influences the inverter/speed controller. It can detect shore power and disengage the traction drive. Even beep at you when you hit the gas or turn on the ignition.

The BMS if designed like this can also be used for solar/wind power as well.


While we are on the subject, is this design of your static yet... =)
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Old 07-06-2011, 06:02 PM   #25 (permalink)
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I have had a look at Paul's design and its not for me. So I have designed yet another BMS (YABS?)
But rather than hijack Paul's thread, I'll go start a new one entirely and those interested can comment.

Low Cost BMS
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Last edited by harlequin2; 07-07-2011 at 09:26 PM..
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Old 07-06-2011, 06:53 PM   #26 (permalink)
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Originally Posted by Simy View Post
Am I to understand that your both rewriting morse code, and at the same time that you can code what kind of example you want? Why not just use binary at a set bit depth?

Say 8 bits that gives you a value range of 0-254. Since a single battery is unlikely to need a value range that high and we may want a single decimal place we can use the maximum value of 0.0 - 25.4.

Would this not be easier to code? I could fiddle with it if you would like.

Will your BMS control the charger or simply talk to it? I think it makes more sense regardless of battery type to have any on board charging system use the BMS to tell it when to do stuff. This is even best when the BMS also controls or influences the inverter/speed controller. It can detect shore power and disengage the traction drive. Even beep at you when you hit the gas or turn on the ignition.

The BMS if designed like this can also be used for solar/wind power as well.


While we are on the subject, is this design of your static yet... =)
See Low Cost BMS

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