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'[EE]:[PIC]: Monitor battery string volts with PIC?'
2000\08\10@142403 by Ed Boggs

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> Hello everyone, long time reader, first time questioneer.
> I was wondering the best way to monitor the voltage of individual
> cells (100-250) on a 300 to 600 volt floating battery string. Using small
> multi-AD PIC's powered externally using opto 485/422 link?. The usual
> technique is to run wire individually (fused) from each cell to a remotely
> placed AD system. very expensive and messy. Thanks in advance


>How about using multi-channel I2C A/D convertors, one per x cells, then
>connect those direct (or via PICs to convert to RS232/424/485/CAN etc. if
>your environment is noisy) to your monitoring point. A recent thread on here
>mentioned using I2C over remarkably long distances at lower speeds, which
>would probably be fine for this.

>Serial 8 channel A/D convertors are readily available at reasonable prices
f>rom a number of manufacturers, so around 30 or so of those would do the
>trick for you. With a bit of jiggling you could probably do the whole thing
>with just one PIC if you don't need a fast refresh rate.

The nominal cell voltage is 2.25 volts x 240 cells. Refresh rate is low.
8-bit resoultion is fine. We also have strings of 45 12 volt ups batterys
nominal 13.5 volts. Can I power the PIC or the serial A/D converters from the
battery string itself or should I run an external power bus. I am leaning
towards an isolated external power bus with an optoisolated link hooking up
all the PIC A/D conterters to a master processor. These batterys are for
large  UPS systems. Thanks for all the replys so far. Sorry about my
incorrect subject header. I will figure out the syntax.
                                                     ED

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2000\08\10@142830 by Andrew Kunz

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>Sorry about my incorrect subject header. I will figure out the syntax.

Don't you be sorry.  WE'RE sorry that James makes us do this.

Andy

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2000\08\10@144219 by Dan Michaels

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Andy Kunz wrote:
>>Sorry about my incorrect subject header. I will figure out the syntax.
>
>Don't you be sorry.  WE'RE sorry that James makes us do this.
>

Seconded. Shall we vote now?

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2000\08\10@161156 by Olin Lathrop

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>Don't you be sorry.  WE'RE sorry that James makes us do this.

Speak for yourself!  I for one am glad there is filtering of time wasting
babble.  While I think the syntax is a bit cumbersome, it's well worth the
result it achieves.  It's too bad the list server can't automatically
discard all the messages that aren't properly tagged.

I don't understand why we get 5 - 10 (haven't counted, just seems that way)
posts per day that have no subject tag.  Are these people too dumb to read
the rules or too arrogant to care?


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spam_OUTolinTakeThisOuTspamcognivis.com, http://www.cognivis.com

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