Dan,
Yes.. exchanging boards can be the best option to identify where of all
the problem is. Second, if you are able (and your BMS manager has the capacity
to let you identify each sensor board) you can focus on try to find the
appropriate circuitry on the sensor board that belongs to the temperature
sensor. Since you say the communication and voltage readings are ok (and get
sure the boards also continues 'Balancing/equalizing' when required), then the
most probably thing is that the temp. sensor wire/chip may have been
des-soldered or an open/short circuit connection on the PCB may have happened,
some dust, humidity or strange object may have come in contact with it. This
probability increases if the boards are not sealed or are exposed with no
hermetic cover.
I have an elitepowersolutions.com BMS system that has happened similar
things, I re-arranged boards to identify-discard the bad one, re-solder
components and tried to maintain them working. Best way to keep those devices
working securely and long life is to potting/sealing them or putting all those
apart from the battery in a closed/dry/clean area since are delicate boards.
Ing. Marco Gaxiola
Futuro Inteligente - CEO/Director
http://www.futurointeligente.com/en
https://www.facebook.com/FuturoInteligente
My Conversion:
https://www.facebook.com/EvMarch
-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de
[email protected]
Enviado el: miércoles, 31 de julio de 2013 12:34 p.m.
Para: Electric Vehicle Discussion List
Asunto: Re: [EVDL] Lithiumate Lite Temperature Sensor Trouble
Good afternoon Dan, First exchange that board with any other one and see if
the problem follows the board. Al
----- Original Message -----
From: "Danpatgal" <[email protected]>
To: [email protected]
Sent: Tuesday, July 30, 2013 2:17:03 PM
Subject: [EVDL] Lithiumate Lite Temperature Sensor Trouble
I purchased the Lithiumate Lite BMS for a 38 cell 120v nominal pack of 130ah
CALBs that has been running pretty nicely for the past 9 months now. A few
days ago one of the cells showed a faulty -30C temperature (all other cells
showed around 25C, it was a nice day here in Pennsylvania). The voltage
reading and communication on the board seems fine, but that temperature reading
sets a warning and slowly shuts the car down. Annoying.
I've gone through Lithiumate support, and basically they want me to buy a new
board for $33 bucks ($26 + $7 shipping, which is cheaper than the original
price, but still). So far, they don't feel it should be covered by warranty.
First, has anyone else had this problem? Is it possible that I do have some
kind of communication error or connection problem? (I wouldn't think so since
I'm getting a believable voltage reading and communication verification, but I
don't know all the ins and outs.)
Second, I know I would be losing that function, does anyone know if I can
simply "turn off" the temperature control aspect of the Lite BMS? Having the
information, and a warning, is fine/good. But, I'm not very fond of a
temperature reading controlling whether or not my car will go.
Thanks - Dan
-----
Dan Gallagher
http://www.evalbum.com/3854
--
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