Well, thank you for your answer! I guess that I'm responding back to
Vasile Surducan? Cause your book, "Microcontrolere pentru toti" was the
best book in the University and the book that help me started with PIC
programming. I am still writing code with the help of JAL....
I wish to thank again for the good job writing that book!
Back to my problem now! After a few revises I have dropped Lead_acid
battery and switched to LiFePo, just one cell
(http://www.all-battery.com/3.2V12.5AhLiFePO4PrismaticEnergyCell-30251.aspx).
Because Linear Technology as well as Texas Instruments had developed
already LiFePO gas gauges (http://www.ti.com/lit/ds/symlink/bq27501.pdf,
for example) my job just got easier. Because I will need to power my 5vdc
electronics just from a single cell LiFePo the boost converter efficiency
is not so bad especially If I use the converters from Murata
(http://www.farnell.com/datasheets/369793.pdf). Because I will need to
power the 12VDC/1Watt coil of an servo-valve I will use isolated DC-DC
converters from XP POWER. The valve should work for 5 to 15 minutes every
12 to 36 hours...not so bad. The other sensors (4-20mA pressure sensors and
the other two optical level sensors) will be powered from a different
isolated DC-DC converter that will be on for 2 seconds every 5 to 10
minutes, not so bad also.
Just one cell LiFePO (LiIon are not doing it so well at lower temperature,
as -20 Celsius degrees) is easier to monitor and manage. The best solution
for MPPT charger from Solar panel comes from Linear Technology, LT 4000-1.
So, I am pretty much covered in this corner of the problem.
Now, I have the battery gas gauge with I2C communication, 12 bits A/D
converter for the pressure sensor and COG LCD on the same I2C bus. That
wouldn't be so difficult to control.
Any idea about what I2C COG LCD will work better with JAL COG
library? I have selected a few from Farnell, but it's my first time that I
have to send data to a COG LCD ( I have to display a few graphical
parameters of the process)
P.S.: I quite new with forums and threading so it would take a while to
accommodate myself with this. Should I move my thread to JALLIST forum, as
Rob mentioned?
joi, 9 august 2012, 10:02:10 UTC+3, vasile a scris:
>
> Hi Bogdan
> In my opinion, failure predicament for Lead Acid accumulators is not too
> complicated, but I do know nothing about LiFePO cells so I can't
> pronounce... I've designed and manufactured as prototype, about five years
> ago (if I don't wrong) a charger-discharger for NiMH with one channel
> using a simple PIC12F675 and a PC for analyzing data.. I think you have to
> implement two things: a charging algorithm and a discharging algorithm on a
> known load. Both are quite simple. You can also measure dV on dt with load,
> but this might need more than 10 or 12bit AD resolution.
> The biggest problem I've faced over the time since I'm playing with PIC
> micro is not the algorithm itself, but the problems of long time running.
> For such application you'll have to consider deeply how a watchdog should
> help you against bottlenecks.
>
> best wishes,
> Vasile
>
> On Tue, Aug 7, 2012 at 5:56 PM, Bogdan Mihai Octavian <
> [email protected] <javascript:>> wrote:
>
>> Hello everybody! I'm not new into microcontrollers, actually all
>> my projects, personal or those built for the company I'm working for, were
>> built around PIC family. Now I'm working at a project that involves battery
>> management and battery failure predicament. It is a industrial process
>> automation powered from a Solar panel (UPS with MPPT charger and all the
>> other stuff involved). Because it has to work without the Sun, sometimes,
>> from the internal UPS powered from one or two LiFePO cells, I have not
>> decide yet, I have to know the battery condition. The automation it is
>> remotely located and it is visited by the maintenance stuff once a week or
>> in case that something goes wrong (radio communication also implemented). I
>> have founded some hardware solutions, battery gas gauge, provided by Linear
>> Technology or Texas Instruments or Maxim, but those are little too
>> complicated. I was thinking do do that myself and this is where I will
>> need some help.
>> So, does anybody have an idea how to do that? Measure the battery
>> capacity and predict battery failure.....
>>
>> Thanks for your time!
>> (Allocated to read this)
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