Electrónica Monitor de bateria "low cost"

[Vladis]

Originalmente publicado por 0tilio

Al contrario, te agradezco la información sobre los ajustes del medidor. Cuando instale el mío, me va a ser de gran utilidad. En realidad sería de gran utilidad para cualquiera que compre uno de ellos, mi recomendación es que la publiques en este hilo, para uso general. Que nos haya llegado sólo a Perseis y a mi, por accidente, es una pena.

Lo siento, pero , a escribir en español , tengo que usar Google Traductor

Hello,

I will describe the problem I had and the solution
to cure it. I hope it will help you.

My problem was about the current setting. Firstly,
with no load, I long press the A/AH button until
the display shows 00.00. This is the zero point
setting. The 4 page leaflet tells me that I should
then set the high current point. It suggests to
use a 30A load (in the case of my 100A shunt). I
only have a multimeter capable of measuring 10A.
Also, when on anchor, I expect a consumption of
between 3A to 8A and a litle more when navigating.
So I assembled 3x 18 ohm (17W) ceramic resistors in
parallel. I wired my multimeter in series with this
resistor load and connected across the battery.
The multimeter showed me 1,98A and the monitor
showed about 1.2A and a bit erratic. I expected that
by adjusting the high current point I would correct
this. So I enter into debug mode (long press SET button)
and then short press SET until the lower display shows
current. Then I press V/W button to increase the
the reading from the 1.2A up to 2.0A (or 1.98A). Then
I save the setting as described in the leaflet (I skip
this step). I looked right but as soon as I switch
off the load, instead of zero, I get 0.8A! This
value is precisely what I added to 1,2A to get 2.0A.

So, I think that this high point setting is no good
as it disturbs the previous zero setting. I contacted
the seller asking for help. He said that a 100A shunt
should not be calibrated with a 2A load. I discussed
the possibility of buying a 50A shunt (which should be
my first choice). He said that the display could be
the same if I got a different shunt. I asked how I
could change the shunt setting. He said that there
is a -FL- setting with different values. -FL-01,
-FL-02, -FL-03, ..., up to -FL-09. He said that my
display was sent to me with the -FL-02 setting that
corresponds to a shunt of 100A. He said that to use the
display with a 50A shunt I should change this setting to
-FL-01. I do not know what shunts should be used
with -FL-03 and so one. So before ordering a new shunt
I tried to change this setting using the information
he sent me.

To enter in the "shunt changing mode" you should disconnect
the power (I am using the power from the battery being
measured). Then I should press and hold the SET button
and connect the power again. If the monitor wakes up
with SET button pressed it enters this mode and bottom
and -FL-02 should appear in the display. To change the
-FL- value I should short press SET several times until
I get the desired value. To save the new value you need
short press A/AH.

So I tried this and change -FL- to 01 to 03 and got
different but still uncorrected current readings. The
interesting thing is that by returning to -FL-02
everything started to work. It is strange since it was
already in -FL-02. So I repeated the current settings.
As before, I set the 00.00 reading with no load and then
tested the monitor with my 1.98A load. It showed me
1.96A and I did not tried to change it as I do not
know the accuracy of my multimeter and I did not
want to disturb the zero settings as hat is important
to distinguish between charging/discharging.

So that is my experience. I hope this could help you.
I kept my 100A shunt as readings are very precise and
stable (not a kind of erratic as before). I do not
know if you need so high currents.

Regards, Vladis