Low battery charge detector

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caracole
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Low battery charge detector




by caracole » 06/08/08, 15:57

I have a generator set with automatic start which is essentially dedicated to the production of electricity (3x380) to supply a pump submerged at 250m in a well.

Hello,

For the production of "Household" electricity, I have a 400w wind turbine and a 120w 12v solar panel mounted on a sun tracking system. both are connected to a charge regulator box.

I would also like to automatically start my generator (to which a 220 / 12v 45A charger is connected) when my batteries have a critical charge level and stop the group when the load has become acceptable.

(the group is started / stopped by a simple relay contact)

So far I have not found a solution despite all my research on this forum and the net.

Do you have a lead, an idea?

Thank you, Pierre Spain
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by Christophe » 06/08/08, 16:22

Here is the answer I provided in MP:

Well that doesn't seem very difficult to me: it would be necessary to measure the voltage at the terminals of the batteries and below a certain threshold start the group.

No?

The problem is to find this threshold because the specificity of a battery is to have a constant voltage whatever the level of charge.

But I'm sure there are other solutions, we must be able to estimate the charge of a battery more precisely.

Hey all electric scooters have charge indicator I guess it works differently than a simple voltage measurement.


NLC, which is building an electric motorcycle, should be able to respond without any problem I think!
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by the middle » 06/08/08, 16:25

I found that; it seems to me that they talk about = - the same thing
PS, read Chatelot 16 response
http://forums.futura-sciences.com/thread163959.html
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by jonule » 06/08/08, 16:28

Hello,

the generator must be connected to the batteries, then it must be started up by a regulator which can activate the relay of the életrco group: below 11V it starts, above 15V it cuts it off. maybe to be adjusted according to your batteries: how much amperage do you have? how many batteries?
there is a calculation to do I believe not to exceed the charge of your battery amperages, it is found but not more than 10% if I remember correctly?

normally a charge controller does the job, you need to have one for your solar panels and your wind turbine.
that of the panels must make 10A (120W / 12V), insufficient for 45A but maybe can you recover the info of the starting of the load on the relay of the group?
you have to know if the 2 will start: who do you prefer, the signs or the group? because if they put both at the same time, the panels are useless ?! should the group be ordered if the batteries are dirty and the panels have no sun (at night)?

for this it is necessary to study the 12V control circuit which actuates either the panels or the group, to establish a rule.

The photovoltaic panels have a peculiarity: they can be short-circuited or can see their circuit open without damage. This characteristic gave rise to two main methods of controlling the battery charge: the linear series regulator and the linear shunt regulator. As soon as the end of battery charge criteria begin to be met (battery voltage or better yet, its state of charge), the current of the photovoltaic panel is gradually reduced until it short-circuits (shunt) or by opening the electrical circuit (series).

source:
http://www.cipcsp.com/tutorial/regulate ... laire.html

it would be a serial regulator that you need ... a kind of switch in series what ?!
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by Christophe » 06/08/08, 16:30

lejustemilieu wrote:I found that; it seems to me that they talk about = - the same thing
PS, read Chatelot 16 response
http://forums.futura-sciences.com/thread163959.html


Pfff the shame: a big shit popup for pixmania ... the admins of futura science are really crêveurs thirsty for cash ...

ps: I changed the title of the subject
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by the middle » 06/08/08, 16:38

:? Ha good ... knew po; sorry :D
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by jonule » 06/08/08, 16:44

otherwise I have it in stock (among others), the excellent mini eole books:
http://www.nrjrealiste.fr/eole/doc/mont ... 573-22.pdf
http://www.nrjrealiste.fr/eole/doc/mini ... 573-22.pdf

the code is 2018573-22 of course ;-)

the other docs available on my site while mini eole is under construction:
http://www.nrjrealiste.fr/eole/eole_elec.html
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by Christophe » 06/08/08, 16:53

lejustemilieu wrote::? Ha good ... knew po; sorry :D


It's not your fault ... they're the ones who should apologize.
Frankly for a scientific site sponsored by the CNRS and the CEA it's just a "little" pity to have to worry about popups ...

Am I imposing this on you? And yet I have no sponsor ...

End of the parenthesis!
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caracole
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by caracole » 06/08/08, 22:19

As Jonule says, "establish a rule" either the group or the solar panels (I add wind turbine)
So do not mix the brushes.

A rule for example (it is worth what it is worth!)

- if the charge level of my batteries is critical (threshold to be defined) I isolate the rest (PV + Wind) in favor of the charge by the group (which I would have started.) then I stop the group and reestablishes the connection of others (PV + Wind)
It seems a little twisted to me.

What happens if the charger supplied by the group remains connected at the same time as the PV + Wind regulator?

In fact, this is the config I currently have.
The group starts when it needs to supply the submersible pump and stops automatically when the tanks are full. So during the pumping of water the automatic charger is also supplied.

To answer the question how many batteries: 1x200A + 2x100A

For the rest, I am going through the information that you have so kindly posted to me.

Thank you
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caracole
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by caracole » 06/08/08, 22:27

jonule wrote:otherwise I have it in stock (among others), the excellent mini eole books:
http://www.nrjrealiste.fr/eole/doc/mont ... 573-22.pdf
http://www.nrjrealiste.fr/eole/doc/mini ... 573-22.pdf

the code is 2018573-22 of course ;-)

the other docs available on my site while mini eole is under construction:
http://www.nrjrealiste.fr/eole/eole_elec.html


Thank you for keeping the mini eole info in stock : Lol:
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