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 Post subject: A couple of questions
PostPosted: Tue Nov 27, 2012 5:24 pm 
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Re: Bedini fan motor
- I've been finding that I need to provide at minimum 12 volts to keep the system running.
* Components:
- a DC charger rated as 12 vdc , 500 ma output
- a mosfet transister
- 12 volt PC fan
- solid copper wiring between components

The goal is to run the motor using 9 vdc but so far I haven't been able to go below 12 vdc.

Re: Can Nicad batteries be recharged using the motor?
- I have access to several tool batteries that no longer recharge using regular equipment.

Thanks for your input...Albertagold


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 Post subject: Re: A couple of questions
PostPosted: Tue Nov 27, 2012 11:36 pm 
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Yes these fans do not like to run at low voltages, this is because of the high resistance of the coils preventing sufficient current to flow. You can rewind them with slightly thicker wire or operate it as a solid state charger.

Have you ever had the fan stop turning but continue to emit a sound? this is when the fan is acting like a solid state charger. OK you are not getting any mechanical power but you are still oscillating the circuit.

Often you can replace the fan with a transformer or even wind your own transformer.

Another option is you can use Sucahyo's stingo.

you may have to dismantle the bank of batteries to recover them but yes you can charge nicads.

It is usually the case that one or two batteries in the bank have got out of sink with the rest and that is why it wont charge properly.


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 Post subject: Re: A couple of questions
PostPosted: Tue Nov 27, 2012 11:49 pm 
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Thanks bud...Albertagold


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 Post subject: Re: A couple of questions
PostPosted: Sun Dec 09, 2012 3:06 am 
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g'day mbrown;

I finally wore down my 6v deep cell batteries in preparation to reconditioning with me fan motor and encountered a problem.

I have two 6v deep cell batteries for my power system on my tent trailer. I have a solar panel system to charge the batteries when we are camped, and wanted to recondition the batteries using my Bedeni fan motor in preparation for next years camping season.

My motor dies out when I connect the recharge connection to the batteries.

When I first built the motor I had an old 12v car battery that had been stored in a garage somewhere in the last 10yrs. It was in really bad shape but I was able to use the motor to provide some charge.

The one component that had changed since performing the experiment was replacing the AC battery charger as my power source. The older charger had a 12v, 200ma output. The current charger is rated as 12v, 500ma output.

I know that these chargers actually output a higher voltage but I wasn't expecting the problems I'm encountering now. I was expecting better results because I am using a better charger unit.

Questions:
- Would the change in power source cause changes in the operating environment?
- I ran the 6v batteries , connected in series, down to 6v combined. My volt meter shows 2.5v individually. Did I run the batteries too low?
- How low should the batteries be for the reconditioning process.

Thanks for your guidance...Albertagold


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 Post subject: Re: A couple of questions
PostPosted: Sun Dec 09, 2012 3:32 am 
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Yes you have tun the batteries down too low. Never discharge a lead acid battery down below 80% of its voltage, that is if its 12.7, don't go below 10.16. In fact for the best operation I do not discharge below 90% or 11.43V.

The lowest voltage for a 12v starter battery is 11.2V so half that for a 6v starter battery

If they are 6v lead acid the voltage is 5.08v

If they are lead calcium batteries the voltage is a little higher.

You should be able to recover them but it may take a long time. If they are gel batteries they may be permanently damaged.


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