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Tool Talk Discussion Forum

Re: Century Model 87151 Battery Charger

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Author  [Modern View]

06-02-2013 17:03:08

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I believe that one uses a SCR to regulate the charging rate to the various settings. If so, it needs that and it"s associated control circuit to function or things are gonna get ugly.

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George Marsh

06-02-2013 17:52:42

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 Re: Century Model 87151 Battery Charger in reply to Bob, 06-02-2013 17:03:08  
If he can't get a brain box, then buys a new charger or perhaps uses a dimmer switch to control the output of charger. Apparently, the full out circuit must by-pass the brain box.

A while back, I showed how I controlled the output of a 12v charger with a dimmer. That way a person could charge a 6 or 8v battery with a 12v charger. I don't have a 6 or 8v battery, but the volt meter showed I could control the output voltage from zero to over 12v. It worked, but hummed a lot.

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06-02-2013 18:11:29

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 Re: Century Model 87151 Battery Charger in reply to George Marsh, 06-02-2013 17:52:42  
the dimmer switch thing only works on fairly low current (maybe 20 amp max) straight transformer types of chargers without electronic controls.

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George Marsh

06-02-2013 20:02:02

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 Re: Century Model 87151 Battery Charger in reply to IH2444, 06-02-2013 18:11:29  
It's still possible a 600w dimmer switch will work in place of the brain box, with the exception it won't shut off automatically. Think about this. If the input voltage is 120v and 5 amps = 600 watts. The output of a charger is 12v, in theory, the output amps should be 50 amps. That's just theory. Reality, a transformer isn't 100%, so there will be less than 50 amps out.

SOOO, I think a dimmer will work. What is there to loose? The charger is junk. A dimmer is a few bucks. I say by-pass the brain box with a dimmer and then tell me it doesn't work.


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06-03-2013 18:15:23

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 Re: Century Model 87151 Battery Charger in reply to George Marsh, 06-02-2013 20:02:02  
The dimmer will not work.

The "brain box" is on the output side of the transformer not the input side.

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36 coupe

06-03-2013 18:04:38

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 Re: Century Model 87151 Battery Charger in reply to George Marsh, 06-02-2013 20:02:02  
The dimmer puts out a chopped voltage that will eat a transformer.A look at the output voltage on a scope will prove it.Dimmers are designed to work into resistive loads not transformers.

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