Re: Problems with battery charger
- --- In Electronics_101@yahoogroups.com, Reese <reeza@...> wrote:
>You mean voltage, it steps down the voltage.
> On 01-Mar-10 06:34, Saurabh Manandhar wrote:
> > Hello all,
> > I recently purchased a 12V lead acid battery charger, and opened it to
> > see the insides. There's this huge transformer which appears to be
> > custom made, a rotary switch to select charging current, couple of
> > fuses and switches, and a Bridge rectifier. I did not see any
> > capacitor in it.
> > What is the effect of not having a capacitor in a charger? How will
> > the battery cope with it?
> The transformer steps the mains current down from whatever it is AC
> to about 12 volts AC. The bridge rectifier takes that as input and
> outputs about 12 vdc. Some older/better chargers will have a switch
> for charging 6 volt batteries too, which are still common on some
> riding lawn mowers and other equipment.
> Car batteries can be kind of funky, and they do wear out - mostly dueFlakes fall off, too. One of the big differences between regular and deep cycle batteries is that deep cycle/deep discharge batteries have much deeper pockets below the plates, so they withstand more flaking before it shorts out a cell.
> to sulfation buildup I think, but also formation of "whiskers" between
> the lead plates, discharging them too far, and extreme hot or cold when
> they don't have a full charge for whatever reason.
> > the charger, it shows about 50V. Any Ideas?Do you have a reference you can give for this?
> 50v? Are you reading the meter correctly? Automotive "12 volts" is
> actually closer to 12.6 volts with charging circuits in the area of
> 13.8 volts - for classic wet-cell lead-acid batteries. Some newer
> systems and battery types actually require more than 14 volts for proper
> charging but the classic lead-acid battery charging circuit should
> never exceed 13.8 volts.
> Sticking one of those less expensive 12.6 volt batteries into one of
> those newer, higher-voltage systems will fry and cause premature failure
> of your classic wet-cell lead-acid battery. Put one of those newer,
> higher-tech batteries in a lower voltage system - the battery will
> not accept and hold a charge properly. So you really have to look at
> what the system is designed for (taking note of whether it has been
> modified), then look at what you are using and make sure everything
> is compatible with everything else.
- On 08-Mar-10 08:24, Andrew Mathison wrote:
> Brushless Alternators!! Great .pdf, easy to understand......I haven't looked at the PDF but if those are the "one-wire" alternators
> How long have they been put into cars?
that are popular in racing circles, they've been available in those
same racing circles for at least 20, maybe 25 years or more. I wasn't
aware they they were being used in any production vehicles.