A big reel of cable and known load copper by its nature a resistor who
needs a zener diode that=92s just wasteful..

Option 2
Diodes in series designed to drop 24v that=92s about 28 in series assuming
0.85v / diode when in full conduction also a bit wasteful.

Option 3
Fet coil diode and a 3843 (switch mode) Efficient (usually)

Option 4
Get a 48v inverter and keep the charger

Option 5
Take half the turns of the charge transformer and change the divider chain

Option 6
48v motor and a 24v dynamo =


There's 6 for a starters...

Steve

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Thomas C. Sefranek
Sent: 12 June 2007 22:04
To: 'Microcontroller discussion list - Public.'
Subject: RE: [EE] Battery Voltage Divider 48v > 24v

A BIG resistor and a BIG shunt regulator.  (Zener)
Designed to Drop 24 volts in the resistor.

  *
  |  __O    Thomas C. Sefranek  WA1RHP@ARRL.NET
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41MHz PL74.4
 =

ARRL Instructor, Technical Specialist, VE Contact.
http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
rlistas
Sent: Tuesday, June 12, 2007 4:47 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Battery Voltage Divider 48v > 24v

Hi Herbert, =


Ok, good point.

What I=B4m trying to say is:

"without the option to change the charger circuit designed for
48V, does any simple circuit (not a SMPS) exist that I could
use to get 24V from this 4 series connected batteries, in such
a manner that all 4 batteries are used simultanously?

Thanks  =


Rubens



At 16:08 12/6/2007, you wrote:
>On Tue, 2007-06-12 at 14:20 -0300, rlistas wrote:
>> Hi
>> =

>> I have a big problem here and need some help.
>> =

>> I have a battery bank with 4 series connected batteries (4x12v) giving
48V
>> connected to a charging system designed for 48v (a current source).
>> =

>> I need to connect this bank to a 24v DC AC inversor.
>> =

>> How is the optimal way (if it is possible) do solve this problem ?
>> =

>> We have to consider the fact that the batteries must be
>> discharged simultaneously, because they are charged
>> simultanously (in series).
>> =

>> Any suggestion will be welcome.
>
>Since you don't specify what "optimal" means: In my mind the "optimal"
>solution is to either replace the current source with one designed to
>charge a 24V bank, or replace the inverter with a 48V input inverter.
>
>TTYL
>
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