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Posted by RamRod Sword of Baal on April 24, 2008, 7:05 pm
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>
>
> I have a particular set up for powering my computers. We are on mains
> power (Australia 240 volts 50 cycles) but I have a system for running the
> computers, it has 4 x 6 volt T105 batteries (24 volt ) and a 2500 watt
> inverter.
>
> There are as many as 9 computers can be put on line, but in actual fact
> normally it would only be 2 or possibly 3, depending what is happening in
> the house. I cannot see where we would ever have as many as 5 running at
> one time.
>
> The system allows for running a TV and fridge in case of a power failure.
>
> The power for the batteries comes from a simple 40 amp 24 volt charger, it
> is a transformer and rectifier. It is a solidly built unit that I had made
> for the job.
>
> I also had a 25 amp electronic charger but it has failed and needs repair
> or replacement.
>
> These large chargers are quite expensive here in Australia, for instance a
> 24 volt 25 amp charger can run up above $1000.00.
>
> The inverter is a sinewave job and cost $2500.00 so any idea of throwing
> away what I have and replacing it is not on.
>
>
>
> Now comes the problem. The battery charger being only a simple battery
> charger need the battery voltage to drop quite a bit before you can get a
> large current out of it. I want to maintain around 27 volts in the
> batteries and have the charger put in what ever the inverter is dragging
> out, so if the inverter is using say 20 amps, I need to put in 20 amps,
> plus a small maintenace charge for the batteries and maintain the 27 volts
> in the batteries, so I am not constantly draining and recharging the
> batteries thus reducing their life.
>
> I have seen one of these devices in the past, but unfortunately lost the
> link.
>
> It is an electronic 'box of tricks' rated around 40 amps that you can put
> is a DC voltage and get out a constant dc voltage.
>
> As I can increase the DC voltage from my current simple battery charger to
> up over 40 volts if I so desire, I am looking at buying something that
> would give me a constant or near constant 27 volts, and rated at 40 amps
> output to maintain the batteries at full charge. Of course the 'box of
> tricks' needs to modulate the current to maintain the 27 volts in the
> system between 0 and 40 amps
>
> I understand it might not be able to hold it at exactly 27 volts, but it
> would want it to be somewhere near that number.
>
> At the moment I seem to be having the problem of either pulling power out
> of the batteries or over charging them, depending on what setting I use on
> the battery charger.
>
> Has anyone seen such a thing (DC Voltage stabilizer), and knows where I
> can get one, or has a circuit diagram for something like this?
>
> I have not been able to find anything using Google.
I should have made the point that I want to use the DC power from my current
simple battery charger to feed into a DC to DC voltage stabilizer.
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