> 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 ?



You need to tell us -

- How much power is drawn. (Watts)

- Discharge duty cycle

    ie brief burst of power occasionally, steady load, ...

- Is charging and discharging simultaneously essential? Why?

    ie if it is always driving the load then charging needs to take 
place

- Wht NOT a SMPS solution - as this is the obvious and best solution.

    ie a SMPS is a voltage level converter at as close to zero loss as 
engineering allows. Anything that is NOT a SMPS is lossy by 
definition., A SMPS may not LOOK like a SMPS.

eg one solution is to use 2 capacitors in series for charging and then 
in parallel for output. These could charge another capacitor at the 
output or you could use two of these in antiphase with overlap for 
discharge. This could be reasonably simple & cheap. There are no 
inductors but it is a SMPS.

You could use my GSR circuit which is lowish cost to do 48-24 
conversion. Depends on power and other factors whether my design is 
suitable.

If you MUST use a 24V input inverter you could use two with inputs in 
series and outputs in parallel. Some engineering required.




            Russell

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