Hi Russel;

>- How much power is drawn. (Watts)

Peak Power of the inverter is 1000W.

>- Discharge duty cycle
>    ie brief burst of power occasionally, steady load, ...

Steady Loads. =



>- Is charging and discharging simultaneously essential? Why?
>    ie if it is always driving the load then charging needs to take =

>place

Yes. Because is a off-grid system, conected to solar panels/wind generator
to recharge the batteries.


>- 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.

Initially I thought it was possible, only using diodes, to make
what you suggested in the above with capacitors but with the batteries
and without switching. It=B4s possible, but only if I do not charge and dis=
charge
simultaneously.

Do you have any link for this kind of circuit ? It=B4s viable for =

this level of power ? Anyway, I=B4m interested to see it.

>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.

Sorry, what is this GSR circuit ? Could you give more details ?


>If you MUST use a 24V input inverter you could use two with inputs in =

>series and outputs in parallel. Some engineering required.
>

If think it=B4s not an easy task to parallel two AC power supplies because
the AC phase mismatch. Or am I wrong ?


Thanks very much for the help Russel.

Rubens






>            Russell
>
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