> It is true. It isn't.
> If you use a 240V intermediate stage So you don't use a 240V intermediate stage. You have a single conversion from Vin to Vout. That only gets complicated if you haev to cope with variable conditions, such that you can't say for all situations whether Vin > Vout or Vin < Vout; that might involve a two-stage conversion. > it unlikely to be better than 90% efficient Got any stats for that? Or is that a made-up number? > Add to that that the best efficiency will > be at a high load and in the real world you may well be nearer 60%. LTC's datasheets say something rather different. But I'm sure your data is more accurate than the device manufacturers. > One single conversion from 12V to wanted voltage will almost certainly > be more efficient. ...Which is exactly what I am proposing. But that does not make the system more efficient running from 12V compared to running the same converter from 240V. Vic. -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --------------------------------------------------------------
