On Wed, 07 Sep 2005 01:32:02 GMT, "Vaughn"
wrote:


"Ignoramus25850" wrote in message
. ..

1) a Ferrups FE series UPS with functioning inverter, but blown charging
circuit. 1400 honest VA.

I don't think that Ferrups is very efficient. Hook it up with a light load
and do an input/output power comparison before you commit yourself to this
project. The good thing is that it is sine wave out. In that respect, it is
perfect for running a 'frig.

Vaughn

The Ferrups is perhaps the most innefficient UPS built - but before
the days of switching power supplies, there was nothing that could
provide cleaner, better regulated power.
They did NOT like switch-mode power supplies - they got even more
inefficient when running switch-mode loads.
Today, a good PWM unit can provide power almost as clean, at about 10
times the efficiency (or 1/10 the power overhead).