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From: "Peter Gottlieb"
Subject: Re: Boosting output from 120V inverter
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Mon, 28 Oct 2002 13:35:43 GMT
NNTP-Posting-Date: Mon, 28 Oct 2002 08:35:43 EST
Aah, finally a sane response. Be aware also that some designs take their
battery run times and the transformer thermal inertia into consideration
meaning that the long-term output capability is somewhat less than the unit
I saw some nasty burns resulting from people wearing jewelry while working
on UPSes. It was not the voltage that got them, it was the extremely high
available currents from the batteries. In one case a guy had his wedding
band turn orange in an instant and almost lost his finger. So *please!*
Take *all* jewelry off while working on these things.
"Frithiof Andreas Jensen" wrote
in message news:email@example.com...
> "DaveC" wrote in message
> > of course. What are the critical specs I should focus on when looking
> > upgrade?
> I would not bother replacing anything:
> First off: Measure the temperature rise of the heatsink for the FET's, the
> transformer (and any other component running hot) at rated load. This may
> require several hours for the temperature to stabilise!
> Next: Add a fan to blow air through the unit, heatsink & transformer
> be in the airflow. Measure again. Increase the load (very) gradually until
> the temperature rise after several hours is the same as what you had
> the fan.
> Measure the load -> this is what you can eek out of the unit with forced
> cooling. It will not be possible to improve this without major surgery -
> especially to the transformer.
> There may be overcurrent trips, fuses and other stuff preventing you from
> increasing the power. It is also dangerous - there is high voltage, heat
> sinks may not be insulated etc. You know what you are doing rite?
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