DR compatible appliances [RE-wrenches]

[hugh piggott]

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from a UK perspective..

Mod sine wave runs most things OK but is not for the fussy customers.

>I understand that some laser printers and photo copiers don't like them. I
>think there is an electronic component (possibly named an "SCR" but I might
>have the wrong initials) that has a problem and will fry and die on mod sine
>power.

SCRs or thyristors (also triacs) are often used for phase control 
applications where the device switches on part way through the cycle. 
This is the case with dimmers for theatre lighting for example.  Non 
sine wave will cause malfunction or damage to such equipment.  Some 
photocopiers, laser printers, washing machines, central heating 
controllers... will not work on mod sine wave.

Motors within oil fired boilers have a shorter than usual life on mod 
sine wave due to high losses in a high ambient temperature.

Where the battery voltage is high and the load is light, the output 
peak of a mod sine wave inverter is above the safe level for some 
electronics (TV sets for instance) and they can be fried.

I do not use mod sine wave around my fax or answering machine if I 
can avoid it - I have a small sine wave inverter for all that stuff 
and the stereo.  otherwise it's buzzzzz background.  Lines on the TV 
screen.
-- 
Hugh

Scoraig, in Scotland.
http://www.scoraigwind.co.uk

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