Inverter Power Ratings [RE-wrenches]

[jberdner at sma-america.com]

Todd:

I think you can see the continuous power rating in the manual.
It is a power versus time graph but...there are two details to double
check.

1) What ambient temperature does the graph assume (20C ?) and what is
the derate for higher temperatures.
2) Is the graph for stand alone use or for grid tied use.
   I think the efficiency is different in the two modes so I would
expect they power rating to be different as well.

Best Regards,

John Berdner

-----Original Message-----
From: Todd Cory, Mt. Shasta Energy Services [mailto:toddcory at jps.net] 
Sent: Tuesday, April 30, 2002 7:34 AM
To: RE-wrenches at topica.com
Cc: Pagan MacKay
Subject: Re: Inverter Power Ratings [RE-wrenches]


So here is my question.... what IS the safe continuous level to operate
the SW4024 at in a grid-tie application? Would one derate say 10%?

I somehow thought 4 kW was the "continuous power handling level", and
that the surge capacity was intermittent. That if over loaded, the
inverter would automatically drop back to protect itself, or shut down
in an error condition from excessive loading.

Most motors have information them detailing duty cycle if not 100%. I
would expect other electrical/electronic devices that are not rated at
100% would have some kind of information on them indicating their
service derating.

Todd



> >Hi Don and all.
> >
> >Been gone and just returned to this thread.
> >
> >I agree with Don and kent.  Makes no sense to push the inverter, any 
> >inverter. I mean I wouldn't recommend someone to run a SW4024 at 4kw 
> >for all day.
> >
> >Peace,
> >jay

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