DR question [RE-wrenches]

Roy Dyngen roy.dyngen at xantrex.com
Thu Sep 4 09:06:16 PDT 2003


The higher your battery voltage is going into a modified sine wave 
inverter, the higher the peak voltage is on the output.  To compensate 
for this (regulate 120v rms) we narrow the width of the pulse.  Some 
loads may not like either the high peak voltage or the narrow pulse 
width or both.  When it comes to mod sine compatability, there are three 
kinds of loads, 1. Ones that work 2. Ones that don't work and 3. Ones 
that work dependant upon battery voltage.  It sounds like your sensitive 
loads fall under #3.

Roy Dyngen
Christopher Freitas - OutBack Power wrote:
> 
> You should check the RMS voltage and peak AC voltage when the inverter 
> is running with a light and heavy load.  The RMS voltage should be 
> 120VAC +/- 10V under all conditions but the peak voltage should be 
> between 180V and 140V. There are a couple of failure modes that can 
> result in the behavior you are seeing.  
> 
> Most likely it needs a new FET board. Getting someone with a O-scope to 
> check it is probably the best way to check it.  
> 
> Christopher Freitas
> OutBack Power Systems, Inc.
> cfreitas at outbackpower.com  www.outbackpower.com
> Tel 360 435 6030  Arlington WA USA
>  
> jay peltz wrote:
> > 
> > Hi All,
> > 
> > I've got a DR inverter that is doing the following.
> > 
> > When voltage above around 13.8v ( 12v system) the inverter will not run
> > electronic items, it'll do lights and toaster etc, but not the TV, radio
> > etc.
> > 
> > Any ideas?  or is this back to the factory?
> > 
> > thanks,
> > 
> > jay
> > 
> > Peltz Power
> > 
> > 
> > 



Roy Dyngen

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