Grid-Tie Inverters with Batteries [RE-wrenches]

Fri Sep 10 17:54:40 PDT 2004

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Frank,

I totally agree, I don't believe that there should be that much sag, 
it's inconsistent with my experiences.  I'd have it checked or simply 
try a different SW+ (or...) to see if the same problems repeated.

I've run a few SW+ here, both pre production and the current 
off-the-floor unit which runs the homestead.  We're fairly brutal; 
lattes at low voltge,with waterpump, washing machine all the while and 
power is pretty stable.  When we tried an Out Back for a while and load 
stability was similar; both just fine for our humble standards.

Perhaps the 'secret' to our sucess is lots of lead.  Behind the battery 
are twelve 2 Vdc tubular plate cells (85T21).  Its 13 years old but 
still delivers gobs of current with reasonable glee.  I often find 
inverter underperformance issues are really caused by too small 
batteries being asked for too much work.  (I'm not suggesting that this 
is the case in Ray's case).

Regards,
Ezra

Frank Fowler wrote:
> 
> Ezra,
> If you are not experiencing voltage sag with your SW+ maybe Ray Walters 
> got 
> a bad SW+ and needs to talk to Xantrex about it!
> ----- Original Message ----- 
> From: "Ezra Auerbach, DragonSun Consulting" <ezra at lasqueti.net>
> To: <RE-wrenches at topica.com>
> Sent: Friday, September 10, 2004 7:26 AM
> Subject: Re: Re: Grid-Tie Inverters with Batteries [RE-wrenches]
> 
> 
> 
> 
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> 
> Hi all,
> 
> I've been running SW inverters for the past decade or so and although 
> off
> grid I have experienced many hard transfers whilst switching betwee
> generator and stand alone.  I've never had any of the computers shut 
> down
> during these transfers but I don't believe the inverter could in anyway 
> be
> called a UPS, if for no other reason that it doesn't isolate the 
> protected
> loads from the vagaries of the quality of utility power.
> 
> By the way my current inverter (no pun intended) is a SW + and we don't
> experience visable sag (flickering, dimming etc.) when starting big 
> loads
> like water pump, skill saw etc.
> 
> Regards,
> 
> Ezra Auerbach
> DragonSun Consulting
> 
> 
> ----- Original Message -----
> From: Todd Cory, Mt. Shasta Energy Services <toddcory at finestplanet.com>
> Sent: Thursday, September 09, 2004 1:36:22 PM
> To: <RE-wrenches at topica.com>
> Subject: Re: Grid-Tie Inverters with Batteries [RE-wrenches]
> 
> >
> >
> > Your free subscription is supported by today's sponsor:
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> >
> > Maybe the Outback guys will remember what the switchover time is with 
> > the
> SW's,
> > since once again xantrex is silent. I'd say if it is less than 10 ms it
> is too
> > slow to be considered a reliable UPS source.
> >
> > Todd
> >
> >
> > "Steve Bell, Sunwize Technologies" wrote:
> >
> > > Hi Joel and everyone,
> > >
> > > I have been running pre-GTI SW4048 and  SW5548 in the SELL mode since
> June
> > > of 2000.  I have not had any problems with loads dropping, that
> includes my
> > > Dell computers.
> > >
> > > Several of my neighbors have pre-GTI SW 5548's in SELL mode, operating
> their
> > > businesses, including a CAD circuit broad design service. NO problems.
> > >
> > > Stelle Telephone Company, our local ISP also operates a pre-GTI SW5548
> in
> > > SELL mode to power the server. NO problems.
> > >
> > > That has been my experience.
> > >
> > > Sincerely,
> > > Steve Bell
> > >
> > > Technical Support
> > > SunWize Technologies
> > > Stelle Office
> >
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