XW6048 running a 1HP pump? [RE-wrenches]

[Scott Carlson]

My understanding is that the spinning flywheel mass on the generators help
with the starting surges and I do not get a very clear response from Xantrex
as to max amps when the inverter will protect itself and error out. The
breakers can handle the surges with quite a bit left over. By the way, we
have installed a dozen XW's and love the new design, but have had software
problems with the gsm's.

-----Original Message-----
From: Ray Walters [mailto:walters at taosnet.com] 
Sent: Monday, June 09, 2008 11:37 AM
To: RE-wrenches at topica.com
Subject: Re: XW6048 running a 1HP pump? [RE-wrenches]


I've never gotten great surge measurements: the faster the meter the  
higher the surge measurement. Its possible to have a surge with grid  
power that is extremely high, but it is less than a millisecond. Its  
better to consider the whole surge over time, say the first 5  
seconds. THe real question becomes how does the motor surge profile  
fit with the inverter's surge profile? A pump that surges (like you  
said) to 11 times its run watts on grid can still start on a smallish  
generator, because the generator voltage will sag for a few seconds  
on start up, which lowers the current surge of the pump. (its also  
hard on the pump) Outback inverters do roughly the same thing: they  
will max out their current for 5 seconds and allow the voltage to sag.
So you don't actually have to match the surge requirements that you  
might measure on grid.
It gets down to real field experience. I found for instance that the  
SW4024 will out surge an SW5548, even though it shouldn't.
That was due to slight differences in the inverter programming. I'm  
not familiar with XW and how it behaves with an inductive starting load.

Ray Walters


On Jun 9, 2008, at 11:34 AM, Scott Carlson wrote:

>
>
> Depending upon the quality of the motor I have seen surges as high  
> as 11 x
> running amps. Take a starting surge reading with the multi meter if
> possible.
>
>
>
> R. Scott Carlson
>


- - - -
Hosted by Home Power magazine

To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address:
www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Moderator: michael.welch at homepower.com


- - - -
Hosted by Home Power magazine

To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at re-wrenches.org

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------