SunDanzer Question [RE-wrenches]

[John Raynes]

<x-flowed>

It seems as if the Sundanzers do some type of automatic switcheroo at 
about 17 volts, because the current consumption drops about in half in 
24 volt mode.  I don't know if they actually cutout between 17 and 22.8 
though, I suppose someone at Sundanzer should be able to say.

I'd be concerned because of the general admonition not to be banging 
compressors on and off in normal use.  You could add a timer function 
so that the circuit wouldn't reclose for 5-10 mintues, but it's 
starting to sound too complicated already...

If Sundanzer would provide assurance about safe operation at low 
voltage end of the 24 volt range, I'd just let it run.  If you pursue 
that approach, I'd be curious to hear what they say.

John Raynes
RE Solar
Torrey, UT


At 11:23 AM 9/7/2007 -0500, you wrote:

It seems to me like this approach overkill.  The Sundanzer is 12 or 24 volts
with no user modification required to select which voltage.

We've got one at our shop that's run from off our demo/test system.  We
frequently change this system from 12 to 24 back to 12 volts and the
Sundanzer just keeps plugging along.

I just assumed the compressor has an input voltage of ~11-~30 volts.  But
maybe I'm all wet.

Best,
Travis Creswell
Ozark Energy Services


-----Original Message-----
From: David Palumbo, Independent Power & Light [mailto:ipl at sover.net] 
Sent: Friday, September 07, 2007 10:40 AM
To: RE-wrenches at topica.com
Subject: RE: SunDanzer Question [RE-wrenches]


Allan,
I have used a similar circuit for water pumps and washing machines with good
results.
- Dave

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com]
Sent: Thursday, September 06, 2007 3:35 PM
To: New wrenches posting
Subject: SunDanzer Question [RE-wrenches]



Wrenches:
We have a longstanding customer with a 24V offgrid home system. He is adding
a Sundanzer 5.8 cubic foot 24V DC chest freezer to his home. We will locate
it in a cool north porch for minimal power consumption. The porch is
directly above a pit containing his 24V Booster Pump and pressure tank, and
I'd like to use the same DC circuit, rather than running new conduit and
wires.

My plan is to use a 24V coil relay in the pump pit. Normally closed contacts
would send power to the freezer, since it has both lower draw and longer
runtime. The pressure switch would activate the relay coil to disconnect
power to the freezer when there is a call for water. It looks like the
freezer draws about 1.6-3.2A, and the pump 8-10A. I don't remember the
conductor size, but it was sufficient for the application when installed.

Anyone tried this? Any problems with this approach? Is it overkill?
Sundanzer specs indicate minimum 22.8 V for the 24V models, but I don't know
if this is a hard number.

Thanks for any responses.

Allan at PosE


- - - -
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 sbcglobal.net

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
--^----------------------------------------------------------------




</x-flowed>