[RE-wrenches] larger off-grid system inverter preference

[August Goers]

Howie,

We installed a 10 kW grid tied system w/ a 5048 Sunny Island battery backup system right after they came out. Although it's not off grid, the utility power at the site goes down regularly and the Sunny Island has always kicked in flawlessly. We have our system connected to a WebBox to make sure everything stays healthy. 

Overall, I'd recommend the system although it is expensive. By using two 5048s you'll be able to produce 240 v power without an autoformer which is nice. 

Good luck. -August

 August Goers


Luminalt Energy Corporation
4000 Irving Street 
San Francisco, CA 94122


Office:  415.564.7652
Mobile:  415.559.1525
august at luminalt.com
www.luminalt.com





________________________________
From: Howie Michaelson <howie at suncatchervt.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Wednesday, March 4, 2009 9:47:20 PM
Subject: [RE-wrenches]  larger off-grid system inverter preference

Hi all,

Seems large off-grid systems are happening more frequently.  Like most, I
spend a lot of time trying to get my clients to lower their loads wherever
possible, explaining the benefits of doing so from a financial as well as
environmental perspective.

None-the-less, I am currently designing an off-grid system for a primary
residence which will likely have about 10kW solar and either one 48 volt
2,400 amphr string or 2 48 volt 1,800 amphr strings.  The peak load will
be perhaps 8,000 Watts. and consumption of perhaps 25 to 40 kWh/day
(summer to winter).  The remaining load will be made up by generator, and
maybe eventually wind (they wanted to put a vertical access turbine on
their "barn"/garage roof, which I am still actively discouraging, but they
like the look...).  This is the largest off-grid system I have designed to
date.

I'm leaning toward using 2 SI 5048's, but not having used SI's before, I
am wondering about 4 OB VFX3648's (since I'm quite familiar with them).  I
like the sophistication and options (and I believe better charging
efficiency) of the the SI's, but would be interested in feedback from
others experience.

Thanks as always,
Howie
-- 
Howie Michaelson
NABCEP Certified Solar PV Installer™

Sun Catcher, LLC
Renewable Energy Systems Sales and Service
VT Solar & Wind Incentive Program Partner
http://www.SunCatcherVT.com
(cell) 802-272-0004
(home) 802-439-6096




_______________________________________________
List sponsored by Home Power magazine

List Address: RE-wrenches at lists.re-wrenches.org

Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20090305/8eb11949/attachment-0004.html>