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
[email protected]
www.luminalt.com
________________________________
From: Howie Michaelson <[email protected]>
To: RE-wrenches <[email protected]>
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
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