http://www.ladwpsolarnews.com/workshops
Peter,
on your gripe in the orientation thread i thought you might like this link.
LADW just finished a series of angry frustration venting sessions where they
were work-shopping ideas for how to put Los Angeles solar installers out of
business with
Focused Energy can get some bifacials.
Date: Tue, 6 Oct 2009 17:02:31 -0700
From: Peter Parrish peter.parr...@calsolareng.com
To: 'RE-wrenches' re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] orientation data
Message-ID: e1mvjzi-0004gc...@pop-borzoi.atl.sa.earthlink.net
Allan,
First, depending on the age of that Sunfrost, it might be OK to use on
either a 12V or 24V system directly. The older ones are 12V only, but
I'm not sure when the changeover occurred. An email to Sunfrost should
give you that data.
For over 15 years we've used a Vanner Voltmaster.
I advise not to center tap the 24v battery, with a Voltmaster or any other
half to half balancing unit. My own Voltmaster failed to maintain the two
halves at a sufficiently close state of charge. It's hard enough to keep the
cells working well as team without adding possible additional imbalance
Allan,
We used a Solar Converters DC/DC converter on a similar system (48v)
at a vacation cabin. The owner turns off the breaker in the power
shed to reduce phantom loads from the converter when he's gone, and
the frig is left turned off. We ran 48v to the frig and installed
the
Hi Folks..we have an upcoming Sunny Island/Sunny Boy AC Coupled system
installation.We have mostly done Outback and Xantrex battery based
systems...and like the available supporting DC load centers with main
breakers and other DC load and charging breakers..
What are folks using
Hello Kirpal,
Walt Ratterman here. I can respond to at least the first part.
In Burundi, we used three 5 KW Sunny Island 5048's in a three phase
configuration.
For all of the DC and AC breakers, wireways, etc., etc., we used the Outback
Flexware equipment.
We put the DC on the
Hi, two questions:
(1) Doesn't each Sunny Island unit already include a DC disconnect breaker
for the connection to battery?
(2) Aren't those big DC breakers in the Outback boxes restricted for
vertical installation only?
I've got my own 3 phase Sunny Island thing coming up (maybe) so I look
Hello Mick,
The way I understand it, the DC switch on the SI is really an on off switch
and not a circuit breaker. SMA recommends that the system has other
overcurrent protection. The main value of the DC switch that I could see is
that it provides an easier re-set point. (There are some
Walt:
Fascinating collection of photographs. Your projects are ambitious and far
flung.
I brought over a hardware item from the broadcast industry: Lacing
strips: http://www.middleatlantic.com/rackac/cablem/cablem.htm#lbars
I have a few photos on our web site of the
implementation:
two issues, if a breaker is mounted vertical the on position is NEC supposed to
be up.
But the bigger issue is DC breakers have arc chutes, these rely on the arc
gases rising and breaking over the arc chutes. (some of them have magnets to
force the arc over the chutes.) The interrupting
Walter, Kirpal,
Nice install in Burundi! I'm wondering about the battery cables - how did
you connect the battery lugs on the 2/0 (?) cable to the SI's? Is this an
SMA approved adaptation? I like the use of the FW1000's.
We just finished a retrofit of a legacy off-grid double dual stack Trace
Howie,
There was no adaptation. The SI landing pads are designed to take the
crimped lug that we installed on the battery cable from the inverter
breakers.
Thanks,
Walt
-Original Message-
From: Howie Michaelson [mailto:ho...@suncatchervt.com]
Sent: Wednesday, October 07, 2009 7:59
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