On grid w/battery (was non wrenches) [RE-wrenches]

Tue May 28 12:18:09 PDT 2002

Hi all,

As a Canadian I want to chime in here briefly on the question of CSA (not
CTL as is called below).  CSA is the Canadian Standards Association and they
are more-or-less to Canada what UL is to the USA, which is to say an
organization which fulfills two functions.  Those functions are; the
development of standards through stakeholder and expert consultation; and
the operation of independent test facilities which can confirm that products
meet standards which have been developed.

UL and CSA have long standing reciprocal agreements to test and label to
each other's standards and most of you have seen CSA labels on products in
the USA for years.  Look for the small c next to a UL mark, it means that UL
has tested to both UL and relevant CSA standards.

As a proud "Canuck" I like to point out that CSA has a world wide reputation
of excellence and is known for its rigorous standards.  (There are often
tougher requirements for Canadian standards just because up north we have to
be a bit different.)

Hope this clarifies CSA.

Ezra Auerbach

----- Original Message -----
From: "Bill Brooks" <billb at endecon.com>
To: <RE-wrenches at topica.com>
Sent: Monday, May 27, 2002 5:39 PM
Subject: RE: On grid w/battery (was non wrenches) [RE-wrenches]

> Joel and Marco,
>
> With all do respect to my friends at Advanced Energy, the old SW is our
most
> stable inverter on the market. Joel, I think your unit could handle a much
> larger array no problem. It seems that you have fallen into the trap of
> believing that max power tracking has a lot to offer you. While I believe
> there are benefits to MPPT, a properly setup battery-based system will
> harvest 95% or more of what a MPPT controller will do. In fact, the
Advanced
> Energy MPPT or RV Products controllers will save little or nothing when
> dealing with a floated battery (even so stated in RV Products' manual).
Play
> with your system some time and run the inverter up 4 or 5 volts (with the
> C-40 set to max voltage) and you will find your power begins to drop, not>
increase. It does depend on the array, but I would not be so quick to write
> off the use of your unit. From what I remember being at your house, you
did
> not have a huge array. Stick with what works. The biggest issue with the
old
> SW was bad power factor when connected to the grid. I think you already
> adjusted your machine.
>
> Bill.
>
>
> -----Original Message-----
> From: Mangelsdorf, Marco [mailto:mmangelsdorf at hei.com]
> Sent: Monday, May 27, 2002 5:13 PM
> To: RE-wrenches at topica.com
> Subject: RE: On grid w/battery (was non wrenches) [RE-wrenches]
>
>
> Joel and others,
>
> At the risk of sounding like a syncophant salesman for our friends at
> Advanced Energy, Inc. in NH, their Multi-Mode battery-based 5 kW
> inverter was designed to do exactly what the SW can't do: max power
> point track.  Their inverter also uses no grid power at night to keep
> the batteries floated.  I've been closely monitoring a number of
> Multi-Modes in the field here in the tropics and the reports have been
> very positive in terms of performance.
>
> On another point: what's the latest with Xantrex getting UL listing for
> the SW 4.2 with the GTI?   It's my understanding that the SW/GTI has
> been approved by CTL in oh Canada but has yet to get official UL
> approval.  Does anybody know anything otherwise?  Has anyone had any
> difficulty getting their new SW/GTI assembly approved by the AHJ or
> local utility?
>
> aloha,
> marco
> ProVision Technologies, Inc.
> Hilo, Hawai'i
> www.provisiontechnologies.com
>
> >From Joel Davidson:
>
> The point is our battery bank has just sat there 35,000 hours keeping us
> off the
> PV array max power point and buying a float charge at night from the
> grid for
> less than 24 hours of relatively non-essential backup power.
>
> Of course, I'd have to change inverters unless Xantrex figures out how
> to get the SW4048 to max power point track when on the grid and function
> as a
> UPS in stand-alone mode during grid outages.
>
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