Unisolar Roofing [RE-wrenches]

[Kent Sheldon]

Hello again Marco. Yes I have UL-1741 listed 600Vdc combiner boxes. They
come in 10 and 12 circuit flavors (very different designs). Call me directly
if you need specific details. They are also in the PV series manuals on our
web page.

Kent Sheldon
Product Manager - Photovoltaic Engineering Group
Xantrex/Trace Technologies Inc.
925 245 5463/925 245 1022 Fax
kentsheldon at tracetec.com  www.xantrex.com


-----Original Message-----
From: mmangelsdorf at hei.com [mailto:mmangelsdorf at hei.com]
Sent: Tuesday, March 20, 2001 12:15 PM
To: RE-wrenches at topica.com
Cc: sburns at hei.com
Subject: RE: Unisolar Roofing [RE-wrenches]


Bill,

Thanks for the heads-up.  No, we didn't take heroic measures due to the
PAUCITY of prior knowledge of needing to do such a thing...Guilty as
charged, your honor!  Since it's a small system, we can check the j-blocks
every so often to see whether invasive moisture is doing dastardly things to
the wire connections.  So, the only solution that you found was to goop the
heck out of the blocks?

On another note, you did hear that Trace Tech. now has high voltage,
UL-listed combiner boxes?  Regarding the SunTie tales of woe, what's your
impression of their recent technical service bulletin?  And the part that
talked about a failure rate of 8 percent of the STs in the field?  Based on
the comments from the wrenches list, one would think that the incidence of
MPPT problems and frequent cut-outs was higher than a little ole 8 out of
100.

aloha,
marco


Marco,

Did you take any heroic measures to seal the junction blocks on the
SunSlates? Your systems are the first that I am aware of in a Tropical
climate. I am very interested in the long-term (first year) reliability of
the product in your climate.

The product had a terrible time passing our field wet resistance test and
the final solution was to silicon over all the junction blocks. This was the
only thing they could do to pass the test. This tells me that unless you
went to that extreme, you are likely to have problems in your climate. Keep
checking your ground-fault protector.

It is good to know that the installation went well after the first couple
installs. It still must be more labor intensive than stand-off mounting, but
many people like the looks.

Bill.


> -----Original Message-----
> From: Jeffrey Wolfe, Global Resources [mailto:global at sover.net]
> Sent: Monday, March 19, 2001 7:27 PM
> To: 'RE-wrenches at topica.com'
> Subject: RE: Unisolar Roofing [RE-wrenches]
>
>
> Hi Marco,
>
> If you have an electrical problem after installation, how do you find it?
> And when you find it, how hard is it to replace the slate? I used to work
> in a roofing company that did some real slate work, and I'm
> having trouble
> envisioning this as being an easy troubleshooting and repair job.
>
> Jeff
>
> Jeffery D. Wolfe, P.E.
> Global Resource Options, LLP
> A Woman-Owned Vermont Limited Liability Partnership
> 4 Kibling Hill Road
> P.O. Box 51
> Strafford, VT 05072
> 802/765-4632
> 802/765-9983 (Fax)
> global at sover.net
> http://www.globalresourceoptions.com
>
>
> ----------
> From: 	mmangelsdorf at hei.com[SMTP:mmangelsdorf at hei.com]
> Reply To: 	RE-wrenches at topica.com
> Sent: 	Monday, March 19, 2001 4:33 PM
> To: 	RE-wrenches at topica.com
> Subject: 	RE: Unisolar Roofing [RE-wrenches]
>
> <<File: ATT00003.htm>>
> Holt,
>
> Having recently installed a Sunslates system here in Hawaii, I
> can tell you
> that they're not difficult to install.  The first system or two will be
> kinda slow.  But once you get the procedure down, they go up fairly
> quickly,
>
> marco
>
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 www.homepower.com

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