SMA Combi-Switch questions about UL rating [RE-wrenches]

[Allan Sindelar]

----- Original Message ----- 
From: "Larry Crutcher, Starlight Solar" <larry at starlightsolar.com>
To: <RE-wrenches at topica.com>
Sent: Wednesday, December 12, 2007 6:33 PM
Subject: RE: SMA Combi-Switch questions about UL rating [RE-wrenches]


>
> Yes Steve, but the fact that UL HAS limited this switch to 11.5 amps for
> PV use must be considered. Just because SMA packages it does not
> invalidate the original UL restriction. I can't say it "sounded
> reasonable" to an inspector or insurance company or attorney or judge.
> You get the picture? There is a reason for the limitation.
>
> Are any wrenches using the HU361 for more than 11.5 amps of PV?

Yes, Steve, we are. Here is our logic:
According to the SMA spec sheet

(http://download.sma.de/smaprosa/dateien/4286/Combi-Switch_Flyer_081106.pdf)
,
the Combi-Switch is designed to match well with the SB6000 using four
strings. It is rated for up to 40A, with 4 10A Touch-safe fuseholders. So we
have used it with four strings of ten 160-170W 24V modules.

I think the key is that SMA has had their product, the Combi-Switch, listed
by ETL (not UL) to UL1741. Bingo, end of story, install according to the
manufacturer's instructions. The fact that it's based on an HU361 is
irrelevant; it's now a separate listed product.

At least, that's how we have seen it. Could be wrong, though...

Allan @+E


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