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

[Larry Crutcher, Starlight Solar]

Steve Johnson wrote:
> 
> I think the clue is where you note the SMA combiner is not wired 
> according to any figure on this data sheet!
> 
> The 10 amp fuses can carry 6.4 amps of current (6.4 x 1.56=10a)
> 6.4 x 4 strings  = 25.6
> Fusible safety switches may carry 80 percent of nameplate current
> rating (continuous use). -from SQ D sheet-
> 32 amps x 0.8 is 25.6
> 
> The Combi-switch manual lists "Max Continuous Output Current 32 A DC"
> 
> I don't know if that's right but it sounds reasonably good.  Or you 
> could say they have two 30 amp knife blades in parallel (60 amps) that 
> are rated for 40 amps DC.  (This is the simplistic view!)
> 
> Steve Johnson
> LightWave Solar Electric
> Nashville, Tennessee

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?

Larry Crutcher
Starlight Solar
Yuma, AZ
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