little help needed with a SB1800 [RE-wrenches]

[Allan Sindelar]

Brian,
Assuming 4.4A Imp at 17.0 Vmp, your array should be producing 8.8A at 204
VDC. Are you getting that?

Also, the minimum operational voltage for the SB1800 is 156VDC. Are you
exceeding that during hot weather? My guess is that you are, as it's hard to
drop below 13.0 Vmp on a 12V module. But a single wiring mistake could drop
you below that threshold during certain conditions, such as hot weather.

BtW, anybody need a working GC1000? How about a dead one?

Allan @+E

----- Original Message ----- 
From: "brian" <brian at paloaltohardware.com>
>
> A customer of mine had a small grid-tied PV system with 16 Siemens SP-75
> and an AEI GC1000.
>
> Anyway... I added 8 more modules, and installed an SMA SB1800.  To avoid
> having to rewire a lot of the existing array, I came up with a somewhat
> odd wiring schematic;  but the voltage string sizing work out fine on
> paper, and even SMA saw no problem with it.  Here is a simple version of
it:
>
> http://www.paloaltohardware.com/temp/
>
> So the problem... is that in 1424 hours of operation, the SB1800 has
> only produced 440 kWH.  The most I've ever seen the thing put out is
> about 990 watts AC.  (the array faces just about due south, no shade at
> all, about 25degree slope.
>
> Any ideas?

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