[RE-wrenches] AC coupled relay

[Drake Chamberlin]

Hi Dick,

Thanks for the suggestion. I will run the concept by the SMA tech 
people.  I did use the SMA spec sheets in sizing the wiring, but 
maybe opening the relays creates fault current at a voltage that will 
jump the gap.

Drake

At 10:50 PM 6/4/2009, you wrote:
>Hi Drake,
>
>I'm sending you some attachments off list as well.
>They are Sunny Boy Specs from the SMA Installation Manuals,
>which are more complete than those on the SMA data sheets.
>
>Note, the Maximum Output Fault Current for the 3000 & 4000 is 30 amps,
>while Maximum Overcurrent Protection is 30 Amps.
>
>The Maximum Output Fault Current for the 7000 is 57.6 amps, the
>Maximum Overcurrent Protection is 50 amps.
>
>This might be your problem.
>Upsizing the conductors and breakers for the 3000 and 7000 might be a fix.
>SMA tech support could probably shed some light.
>
>Dick
>
>
>
>--- You wrote:
>Hi Dick,
>
>There are three inverters, all Sunny Boys, a 3000, 4000 and a
>7000.  The breakers are QO.  The AC conductor sizes are #8 for the
>7000, #10 for the 4000 and #12 for the 3000.  The breakers are set
>for the NEC ratings of the wire (40 A, 30 A and 20 A.).
>
>I sent some information to you off the list with some attachments.
>
>Drake
>--- end of quote ---
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Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP Certified PV Installer TM
Office - 740-448-7328
Mobile - 740-856-9648  
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