grounding array/sunny boy [RE-wrenches]

jay peltz jay at asis.com
Sun Jan 13 15:59:34 PST 2002


Hi Kent,

Thanks,

jay

Kent Sheldon wrote:

> Jay, the Sunny Boy 2500U does ground the PV negative and it has three AC
> connections: L1, L2 and PE. The PE connection is not common to either L1
> or L2. And it is not inherently common with the AC building neutral.
> However, it will appear to be common to the AC neutral through the
> system chassis grounds, a ground conductor connected to PE, or any other
> paths to earth/neutral ground. If you isolate the SB2500 from the ground
> grid (remove all AC and DC connections), you will find that L1 and L2
> are not common to PE or the chassis.
>
> The PV negative is grounded inside the inverter through a 1A fuse. This
> is consistent with the requirements of NEC 690. You cannot ground the
> array anywhere else, or you will create a ground fault, causing the fuse
> to clear and the inverter to stop functioning until the other ground is
> removed and the fuse is replaced. So you only need to connect PV + and -
> to the inverter. The inverter will ground the array per NEC 690.
>
> Let me know if you have any further questions, regards.
> ____________________________________________
> Kent Sheldon
> Manager, Industrial Power Systems
> SMA America
> 925 513 8813 Brentwood Office (Primary)
> 530 273 4848 Grass Valley Office
>
> -----Original Message-----
> From: jay peltz [mailto:jay at asis.com]
> Sent: Saturday, January 12, 2002 2:11 PM
> To: RE-wrenches at topica.com
> Subject: grounding array/sunny boy [RE-wrenches]
>
> Hi John,
>
> Question about grounding array neg on the sunnyboy.  Code says that is
> must
> be done.
>
> In testing the unit at Schott, it appears that the neg PV is common with
> AC
> neutral.  If this how its done?
>
> Thanks,
>
> jay
>
> peltz power
>
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