[RE-wrenches] SMA E-Panel and Inverter OCPD

[Carl Adams]

boB,

I see and understand the functionality of the input-output bypass switch
(breakers).  The other breaker labeled "Sunny Boy(s) Input"  in the drawing
and labeled "Grid Tie Inverter" on the unit, seems to provide a single OCPD
for the combined input of the two inverters.  The SB 5000 has a maximum
output current of 22A and the SB3000 a 15A max output.  Seems we should
have output breakers on each inverter circuit prior to connection to the
SMA E-panel busbar.

It seems there are a couple of options.
1) A small AC combiner panel with a suitably sized  breaker protecting each
inverter and #6 conductors run from the  AC combiner to the SunnyBoy input
bus bar in the E-panel.  The 60A OCPD ("grid Tie Inverter") in the E-panel
protecting this circuit.
2) Two suitably sized AC breakers installed on the extra DIN rail on the
right hand side of the E-panel and output of these breakers feeding the
busbar.
3) Run #6 conductors from the E-Panel Sunny Boy Input Busbars back to each
inverter output circuit, and let the 60A "Sunny Boy(s) Input" breaker
provide the OCPD for both inverters.  Not sure this option passes muster
with a single OCPD protecting two devices.

I hope that clarifies the question.

Thanks
Carl

On Mon, Sep 16, 2013 at 4:32 PM, boB at midnitesolar.com
<boB at midnitesolar.com>wrote:

>
> Carl, there are actually 2 (two) Sunny Island AC load output breakers.
> One set is in the AC input-output bypass switch and the other are
> separate breakers so you can turn off the inverter output.
>
> The Sunny Boy outputs also go through a 2-pole circuit breaker.
>
> What OCPD are you referring to ?
>
> boB
>
>
>
>
> On 9/16/2013 12:31 PM, Carl Adams wrote:
>
> Hello Wrenches,
>
>  We are installing our first Midnite Solar E-panel for SMA.  The epanel
> has a bus bar for landing the inverter  output circuits.  The attached
> diagram from Midnite does not include any OCPD in the circuit, but it seems
> to me these will be required .  We'll be installing an SMA SB3000TL and
> SB5000TL.  Have any of you installed this SMA E-Panel configuration before
> and if so how did you handle this piece of it?
>
>  Thanks in Advance
> Carl Adams
> SunRock Solar
>
>
>
>
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