[RE-wrenches] Grid tied PV to subpanel on detached garage?

[Mark Frye]

1 - What is the AC output rating of the PV inverter?
2 - What is the size of the feeder conductors?
3 - Does the sub panel at the garage have a main breaker of it's own?
4 - Does your AHJ or utility require anAC disconnect or not?

Mark Frye
Berkeley Solar Electric Systems



On 4/11/2012 7:09 AM, Aladdin Solar wrote:
> Wrenches:
> There's probably an obvious answer but please help me think this 
> through. Here's the situation--comes up all the time: The PV array and 
> grid-tied inverter will be located on a detached building (garage or 
> pole barn, etc.). The existing power to the building is a 240V 60A 
> subpanel connected to the main panelboard at the house or main 
> building via buried cable. If we obey buss bar loading and wire 
> sizing, etc, is there any reason why we can't or shouldn't install the 
> small grid tied PV system and tie it into the garage subpanel instead 
> of trenching new lines back to the house and hit the main panel 
> there? One hitch I see is that if we want a PV system AC disconnect 
> near the main meter, the whole garage would end up on that. Have 
> I overlooked an NEC or inverter requirement?
> Thanks for your comments.
> Charlie Pickard
> Aladdin Solar
>
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