Backfeeding a 200 amp panel with an Outback 3048 [RE-wrenches]

[Ray Walters]

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First, thanks Todd you nailed my sentiments.
Allan, my crazy idea 1 was not using an existing Outback inverter. I was 
hoping (as Todd mentioned) that Outback would create 2 separate AC outs 
(one for loads, and one for grid sell back that could be put on a much 
smaller breaker) This would be UL1741 listed, etc.
I know we can do the tap, just the batteryless grid tie guys are having 
all the fun simply popping in a breaker in an existing load center. Each 
extra step adds to the cost and ultimately kills some projects.

Ray


 Allan Sindelar wrote:

>----- Original Message ----- 
>From: "Ray Walters" <walters at taosnet.com>
>  
>
>>Here's some crazy ideas:
>>Could Outback separate Grid AC IN (for loads and battery charging at
>>60amps) and then have an AC OUT to Grid  that could be sized much
>>smaller just to accomodate the max. array size and therefore get around
>>120% bus limit?
>>1) Is this possible,
>>2) are there any other grid tie/ battery backup inverters with this
>>ability (two AC outs),
>>or 3) once again am I just dreaming?
>>    
>>
>
>The "turd in the punchbowl" of that idea is that AC OUT is for backup loads,
>not grid. The AC IN is the bidirectional feed with the grid. AC OUT has no
>UL 1741 anti-islanding protection. I think it would also be akin to plugging
>the inverter into itself. So 1) no, 2) I don't think so, and 3) yep.
>  
>
>>Crazy Idea 2: could we do this with 2 inverters? For instance, one
>>inverter only setup for sell back, and the other only set for backup
>>loads. (Clunky? yes.)
>>    
>>
>
>Probably, but before I went that way, I'd go with the alternative, a second
>service approach. What we are learning is that this is less formidable than
>it seems on the surface. Use a tap to a 60A fused disconnect, then have at
>it.
>  
>
>>Crazy Idea 3: on the 20% rule:  that's at  240 vac, so if you used  a 40
>>amp double pole breaker you would still be within 120% on a 200 A
>>service, then you could use a transformer to step down to a single
>>inverter for its full pass through capability. (might actually fly)
>>    
>>
>
>I have wondered about this too.
>  
>
>>Feel free to shoot my theories full of holes,
>>    
>>
>
>OK.
>Allan
>
>
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