[RE-wrenches] GT w/ BB

[Dave Angelini Offgrid Solar]

  Hey Michael,

The screenshot from the June Webinar is max for split phase. I have not 
done one yet but Eric Bentsen says the Back-up control switch that 
Schneider sells works well and no imbalance. I would say call him but he 
is in Vegas at the RE+ tradeshow.

  Definitely not outdoor rated! Surprised that someone would do that with 
a big system. I would stay DC coupled always for Offgrid but Eric says 
it is now supported with the sensors in the BCS. Nice to have Insight 
Cloud showing the whole system.

Does anyone ever specify the right loads for Offgrid anymore? Not 
directed at you BTW.

Good Luck!

Dave Angelini Offgrid Solar
"we go where powerlines don't"
    [1]https://offgridsolar1.com/ [2]  [1]
e-mail  offgridsolar at sti.net
text 209 813 0060

On 2023-09-18 10:12 am, Michael Morningstar via RE-wrenches wrote:

> I've been asked to build a back up system for a grid connected estate. 
> We haven't done many of these and I thought it best to ask those who 
> have some questions before I go about reinventing the wheel.
> 
> Here's the existing infrastructure.
> 1) 400amp Metered Main Distribution Panel with six 200amp feeders to 
> various sub-panels on the property
> 2) 400amp ATS and 100kw Kohler rapid response generator
> 3) 20kw ground mount array with (2) SE Inverters located at the array. 
> Feeder from array is 1,000 ft to Service. Six years old and wiring is 
> janky.
> 4) Data logging for the last year shows peak demands of almost 40kw. 
> This could increase as several of formerly vacant  guest residences 
> could be occupied.
> 
> My go to is almost always Schneider, however in this instance when I 
> looked into a quad stack, or more It seems like some type of controller 
> is needed to prevent imbalanced current passing through the relays 
> during transfer. That left me a bit concerned. Has anyone successfully 
> stacked 4 or more XWPROs?
> 
> Then there is the matter of AC or DC coupling? I really want no part in 
> having anything to do with SE. The inverters are already looking pretty 
> weathered taking the brunt of the prevailing winds and storms (they are 
> mounted to one of the ground mount poles). Seems like a great waste to 
> pull out the 4/0 feeders and replace strings. My other hesitancy with 
> AC coupling is that we would lose PV monitoring and control.
> 
> I've also considered Sol Ark 15's, like three of them. We've got some 
> SA systems under are belt now and the only thing I can say that I like 
> is the speed of installation and the 200amp pass through. Other than 
> that, they leave me uninspired. One very large system continues to have 
> glitches that SA just shrugs their shoulders about. If we were to do 
> three 15's, what's the preferred combining method? All that I can come 
> up with is a custom 400a panelboard w/ three 200a breakers.
> 
> Price is not a consideration for this project. The new owners of this 
> property (which is plagued with outages) have tasked me with building 
> something that is ultra reliable and good take over in a situation 
> where the grid is no longer available.
> 
> Any suggestions or tips are appreciated.
> 
> Michael
> 
> --
> 
> Michael Morningstar
> 
> Morningstar Electric
> 
> PO Box 1494
> 
> Mount Shasta, CA 96067
> 
> 530-921-0560
> 
> mjmorningstar at gmail.com
> 
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Links:
------
[1] http://members.sti.net/offgridsolar/
[2] https://offgridsolar1.com/
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