[RE-wrenches] Large loads, small service

[Dave Angelini Offgrid Solar]

Hi William,

I did something like this but smaller so I do know it is possible. Along
with Outback I would look at the XW pro that is really made for a micro
grid.
Here is a link.
https://solar.schneider-electric.com/product/conext-xw-pro-na-solar-inverter/

I am testing it here for Schneider and here is a few screen shots of the
monitor Insight 2.


Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridsolar at sti.net
text 209 813 0060

> Colleagues:
>
>
>
> I have an interesting project.  I am working for a family that lives part
> time in a planned community built some years ago.  The HOA owns the 12 KV
> distribution and it is old and undersized.  This client shares a 25 kVA
> transformer with a neighbor.  This calculates out to 50 amps per home at
> 240 VAC.
>
>
>
> The client has more stuff to power than they have power. To make it
> possible to power their loads, I am imagining a pseudo off-grid
> installation. We have grid power, but precious little of it, so we have to
> stand-alone, at least to some degree.
>
>
>
> I am thinking that we can provide a battery inverter system that can be
> programmed to limit the draw from the grid.  All the loads will be
> connected to the AC output of the inverter system.  If the load increases
> over that programmed limit, a smart inverter system should be able to
> synchronize to the grid input and assist with inverted power (like gen
> support on the grid input).  I believe the Radian inverters can do this.
>
>
>
> If occasionally the batteries get low, a generator can run intermittently
> and top off the batteries.
>
>
>
> There is an 8kW grid-tied system on site.  This should be able to help
> power on-site loads or charge the batteries during day-light hours.  I
> will
> specify a contactor to kill the GT feed if the grid goes out and the
> batteries are fully charged.
>
>
>
> We can add another 11 kW of GT solar.  However, I am concerned that we
> might be over-feeding the transformer on sunny days.  The neighbor has
> about 8 kW of GT solar.  If you add all of the GT solar into this one 25
> kVA transformer, you arrive at 27 kVA.  This is too much.  Our additional
> GT solar might be with a Solar Edge HD-Wave SE10000-US.  This inverter has
> an external box that can monitor net back-feed and limit the output of the
> SE inverter to a programmed level.
>
>
>
> Anyway, this is a lot of detail that maybe you don’t need to know.  My
> question is this:  How would you design a system to take 12 kVA from a
> grid
> source and turn it in to 60, or more?
>
>
>
> Any input is appreciated.
>
>
>
> William Miller
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