[RE-wrenches] Transmitting 15kW 3600ft Off Grid.

[Ray]

That's a long enough run that you really need to weigh the cost of a 
separate system.  I'm not seeing the advantages of keeping a single 
system for the whole island.

Ray Walters
Remote Solar
303 505-8760

On 1/10/22 9:43 AM, Chris Mason wrote:
> I would use a 6,600V single phase outdoor pad mounted transformer pair 
> and deep bury a single #2 direct burial cable. Easy and quick.
>
> On Mon, Jan 10, 2022 at 7:34 AM Foxfire Energy 
> <dan at foxfire-energy.com> wrote:
>
>     Hi Guys, Got a good one for you.. We were tasked to refurbish a
>     Stand Alone (aka Off Grid) power system on a 100 acre private
>     resort island off the New England coast a few years back.. The
>     system has a 12kW(AC)/ 48VDC power center (@120/240VAC) with a
>     10kW Bergey wind turbine, 3kW of Solar and a 12kW Diesel
>     Generator.. It currently powers two main lodges and 10 private
>     cabins.. The system was never installed properly and had
>     significant damage when we got there (no system ground, evidence
>     of several lightening strikes, open/corroded connections, and poor
>     workmanship in general)
>     The new owners want to build a third lodge at the other end of the
>     island.. Some 3600ft away, and want to feed full power from the
>     existing system to the new lodge.. Thing is, the new owner is
>     pretty brainy (keeps me on my toes).. My first thought was to bump
>     the 120/240VAC up to 480VAC and send it on like 4/0AL and back
>     down to 120/240VAC at the new lodge (we've done it before).. The
>     new owner wants to launder the AC to DC and back for
>     transmission.. Says DC for transmission is the new Cats Pajamas
>     because of the efficiency.. News to me.. Anyone have experience
>     with DC for transmission? Again.. I'm shooting for 15kW (including
>     25% for continuous duty), 3600ft, 600V wire (but could go with a
>     different wire) and a line loss under 5%. TIA db
>
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> -- 
> Chris Mason
> Solar systems designer
> Generac Generators Industrial technician
>
> Comet Systems Ltd DBA Comet Solar
> Anguilla Cell  264.235.5670
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