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

[Pieter Huebner]

It sounds like you are working on an Island near Jones port Maine ( Norton
Island). The site had or has a Bergey 7.5kw XL-R wind turbine, on a tilt
tower which is almost impossible to tilt, a solar array on a stacked log
tower, Kubota generator, flooded cell lead acid batteries and Outback
Inverters. Your assessment of the system is 100% correct, bad workmanship,
and little or no maintenance. The original design was poorly thought out as
well. The poor workmanship was not limited to the energy system, the
electrical infrastructure had issues as well. The original installer was in
way over his head. I have been to that site at the bequest of the original
owner to repair the wind turbine years ago.

                My suggestion is that you evaluate the existing equipment
and infrastructure, and salvage what you can then start with a fresh sheet
of paper. The electrical loads need to be mapped, for example the original
owner had a hot tub at the main house.

The site would lend itself well to a micro grid system. if you like we can
have long discussions about this site and I will be happy to share what I
know about it as well as share my experiences with AC and DC distribution
for off grid sites.

Pieter

 



 

From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of
Foxfire Energy
Sent: Monday, January 10, 2022 5:35 AM
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] Transmitting 15kW 3600ft Off Grid.

 

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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