Posts by — Lydia Polzer

Mayor Johnson – eco geekBuilding Services Journal reports lobby group London First saying decentralised energy generation could reduce the UK capital’s carbon emissions by 3.5 million tonnes pa.

In its latest report, researched by respected structural engineers Buro Happold, London First called for a collaboration between central government, the Mayor of London and his agencies, energy companies, developers and boroughs towards decentralising a quarter of London’s energy supplies.

Locally placed combined heat and power plants linked to housing estates, as well as surrounding local amenities and hospitals would, the report claims, make for higher levels of energy efficiency as opposed to centralised power. (more…)

We could all be living like Bob LARAMIE, Wyo. (AP) – When Bob McGovern bought a plot of land west of Laramie, he probably didn’t know the extent to which that land would set him on a course toward self-sufficiency and energy independence. It didn’t take long, however, for ideas to begin brewing in his mind on how to build a house that was “off the grid.”

The nearest utilities to the property are far enough way that McGovern estimates that it would have cost him $25,000 to get service to his house. Instead of forking out that money, he spent time researching everything from small-scale wind turbines to solar panels, battery technology and energy efficiency. (more…)

Cambridge DJ duo

Cambridge radio show CUR Green carried a one hour interview with Off-Grid editor Nick Rosen. The award winning station CUR 1350 is hosting the show for the next month – so listen while you can.

Its the second half of the first hour of the show presented by Salman Chaudhry and Tobias Bown. And the first half of the second hour. (more…)

Buy a house, get a community

Abundance Ecovillage is a small, friendly community in Iowa, with 14 houses either built or under construction. It relies on a wind turbine and solar panels for electricity and is self-sufficient for water. Its part of a burgeoning trend all over America.

The infrastructure was already in place when Stacey Hurlin and her husband bought their house and moved in. There was just one catch: a $35,000 one-time fee that covered utility maintenance for her 950-square-foot, $115,000 home and various community projects. (more…)

Let there be light

The Development Marketplace team of the World Bank today launched a competition, to reward project ideas that address the various off-grid lighting needs of Sub-Saharan Africa, including alternative distribution models, new clean lighting technology, stronger production chains, and improvement of the policy environment.

Ten to 20 winners will receive grant funding up to $200,000.

The competition is open to a broad range of innovators around the world, including private businesses, nongovernmental organizations, universities, government entities, and individuals. (more…)

KR sells off-grid to Arnie

In a feature on companies that will disrupt existing businesses, Business 2.0 cites power company Bloom Energy

THE DISRUPTION: Energy generators in homes and businesses

THE DISRUPTED: Electric utilities

Making electricity in central power plants is so 20th century,says the report. K.R. Sridhar has a better idea: Create energy on the spot, right where it’s consumed. His startup, Bloom Energy (formerly known as Ion America), is developing a fuel cell that could kick-start the distributed-energy industry. (more…)

Phone freak.

Unexpectedly cut off from phone, fax and Internet, this writer discovers he rather liked it. By Matthew Mallon

In February 27, 1975, a fire of unknown origin struck one of New York Telephone’s major switching stations in lower Manhattan, “causing the worst service disaster ever suffered by a single Bell operating company,” according to a company history. Until service was restored, 170,000 area phones went dead, and some 300,000 New Yorkers were “deprived of a vital electronic part of the urban environment,” as reported by Time magazine later that spring. (more…)

Off-grid is not second best.

The New York Times estimates a total of two billion worldwide are living without mains power, water or phone. The implication is that this tragedy needs to be dealt with. But many of those people are happy as they are. And they could have access to power and water without it being brought to their doors by big-budget make-work schemes. (more…)

Being off the power grid generally also means that we are off the
telephone
grid. In my way of thinking, lack of phone is a much more serious
problem
because power is easier to fix than phone. Today let’s take a look at
the
various options that exist for getting off-grid phone service.

Normally (that means city) phone service runs along wires buried in the
ground
or suspended on telephone poles. These wires will typically enter your
property
in a skinny green metal box where a lineman can then run one or more
telephone
lines to a connector on the side of your house. The green box is put on
your
property by the developer before the house is built.

Off-grid is a different matter. There is no developer to pay to have
the phone
company install wiring, so if you want wires, you will have to foot the
bill
yourself. Prices vary from one region to the next but in all cases the
cost
will be impressive. It will not benefit the phone company to run wire
for a
single customer, so you must pay for the project yourself.

In some places you can run the wire yourself and the phone company will
even
give you the wire. They only need to specify the depth of wire
placement and
will need to inspect

the work before the wire is covered. You will need to get permission
and have
easements established along the path that the wire will follow and a
power
trencher is a virtual necessity so you will need to rent or purchase
equipment
to do the job. Crossing a black-top road will require a professional
help and
more permissions than I would care to undertake. A county gravel road
might be
as bad. A private gravel road is less of a technical issue, but
permissions
from owners must still be secured. Any overhead run on poles is
likewise out of
the question for the “do-it-yourselfer” for primarily liability and
maintenance
reasons. If all of this sounds like a lot of work and a bunch or money,
you’re
right on both counts. Which is the reason there are some alternatives.

The first alternative most people will consider is cellular telephone
service.
Since cellular radio does not depend on wires to the customer’s site,
there is
no big up-front investment in bringing an off-grid customer on line.
The
standard rate plans, with fairly high costs for each minute of use,
have given
way to plans that might even be affordable as the primary phone service
to a
rural property.

Naturally, there are drawbacks to cellular. In some cases the special
rate plan
may only apply to digital calls. Calls that originate in an (older)
analog only
service area may not be

covered. Since the digital system is only in metropolitan areas, it is
likely
that your service will be analog. This could impact the cost
effectiveness of
such a plan very badly!

And a cell phone is just a phone. You can forget about surfing the web.
Oh yes,
there are cellular modems, but read the not so very fine print
carefully. On a
very good day you might get a 4,800 bits per second connection speed on
a
cellular modem as compared to the 33,600 bits per second that is now
the
standard for hard-wired modems. So to download

this newsletter on a cellular modem would take more than 40 seconds.

But cellular is not the only radio telephone solution. A number of
companies
provide products called “Wireless Local Loop” (WLL) systems to provide
radio
interconnection

between telephone central office equipment and customer homes and
businesses.
These systems are particularly popular in developing countries where
telephone
service can be provided without installing thousands of miles of wire.

The way a WLL system works is this. First, we need a phone company.
Phone
companies have buildings with a computer in them that is called a
Central
Office (CO). A CO is just a really big switch. It listens to off-hook
telephones and translates the keypad button presses into directions to
connect
to on-hook phones which it then sends a ring command. Someone picks up,
and we
have a route between two phones. [note: this isn't really how it works,
but it
is conceptually correct and once upon a time it really did work that
way]

A WLL only replaces some of the wire, but to do that it has to “fake”
some of
the features of a CO. That makes it a bit complicated to build, but
really
simple to use. A WLL comes out of the box in two pieces. One is
attached to the
telephone company wherever you can find a telephone wire. This can be
at a
neighbor’s house, a nearby business, or it can be tacked to a telephone
pole
(the must be done by a company lineman).

The other end of a WLL system is placed at your homestead where you
need
telephone service. All it needs is power and a clear line of sight
(more on
this later) to the other half of the WLL equipment. These two pieces of
equipment, one at your homestead and the other attached to telephone
wiring,
provide a two-way radio link that acts just like wire.

Standard telephones, fax machines, answering machines and computers can
be
connected at the homestead end and will operate just like they were
wired
direct to the phone company. Well, almost.

Two different standards are used for WLL equipment. Older systems use
lower
frequency radio signals around the 49 Mhz band. Compared to wire, these
low
frequency systems are

more prone to electrical interference and do not provide nearly as high
a data
rate for computer communications. A 49Mhz system will perform well for
voice,
will be adequate

for fax and will likely make you impatient when used for computer
communications.

Newer equipment is based on Spread Spectrum (SS) signalling in the the
900 Mhz
band. These systems provide superb signal quality and will support data
rates
far higher than normal telephone connections allow. A 900Mhz SS system
will
perform as well or better than any wired phone system and will even
support an
ISDN connection for you truly serious data junkies.

Installation of either system is pretty straight forward, but there are
some
rules to follow, both technical and regulatory. Technically, the 49Mhz
and
900Mhz systems are somewhat different because of the difference in
frequency.
The technical differences give rise to different regulations governing
the use
of these systems.

In a nutshell, the regulations are, surprisingly?, simple: thou shalt
not
interfere with thy neighbor’s signal.

The 900Mhz equipment that uses Spread Spectrum signalling is inherently
a non-
interfering technology so the Federal Communications Commission (FCC)
requires
no licensing or registration of any kind for the operation of 900Mhz SS
equipment. [the equipment itself is type rated with the FCC by the
manufacturer]

The 49Mhz equipment is a different matter. These systems can interfere
with one
another and with other authorized uses of the same frequency band, so
the FCC
requires a “frequency coordination” within an area to keep folks from
stepping
on each other. This is done by listening on a range of frequencies and
picking
one that seems to unused. This assignment is then reported to the FCC
so that
others may avoid that frequency in the same geographic area.

Which ever system is employed, there are some common characteristics
that will
control how the system is installed. Remember we said the two parts of
a WLL
must have a clear line of sight between them? Well, here’s the reason.
A 900Mhz
radio signal follows a path that is every bit as straight as a ray of
light, so
you must have a completely unobstructed signal path: if you can not see
one
antenna from the other then the antennas can’t “see” each other either.
The
word “see” in this context is to be taken literally. Can you see
through a
tree? Neither can a 900Mhz radio signal. This limits or WLL to what is
termed
(for obvious reasons) “line of sight.”

Satellite TV antennas work the same way (on even higher frequencies
than
900Mhz). On one system I installed, I had to move the antenna about 6
inches
one direction because it was aimed directly at the trunk of a large fir
tree on
a neighboring property. In one place I

had near zero signal and six inches to the left I had near maximum.
Line of
sight!

Which brings up an important point. You do not need to be able to see
the other
antenna with your naked eye. Feel free to use binoculars or a spotting
scope. I
certainly could not see the satellite 22,000 miles away in the example
above
and relied entirely on the receiver to aim the antenna.

In flat, open country, line of sight is probably about 7 to 10 miles
depending
on how high a pole you mount the antenna on–the higher you go, the
farther
your line of sight. If you live on a hilltop, you might get 30 miles.

The 49Mhz signal is much less a “line of sight” beast. It will go
through some
objects including smaller trees and will bounce off and around larger
obstructions. But “cheating” will cost you in signal quality, so it is
best to
stick with a clear path if you can.

The least attractive features of WLL systems is, you guessed it, the
cost. A
dual line system, which is my own minimum requirement, will cost
anywhere from
$4000 on up

depending on vendor, model, and installation issues (like range). To
put this
in perspective, keep in mind that running wire is a “dollars per foot”
sorta’
deal, so even a one mile run could exceed the cost of a WLL system.

In case you haven’t noticed, I consider it a personal failure if I
can’t build
it myself (just kidding, sorta’). What would it take to build our own
WLL?

First, let’s start with a 900Mhz SS wireless telephone from a phone
store. Some
of these have pretty good range. One such phone has a measured range of
a
couple miles. If we could hack in a better antenna for both the
hand-held unit
and the base station we might have a WLL solution capable of several
miles.
Even if a better antenna did not improve range, we would need an
external roof
mounted antenna to get good line of sight.

The base station for the phone would be placed where it had access to
the
telephone line and the handset would be located at our homestead. Since
the
charger is usually part of the base unit, we might need two complete
phones.
We’ll use one of the base units just to charge the handset.

We’ll need to replace the antennas with directional antennas that will
then be
aimed at each other. [Note: this probably violates FCC regulations as
the
equipment is certified for the particular antenna it comes with, but as
long as
it causes no interference it will never be known] Hacking the antennas
into the
base and hand unit would require a bit of radio skill but the parts
would be
real cheap.

Alas, this scheme will likely not pass data at all and will be tricky
to
interface to a computer modem anyway. On the other hand, this could be
a very
inexpensive approach, well less than a thousand dollars, to get a good
quality
voice (only) connection.

What if we turn this around and design first for the data connection
and see if
the voice connection comes along for the ride?

This gets really weird. Ever hear of Voice of IP? VOIP is where we
transmit
voice communications over Internet Protocol (IP), the way computers
communicate
on the internet. If we had two computers, one at our homestead and one
at a
telephone connection, we could transmit voice between them if they were
connected with a computer network.

With a radio modem we can do just that. There are several plug-in cards
for PCs
that allow two computers to be networked together without wire — radio
spans
the gap where wire is normally used.

We then add a telephone interface card into each computer and voila! we
have a
wireless internet connection and a standard telephone interface in one
unit.
Any standard telephone can be plugged into the telephone interface card
and
used just line a hardwired phone. Including a pair of directional
antennas,
such a system costs about $2000 at current prices.

Once you have the telephone interface cards, you can also make use of
the
(dozen or so) internet long distance telephone companies. These folks
work just
like the long distance phone companies except that the calls are
routed, for
free, across the internet.

A “build-it-yourself” offgrid phone is not the right solution for most
people.
It is simply too involved technically. An off-the-shelf WLL or a
modified
portable phone however is an option suitable for nearly anyone.

Survival Communications

This is the only book in the category that I am aware of, and is an
important
book for anyone interested in emergency preparedness. Note that the
author only
deals with survival communications as the title promises, which does
not
include normal phone service and such.

Buy it at Amazon for $19.95

Rural Telephone and Internet

This little gem, well it’s actually 200 pages, has just about
everything you
need to know to make phone calls over the Internet. Why would you want
to do
that? Two reasons: long distance is FREE (or nearly so) and an Internet
connection may actually be easier to get than a phone line! The CDROM
included
with the book has a bunch of useful software. A bunch more can be
downloaded
from the Internet.

Buy it at Amazon for $23.96