Water is just below air at the top of the list of things you need
in order to postpone dying. Virtually unlimited, uninfected
supplies of fresh water are one of the unsung heroes that enabled
the big lifespan increase in the Western World through the 20th
Century. So maintaining the flow is a high priority.
The Typical Farm Well Pump...
The best source of clean water is a well drilled into a reliable
aquifer. The most common set-up for getting the water from the
bottom of the well to your spigots is a grid-powered, automatic,
submerged pump with pressure tank. If you acquire rural property
with an established home site, this is what will probably already be
there. If you buy raw land, this may be the simplest thing to have
installed.
The well casing is essentially a big (usually around 6" diameter)
pipe that goes straight down to into the ground to below the water
level. Near the bottom of the casing, deep under water, is the
actual pump. A cylindrical thing connected to what is essentially a
heavy-duty hose and some wires which run back up the casing to the
surface. The upper end of the hose connects to pipe which, in-turn,
connects to a 20 to 50 gallon tank and then out to the homestead
plumbing. The wires from the pump run to a pressure switch at the
tank, which then connects to the household panel electricity.
When the pressure in the tank is below a set minimum (usually 30
to 40psi), the switch will send electricity to the pump, which will
force water up the hose pipe into the bottom of the tank,
compressing the air in the tank into a smaller space at the top.
When the pressure reaches a set maximum (usually 50 to 60psi), the
switch will stop power to the pump. The compressed air in the top
of the tank acts as a spring, maintaining fairly constant water
pressure for the plumbing without the pump needing to switch on
every time water is used.
Wells under 100' may use surface pumps to pull water up, but
deeper wells, and the higher flow rate needed for farms, makes the
submersible pump more common in most rural areas.
Alternative Power For Standard Well Pump...
If you've set-up a backup generator for your doomstead (as
detailed in another chapter), you're already ahead of the game. The
well pump should be powered along with everything else when your
generator is going. But you may not want to run the generator
24/7. So be sure to flush your toilets, fill your water jugs,
top-up the livestock troughs, and so-forth while the generator is
going.
A freestanding solar power station is a more long-term (not to
mention quieter) solution for running the well pump. (You may want
to read through the
Generator chapter for some info on
basic electrical stuff.)
Contrary to what you may have seen on
Captain Planet,
photo-voltaic solar panels are kinda' wimpy. The standard circuit
feeding my well pump can provide 3,600 watts. It would take thirty
big solar panels to collect that much power. At high noon. On a
clear day. So you can't just run a typical well pump system
directly from solar panels.
Fortunately, a pump doesn't draw full power constantly. In fact,
most of the time, it doesn't use any. When it cycles on, it pulls a
big surge of electricity for a second or two, then settles down to
more moderate wattage until the pressure maxes out and it cycles off
again. While solar panels collect only a relative trickle of
energy, they do it for hours on-end on clear days. That can add-up
to enough to supply the big gulps of power needed for the pump, if
you have some way to store the accumulated energy.
We have two 12 volt, 10 amp solar panels connected to four big
marine 12v batteries. (These are better for extended
charging/output cycles than automotive starting batteries, and
better for the high-amp starting load from a well pump than pure
deep cycle batteries.) There's a 35 amp-rated charge controller
between the panels and batteries, which keeps the batteries from
being overcharged by effectively disconnecting the panels when the
battery voltage gets above 15v, reconnecting them when it drops
below 13v. During the day, the solar panels act as a trickle
charger to top-up the batteries for when the pump needs power, day
or night.
Problem is, the solar panels and batteries produce low voltage,
Direct Current. The well pump runs on 240v Alternating Current. To
rectify this, we use an inverter. A device which inputs low
voltage, high amp, DC electricity and outputs high voltage, low amp,
AC electricity. Once connected to the inverter, the pressure switch
controlled well pump works exactly the same as when it's on grid
power.
Naturally, the solar panels have to be out in the open. Usually
oriented to face directly towards the sun at midday in the Spring
and Autumn. It may be worthwhile to mount them in a way that allows
you to adjust them (more upright in Winter, at a shallower angle in
Summer) to catch maximum sunlight.
The batteries and charge controller need to be under cover. The
inverter is the most vulnerable component, and needs more protection
from the elements. It is also capable of producing sparks which
could ignite gas vented from the batteries. So the inverter needs
to be enclosed separately from them. We have the batteries under an
old camper shell, with the inverter in a large wooden box also under
the shell. A canister of silica gel beads are kept in the box like
a gun safe, to reduce moisture condensation on/in the inverter.
Remember that low-voltage, DC electricity doesn't carry well over
distance. Keep your components reasonably close together, and wires
short. Use the heaviest wire practical for connecting the panels to
the charge controller, and controller to the batteries. Use the
thickest automotive battery cables and clamps to connect the
batteries to one-another and the inverter. Our inverter takes 12vDC
input, so the entire DC side of the system is wired in parallel.

We use a modified sine wave 12vDC to 240vAC inverter which is
considerably more affordable than pure sine wave inverters in the
5000 watt range, and works just as well for our purpose. Oddly
enough, it has weird sockets designed to accept a lot of different
electrical plugs, including standard American 120vAC extension
cords. This could actually be a hazard if someone plugged a 120vAC
device into these 240vAC-only sockets. But, since the inverter is
out by the well house, that's not likely to happen, and the use of a
common plug came in handy for us.
After switching off the pump circuit at the main panel (of
course), I reworked the well house junction box so that, instead of
connecting the underground electrical conduit from the house to the
pressure switch, the line from the house connects to a short 'pony
tail' ending in a heavy-duty standard type extension cord socket.
The line from the pressure switch connects to a section of heavy
extension cord long enough to reach the inverter in its box, and
ends in a standard plug. This enables me to switch pump power from
grid to solar simply by unplugging from one and plugging into the
other. There is no 'suicide cable' risk, as the pronged plug is
never live when out of a socket, and no chance of backfeeding as the
well can only be plugged into one power source at any given time.
Operating Notes:
Always power-up the inverter first, then connect a load. In
fact, I've found that it's best to leave the inverter on at all
times, even when your using grid power, as powering up from cold
seems to really tax the electronics.
Try to do your heavy water use in the middle of the day, so that
the batteries will be charged up by the morning sun after the
night's drain, and so that the afternoon sunlight can charge the
batteries up before the coming night.
You may need to open up your power system to fresh air in the
heat of Summer. The inverter will shut down if overheated.
Remember to put the lid on your silica canister when the inverter
box is open.
Still on my
To Do List (yes, after two decades on the doomstead,
I still have a long one!) is the addition of a small wind turbine to
top-up the batteries during the dark seasons. It should be possible
to simply wire it in like another solar panel, although another
charge controller may be needed.
During the aforementioned extended periods of gloomy weather, I
have run a trickle charger to keep the batteries up on occasion. In
a few pinches, I've used jumped cables from an automobile to charge
the battery array.
Off-Grid From the Start...
If you're starting from scratch, or determined to be fully
self-sufficient, you may want to skip the whole grid AC and pressure
tank set-up altogether.
You can't get much more Old School than a hand pumped well.
(Well, you could lower a bucket on a rope, I suppose.) No
electricity involved. Back down in the Lowcountry, a lot of Old
Timers (including my grandfather) insisted on having a pitcher pump
backup for their well.
Of course, hand-pumping water for just household use can be a big
chore. If you need more fore livestock, irrigation, etc., a hand
pump isn't going to be sufficient.
But it's not quite rocket science to build a windmill and have it
mechanically drive the pump for you. You'll see this sort of thing
filling stock tanks on big cattle farms across the country.
If you set up a windmill-driven pump, and have it push water into
a water tower, you can not only have plenty of water even when the
wind is calm, but also have gravity-provided water pressure to your
plumbing. (You'll need to make sure the bottom of your water tower
is a few feet higher above the ground than your highest shower
head!)
A limitation on hand and mechanically-driven wind pumps is that
they can't pull up water from very deep wells. Nothing really beats
a submersible, electric pump for that. But, using the same water
tower approach as a windmill, you can forego the battery array and
inverter to have solar panels and/or wind turbines power the well
pump directly.
The problem is that low voltage, DC pumps drive water up the pipe
slowly and at low pressure. So they won't work with a typical
pressure tank. But they can tickle-fill a water tower whenever the
sun shines or wind blows... If you have enough panels and/or
turbines.
Artesian wells...
Some underground water sources are naturally pressurized to the
point that you don't need a pump at all. Just drill a pipe into the
aquifer and the water gushes up. But you're very lucky if that
happens, because it requires rather specific geological conditions
which are not that widespread.
Other sources...
Deep wells are your safest, most reliable source of potable
water. Surface water, such as creeks, ponds, springs, collected
rain, and condensation are subject to
many sources of
pollution. As infrastructure declines, the likelihood of surface
water sources being contaminated will get even worse.
Filtration, boiling, distillation, UV, and chemical purification
of surface water may be useful means to get through rough spots.
But, unless you are part of a group that can do this on a fairly
large scale, it won't be enough to maintain a comfortable standard
of living long-term.
Tips...
In the
Doomstead Layout chapter, I mentioned that you
want the well house near the middle of your barnyard to minimize
hose drag. Even so, you're probably looking at 100' or more hose to
reach all the stalls and paddocks. Don't cheap-out and try to use
ordinary, vinyl-shell garden hose. Not only will it fail often (I
mean every few weeks), but it also doesn't patch well due to its
layered construction. Get the heavy, solid rubber hose. It's more
than worth it.
For the 'way down yonder' troughs and garden sprinklers, it may
be a good idea to just leave a section of hose running back from
them to within range of your regular hose, so you can just connect
to run water out there without having to drag the full length every
time.
Rather than a spray head or other restrictive valve on the hose
(which slows down bucket filling), I prefer about a 6' section
salvaged from an old hose with replacement fittings on both ends.
Having this on the end of the main hose allows me to crimp the water
off a few feet from the outlet as I thread the hose through a stall
wall or paddock fence to water the stock, or to allow easy
connection to one of the aforementioned extension lines. The
frequent crimping will wear the hose, but just the easily
replaceable 6' piece.
Weird thing about the solid rubber hose is that it will conduct
high voltage electricity. So you (or your critters) can get zapped
running it over an electric fence. Wrapping about 18" with electric
tape just where you need to lay it across the fence will fix this.
Inverters...
Solar panels can last decades. Batteries can go several years,
and can be rejuvenated if replacements aren't available. Charge
controllers seem fairly tough, and you can get by without them in a
pinch if you figure out how to balance panels/turbines, batteries,
and power usage. Inverters are the weak link in standard well pump
to alt energy conversion.
Modern, electronic inverters are simple to use, provide very
stable output, and are very efficient. But moisture, heat,
overloads, and various other things can mess them up. And they
aren't easily reparable. So it's worth investing in a backup or
three for the long term.
It's also probably a good idea to look into old-fashioned
mechanical inverters, dynamotors, and the like. These are basically
some form of DC motor driving an AC generator or alternating
switching system into a transformer coil. Nowhere near as efficient
or self-monitoring as modern electronic inverters, but they can give
you AC from DC sources, and can be repaired or even built from
scratch by a handyman.
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