Wind Power Generator
NOTE: JMI is
no longer in the Wind Generator Business due to obtrusive, ever-shifting and
inconsistent local government regulations which make it impossible to predict
the costs of doing business and increase the costs beyond what the market will
We still have some parts for small generator systems. Call for
JMI is venturing into Wind Energy
for the home market doing business as JMI Wind Energy. Our
do-it-yourself electricity-generating wind
turbines are shown here.
Wind Power Generators
500, 1,000 and 2,000-watt versions
gears to wear out!
8 feet to 16 feet
110-volt or 36/48-volt output (12- or 24-volt by special order?)
Grid-tied or Off-grid Configurations
2-Year Factory Warranty (does not include return shipping)
$1,200 and up
plus tax and shipping
Links to Information on This Page
Equipment not included
Description of equipment
Related electrical information
Estimated power consumption of household appliances
2 kW generator
100 amp bridge rectifier
Dynamic braking system with dump load
Charge controller for 48-volt battery bank (off grid) or
110-volt grid-tie inverter
Equipment NOT Included
Wire (size will depend on voltage)
48-volt deep-cycle battery bank
12/24/48-volt DC to 110-volt AC power inverter
Includes anchor bolts, tower base and guy wire. You must supply concrete
pad(s) and 2" standard galvanized water pipe for 20 to 30 foot height.
You must get permits where required.
USB wind generator power logger
Data recording of battery voltage, amps generated, wind turbine RPM and wind
When looking at energy production costs and comparing solar versus wind
energy, you should consider the cost per unit of energy output. Having
said that, getting real numbers for wind energy generation is much easier said
than done. Solar energy is pretty constant except for cloudy days which
can be easily estimated. Wind energy, however, depends on the specific
characteristics of the generator and the duration and speed of wind activity,
which is much harder to estimate. Watch for more information that will be
included here at a later date. Complete cost recovery for the JMI Wind
Power Generator will average three to four years based on our best estimates at
this time using an average of 12 mph winds.
If you know the average wind speed for your area, the following formulas may be
helpful for estimating annual energy output. Jim Green at the National
Renewable Energy Lab (NREL) developed a simple formula for annual energy output
in Kilowatt-Hours (kWh).
kWh = 0.01328 x rotor diameter (in feet) squared x wind speed (in miles per
hour) cubed or
kWh = 0.01328 x (diameter)2 x (speed)3
If your average wind speed is 10 mph and you have a JMI Wind Power Generator,
your estimated annual energy output would be 0.01328 x 82 x 103
or 0.01328 x 64 x 1000 or approximately 850 kWh according to this formula.
As you can see from the formula, energy output increases exponentially with
increased wind speed. For more information, see the section titled Related Electrical
Wind energy is generally much cheaper than solar. However, for Water Well Pumping, we strongly recommend a solar well system.
We recommend Robinson Solar Systems
in Oklahoma (Toll Free at 866-519-7892). The prices start at $1,650 and
would allow you to use our JMI Wind Power Generator for other things such as
lighting and household appliances.
One more thing to consider is tax breaks. In Colorado, most wind and solar
energy equipment is tax exempt and municipalities and
counties are allowed to give property and sales tax rebates or credits to
residential and commercial property owners who install renewable energy systems
on their property. Contact the city and county where your property is
Description of Equipment
Grid-Tied and Off-Grid Configurations
The "electrical grid" or "power grid" refers to the network for delivering
electricity to your home. It includes power generating plants,
transmission lines and transformers. The term "off grid" is becoming ever
more popular as more people wish to be separate from, and not dependent on, the
power grid. Grid tied means that your equipment is tied into, or connected
to, the power grid. Our grid-tie inverter allows the JMI Wind Power
Generator to simply be plugged into a household outlet to reduce your electrical
bill. If used off grid, the system charges a bank of batteries which are
then used to power your equipment (cabin, boat, pump, lighting, communications
There are two basic configurations of the JMI Wind Power Generator system (or three with additional
equipment) as shown in the following chart.
JMI Wind Power
Turbine > Grid-Tie Inverter > Power Grid
Turbine > Charge Controller > Battery Bank > 48-volt
Turbine > Charge Controller > Battery Bank > 110-volt inverter > 110-volt
An electric brake to stop the wind turbine from turning
(shut down) by creating an electrical short.
Converts the "wild" variable alternating current (AC) output of the
generator to variable direct current (DC) which is necessary for charging batteries or feeding a grid
Dynamic Braking System
Electrically regulates the speed of the
generator by dumping excess energy into the dump load or other device. The
unit keeps the generator speed below 500 RPM during high
winds for maximum low-voltage output.
Used by the dynamic braking system for receiving dumped
1000-Watt Grid-Tie Inverter (included only in configuration 1)
Converts the DC output to 110vAC and matches the
phase with your household current. It allows the output from the JMI Wind
Power Generator to be fed directly into your house wiring (via a standard wall
outlet). The inverter includes a bridge rectifier, dynamic braking system
and dump load controller and is therefore, along with the dump load, the only equipment between the
generator and grid. (This configuration does not use any batteries.)
If the generator output overpowers the dump load controller, the system will
disconnect from the generator. Two grid-tie inverters can be used in
parallel to give up to 2000 watts of output with the 2000 watt generator.
A 220vAC version is available.
If you are using less electricity than the generator is producing, it will feed
into the electrical grid and run your electric meter backwards!* Otherwise, it will slow down your electric
meter. The grid-tie
inverter will automatically switch off if the grid is down (called "island
* Installing the Grid-Tie Inverter may require a
different electrical meter, a ground fault interrupter (GFI or GFCI) outlet,
which can typically be identified by a red reset button, and installation by a
certified electrician. We recommend contacting your electrical utility
before installation. The Grid-Tie Inverter is currently not UL approved,
therefore you must assume all liability when using the device.
1000-Watt 48-Volt Charge Controller (included only in configuration 2)
Prevents batteries from being
overcharged and over discharged. In includes a bridge rectifier,
dynamic braking system and dump load controller. The system shuts off output
when the battery bank output is too low. (NOTE: 12 or 24-volt Charge
Controllers are available by special order.)
12, 24 or 48 Volt DC Output
The battery bank can be configured for 12, 24 or 48 volt output. The generator will reach 12 volts before 24 volts
which means that low-wind areas will work better with a 12-volt system.
Since RVs (recreational vehicles) are wired for 12 volts, that may determine your
choice. However, a 48-volt system (standard with the JMI Wind Power
Generator configuration 2) is better because it uses smaller
(higher gage) wire. This will require 12-volt batteries to be connected in
series (see below) to reach the higher voltage.
Deep-Cycle Batteries (not included)
The battery bank for the JMI Wind Power Generator should be built with
deep-cycle batteries. A deep-cycle battery is one designed to be regularly
discharged using most of its capacity. Compare that to a starter
battery, such as found in any automobile, designed to deliver short, high
bursts for cranking an engine, using only a small part of its capacity. A
marine battery is usually a hybrid between a starter and deep-cycle battery.
A deep-cycle battery is designed to be discharged between 50% and 80%. It
can be discharged to below 20% of capacity but the lifespan of the battery will be reduced by
such deep discharges.
12/24/48-Volt DC to 120-Volt AC Power Inverters (not included)
DC to AC
power inverters convert 12-volt or 24-volt direct current (DC) input to 120-volt
alternating current† (AC) output. They typically have two to four standard
sockets for running household equipment. These units are readily available
from local auto, hardware or department stores and on the internet (see Inverter
Basics below). This type of equipment would be connected to the battery bank
to deliver 110-volt household current and is not necessary when using the
† The AC is alternating at 60 cycles per
second or 60 Hertz, abbreviated 60Hz. Standard household AC in the United
States is typically written as 120vAC/60Hz.
In alternating current, the flow of electrons reverses periodically which is
represented by a waveform. There are two basic types of inverters, square
wave (including modified square wave sometimes called modified sine wave) and
pure sign wave. Square wave inverters are cheaper to manufacture and are
the type found in big box and auto parts stores. A pure sign wave inverter
produces a nearly perfect sign wave that is essentially the same as a utility
companies output on the power grid. (Our grid-tie inverter produces a pure
Square wave inverters will work fine for most appliances and electronic
equipment except some sensitive equipment like laser printers, fluorescent
lighting, audio equipment, medical equipment and electric shavers. Any
device that contains a motor with variable speed control will not work.
You may hear a buzzing sound in the audio of a TV or similar device.
Generally, electronic equipment using an AC adapter will work fine.
In summary, many appliances will run hotter and less efficiently and some can be
damaged by square wave inverters. Appliances can run at 30% greater
efficiency, last longer and have less chance of damage on a pure sine wave
inverter which, in the long run, makes them more economical.
Wind Generator Power Logger (optional)
A USB hardware interface and software
program for data recording. It tracks battery voltage, amps generated,
wind turbine RPM and wind speed.
Related Electrical Information
Power in Watts = volts x amperes (amps).
Example: 2.5 amps x 120 volts = 300 watts. An electrical device
rated at 2.5 amps running on normal household current (120vAC/60Hz) would take 300
watts of power. Therefore, the device would take 30% of the grid-tie
inverter's 1,000 watt power output or 15% of the 2,000 watt generator's maximum
output. And, of course, the capacity of any battery bank you have
configured can be calculated using the information on this page.
The Kilowatt-Hour (kWh) represents 1000 watt-hours and is the most common unit
of energy used by utilities when billing for energy usage. If the JMI Wind
Power Generator is producing 1000 watts continuously (24/7) for 30 days, that
would be 720 kWh (1000 watts x 24 hours/day x 30 days = 720 kWh) or 24,000 watt-hours
(Wh) per day. If you have a 10 amp device running on 120vAC/60Hz for 10
hours it would use half of the 24,000 Wh capacity (10 amps x 120 volts x 10
hours = 12,000 Wh).
The Ampere (amp) is a unit of measure of
electrical current (or flow). Batteries are often measured in ampere-hours to show
the total amount of electrical current capacity. The easiest way to understand this
rating is to remember that a device drawing 1 amp from a fully charged 200 amp-hr battery
will run 200 hours (1 amp x 200 hours = 200 amp-hrs). If the same battery was drained at
200 amps, it would
last about 1 hour (200 amps x 1 hour = 200 amp-hrs). Assuming a
12-volt battery bank, your energy capacity would be 2,400 watt-hours (12v x 200
amp-hrs = 2,400 Wh).
For this example, the following chart shows how long a particular electrical
device (or combination of devices) could be run by this battery bank.
24,000 watt drain: 24,000 watts / 120 volts = 200 amps, 200 amp-hrs /
= 1 hour
12,000 watt drain: 12,000 watts / 120 volts = 100 amps, 200 amp-hrs /
amps = 2 hours
100 watt drain: 100 watts / 120 volts = 0.83 amps, 200 amp-hrs /
0.83 amps = 240 hours (10 days)
25 amp drain: (25 amps x 120 volts = 3,000 watts) 200 amp-hrs / 25 amps =
Serial vs Parallel
The battery bank can be created by connecting batteries in series or
parallel (see illustration below). When connected in series, the voltages
of the batteries will be added. When connected in parallel, the capacities
(amp-hours) of the batteries will be added. If the positive terminal of a
each battery (except for the last one) is connected to the negative terminal of
the next battery, they are connected in series.
If all negative terminals are connected and all positive terminals are connected
the batteries are in parallel. For example, if two 12-volt 200-amp-hour batteries are
connected in series, the output voltage will be 24 volts and the capacity will
be 200 amp-hours. If two 12-volt 200-amp batteries are connected in
parallel, the output voltage will be 12 volts and the capacity will be 400
amp-hours. When building your battery bank, be sure to use batteries
of the same type and rating.
Inconsistent Household Voltage
You may be wondering why you see 110 volts in some places and 120 volts in
another. In the United States and Canada, voltage designations of 110, 115
and 120 (small appliances) as well as 220, 230 and 240 (large appliances) are
used interchangeably to designate the same voltage ranges for standard household
outlets. The 110/220 volt designations are old and familiar. The
115/230 volt designations are used with newer design standards where the
equipment is designed to operate within plus or minus 10% of those voltages.
Electrical utilities typically use 120/240 volt standards with a plus or minus
5% variation. So, not to worry... In household voltage math, 110 =
115 = 120 and 220 = 230 = 240!
Estimated Power Consumption of Common Household Appliances
Power consumption will depend on many factors (brand, size, power levels, amount
of time at each power level, features, cycles, modes, start-up load, etc.). These are only estimates
for comparison purposes. Note that for microwave ovens, the cooking power
is not the same thing as power consumption. Check the back of the
appliance or the owner's manual for power ratings. Use these numbers to
estimate the total watt-hours (Wh) (wattage rating x hours run) the wind
generator needs to supply on an average day.
||Power Consumption in
Incandescent Light Bulb
Drill - 1/4" to 1/2"
Stove (Range & Oven)
(Average: Range = 1,000, Oven = 2,300)
- Color, Solid State
Federal Tax Consequences
Check with your tax consultant or tax software for current Federal tax credits
(dollar-for-dollar reduction of tax liability) or tax deductions (reduction of
the portion of income on which the tax is based) and eligibility requirements
(eligible equipment, purchase time frame, maximum purchase costs allowed, etc.).
Colorado Sales Tax Exemption (Updated for 2012)
Components used in the production of alternating current (AC) electricity from a
renewable energy source, including wind, are exempt from state sales and use
tax. These components include, but are not limited to, wind turbine
generators, rotors and blades, supporting structures, towers and foundations,
wiring and control systems, inverters and generator step-up transformers.
The exemption does not include anything beyond the step-up transformer located
at the production site, labor, energy storage devices and remote monitoring
Local Property and Sales Tax Exemptions in Colorado
Cities, counties and special districts have the option to exempt renewable
energy production components from property taxes and/or sales and use taxes.
Check with your local tax authorities. The Regional Transportation
District (RTD) and Scientific and Cultural District in the Denver Metro area are
included in the sales tax exemption for renewable energy.
No federal or state taxpayer money
was used in the development of products sold by JMI Wind Energy.
Jim's Mobile, Inc.
d/b/a JMI Wind Energy