Power: 2000 Watts @ 30 mph+ Voltage: 24, 36, or 48 Volt DC operation (specify), 150 Volt, 240 Volt DC, for running AC grid-tie inverters, available at no extra charge.
Diameter = 10 feet or 12 feet Length = 13 feet+ Cut-in speed 7 mph
Overspeed Protection: Side-furling using inclined tail pivot
Components: Frame with generator and yaw bearing, driveshafts with hubs, 8-foot propeller blades, pivoting tail boom, tail. Note: We are not making this 8-foot diameter right now, in light of increased performance at 10-feet and 12 feet
diameter.
Two Rotors Turn One Generator. The Tail Aims the Turbine, and Pivots for Overspeed Protection.
Above is a photo of an experimental unit. The production version that you receive has just 3 wires, very simple.
From: http://www.dualrotor.com/
Tags: Wind turbine
The Sun Flow solar system operates as a pre-heater. Its function is to
raise the temperature of the water going into the existing system.
Year-after-year your maintenance-free SunFlow system will go on
providing a substantial part of your hot water needs.
A. Cold water inlet: The cold water line which normally goes directly into
the existing water heater is diverted to the cold water inlet on the first Sun
Flow collector.
B. Bottom enclosure: Each collector is nested in an enclosure made of
space-age UV stabilized materials for years of durability
C. Reflective mirror: An aluminized solar mirror with over 90 percent
reflectivity and a protective coating to guard against moisture degradation.
D. Outer glazing: Each collector is covered with a dome made of twin
walled GE Lexan®. The Lexan dome is especially designed for passing
solar energy while holding in heat. The dome and bottom enclosure
combine to form a greenhouse effect for additional insulation against
windchill factors.
E. Stainless steel collector/cylinder: Each cylinder is made of 316 L
stainless steel and coated with a special, highly efficient, black solar coating
to absorb the sun’s energy. Each cylinder stores over 25 gallons of water.
F. Inner glazing: Each collector is enveloped by solar-designed GE
Lexan®.
G. Hot water outlet: The hot water from the collector is then drawn from
the top of the first collector to the bottom of the second collector, where it is
raised to an even higher temperature. This serpentine plumbing style
always results in the hottest available water in the system being drawn into
your existing water heater.
The SunFlow’s cylindrical tanks combined with the parabolic reflective
mirror design captures the sun’s full rays at all angles as the sun moves
across the sky.
SunFlow is a maintenance-free combination collector and storage solar hot
water heating system that has been in use for over seventy years. The
SunFLow Integral Collector Storage (ICS) system eliminates the use of any
electrical or moving parts, thus producing a trouble-free ICS system. To
maintain highest efficiency, you may wish to periodically wash off the
accumulated dust on the domes.
ICS units are excellent choices for residential new construction in U.S.
Sunbelt or other mild climates that do not experience hard freeze conditions.
servamaticsolarparts.com/index.html
www.dannysvacuumshop.com/solarhotwaterindex.html
An easy 200 watts in about a 20 mph wind or so, lighting the four 50 watt car
headlight bulbs you see at Doug’s feet. We get much more power than this in
higher winds. This kind of power output is unheard of for an 18″ diameter
horizontal axis windmill! – the secret? Multi-Rotor technology, made possible
by the strength of modern carbon fiber materials.
This rotor is really thirteen rotors harnessed as one, giving an order of
magnitude (~10 times) more power than a single rotor design of the same diameter.
In stronger winds this prototype blows out these lights like flashbulbs – poof!
link: www.speakerfactory.net
Tags: Wind turbine, Windmill
1. A generator
2. Blades
3. A mounting that keeps it turned into the wind
4. A tower to get it up into the wind
5. Batteries and an electronic control system
………..
When used as generators, motors generally have to be driven far faster than their rated speed to produce anything near their rated voltage. So what you are looking for is a motor that is rated for high DC voltage, low rpms and high current. Steer away from low voltage and/or high rpm motors. You want a motor that will put out over 12 Volts at a fairly low rpm, and a useful level of current. So a motor rated for say 325 rpm at 30 Volts when used as a generator, could be expected to produce 12+ volts at some reasonably low rpm. On the other hand, a motor rated at 7200 rpm at 24 volts probably won’t produce 12+ volts as a generator until it is spinning many thousands of rpm, which is way too fast for a wind turbine. So shop for motors accordingly
………… next
Tags: Wind turbine
This alternator uses rotating magnets and a fixed stator with handwound 3 phase coils. This design is applicable to wind, water, engine, even human and animal power.
1000 watt wind turbine to help charge the battery bank that powers our offgrid home. It’s a permanent magnet alternator, generating 3 phase ac, rectified to dc, and fed to a charge controller. The magnets spin with the wind, the coils are fixed, so no brushes or slip rings necessary.
Tags: Wind turbine
Solar panels collect heat energy from the sun. We call this heat solar thermal energy. A simple example of a solar panel is a closed box with a top made of a transparent material such as glass or plastic.
The sun shines through the glass and heats up the inside of the box. This is the same type of heating that happens to the inside of a car when it sits in the sun. In some cases the inside of the box is painted black so that it absorbs more heat. The heat that is collected inside the box can then be used for several purposes. The most common uses for solar panels is to heat air or water.
A system that uses solar thermal energy to heat air is not complex. A transparent top is attached to a box. The box has an inlet pipe for cool air. The cool air can be pushed into the box using a fan. The cool air moves through the inlet pipe into the box. Inside the box the air is warmed by the heat energy from the sun rays. As more cool air is pushed into the box the warm air is forced out the other end of the box through the outlet pipe. 
The warm air can now be used to heat something like your home. Some very large systems use a solar panel on the roof of a house to heat a whole room. The warm air in that room is then blown through vents to heat the whole house.
Solar panels that are designed to heat water work almost the same way as ones designed to heat air. In a simple example there is a pipe that runs through the inside of the box.
The sun rays heat the air inside the box. The heat in the air is transferred to the pipes then the heat in the pipes is transferred to the water. As cool water is pumped into the inlet pipe the warm water is forced out of the outlet pipe. 
We can now use this warm water for something like a bath or shower.
The terms “Solar Panel” and “Photovoltaic Panel” describe two different devices. We use the terms as follows:
A Solar Panel collects and utilizes heat energy from the sun.
A Photovoltaic Panel transforms light energy into electrical energy.
Tags: heat
This cast epoxy impeller is designed to provide efficient performance on micro-hydro Pelton wheel water turbines. Power from water increases with head and increases with flow rate but is limited by pipe friction.
Maximum power for any pipe size occurs when the frictional losses in the pipe equals one third of the static head. Any increase in flow rate beyond this point will result in less power. Both power and water usage should be controlled by a choice of nozzle sizes.
Adequate filtration on the water supply is essential. The area of the intake screen should be large enough to reduce the effect of clogging by leaves etc. The screen should have holes small enough to exclude any particles that may block the smallest expected nozzle size. The Pelton wheel is suitable for nozzles up to 13mm diameter with nozzle aligned such that jet strikes runner in centre of bucket as shown.
Installation: The wheel is made to fit a 15 mm shaft. Correct attachment to the generator shaft is important. Thick stainless steel or galvanized washers of at least 25 mm outside diameter should be used on both sides of the wheel to distribute pressure evenly over the casting. A spring washer is essential. The nut should be tightened to 6.5 N/m torque (firm with a 160 mm spanner). Alignment Correct alignment of the water jet is important with this design of impeller, both to achieve maximum efficiency and to prevent possible damage to the blade edge of the runner buckets. The nozzle must be adjusted so that the jet strikes the wheel tangentially 57 mm from the centre of the wheel.Check also that the jet impinges on the centre line of the runner buckets. A clearance of at least 65mm is recommended between runner and turbine case.
Pelton Runner Specifications: Impeller Material: Cast Epoxy Resin Composite, Diameter 133mm, Shaft Diameter 16mm, Keyway Width 4.76mm ( 3/16th inch), Hub Depth 22mm, Nozzle Aligment 57mm tangentially to centre of shaft
Continue reading www.selfpower.co.nz
This alternator starts to charge my 48V battery bank at 120 rpm. At 200 rpm we generate just over 2000 Watts. It’s fairly exciting — it’s easy to maintain this level of power output with even the low grade wood we have around here. At this power level the alternator doesn’t hardly warm up at all, and things seem very efficient. We did run it up to 3KW output for a short while, but I couldn’t keep the pressure up in the boiler. Seems like the best we can hope for is about 2.5KW sustained… which is great! Much better than I’d hoped.
http://www.otherpower.com/steamengine.shtml