Comments on: Mariah Power – Low Cost Wind Energy

By: robert

robert — Sun, 28 Mar 2010 20:10:41 +0000

I think an independent study or three is needed. Not the UL type, but some good university research with NO BIAS. A windy area is needed to generate a realistic amount of consumer energy. We are all looking for ways to generate, how about learning how to cut back. Why aren’t the manufacturers of appliances and such doing real work on their products. Not the ‘Green’ or Energy Star rating, but real energy physics on the components in everything that uses electricity?

By: Bryan

Bryan — Wed, 18 Nov 2009 08:31:39 +0000

I think these should be in every major gym. Instead of running on a treadmill you get to push a turbine in circles.

Jokes aside I think I’m going to dig in a bit more for practicality. 7000 really isn’t that much. Whats the cheapest new car you can get these days, 14,000? Plus I’m from Hawaii (outer island), plenty of wind and really high electric bills. If it managed 100% of household power this would pull a full return in less than 10 years.

By: slaps

slaps — Tue, 17 Nov 2009 22:44:24 +0000

UncleTOTO, I never heard turbines produced 70% power at half speed. I thought they produced 25% power at half speed. Could you cite a reference? I would like to look into this.

By: UncleTOTO

UncleTOTO — Tue, 17 Nov 2009 14:00:21 +0000

Haha, usually the wind turbines produce 70-80% of the max amount even by half speed, so it is no problem. of course I’m sure everyone can get a map where the winds are shown, average, windy days. If you don’t have enough wind, do not install. There are however cheaper appliances.

By: Alwi

Alwi — Fri, 16 Oct 2009 09:49:33 +0000

Why it is called a “new technology”? It’s just a Darius rotor invented about 80 years ago?

By: John

John — Mon, 05 Oct 2009 04:58:07 +0000

How many regions in the US actually get a 12 mph average wind speeds? I live in Reno, NV and the average annual wind speed is 7 mph. How much power would this thing produce at 7 mph average? For those of you who don’t know Reno is a very windy region, so living in a region with 12 mph averages would seem to be quite rare. I’m thinking out on the plains of the midwest or out on the open ocean. Plus wind at 30 feet and below around residential areas is very inconsistent. The cost benefit on these gizmos just doesn’t pan out and time will ultimately tell how these things were not the wisest of alternative energy investments. Even the standard 60 foot tower turbines in this wattage range need at least a 13 mph average wind resource to compete with solar PV. That’s assuming the solar system is located in an unshaded area and not in Seattle or the North East. Average household consumes about 6000 kwhs per year. In Reno, you would need about 4-5 of these things to offset the power for the average home. About 21k after the 30% tax credit. In Reno, a 3.4kw PV system would produce the same amount of energy and cost about 18k after the tax credit. The wind costs more and requires a significant amount of maintenance. The PV system requires almost no maintenance and most modules are warrantied for 25 years. PV technology has been tried and tested for over 45 years now. Most inverters will need to have the fans replaced about every 7 years. Under 50 bucks. Capacitors inside the inverter will most likely need a swapping every 15 years. 4-500 bucks. Modules need a good hosing down and a squigee when they begin to collect dust. Residential grid-tied wind is simply a romantic idea in my book. Expensive kinetic yard art.

By: Raymond L.

Raymond L. — Fri, 03 Jul 2009 06:18:20 +0000

Living out here in the Mojave desert in California I can guarantee you one thing, the wind will never stop. I’ve been installing these Wind Spirals for Ray Walp now for 4 weeks and it is rare not to see them spinning. There are more days the breaks kick on because of high winds then days where they just sit there with birds on them.

If you have any questions feel free to call Mariah Power 1-757-857-4888

If your in southern California feel free to call the shop, I am sure someone can answer any questions you might have regarding the spirals.
1-760-371-5254

By: Harpal Singh Grewal

Harpal Singh Grewal — Wed, 29 Apr 2009 03:12:55 +0000

Sustainability should be in the minds of people. Try making the same wind mill in India, you shall know the difference. The costs will come drastically low. Same thing can be made for $3000 only. The biomass generator which is being made by Heavenly Farms is breaking even in two years or less.

By: russ

russ — Mon, 20 Apr 2009 21:06:20 +0000

Looks neat but look carefully at the power curve and the average annual wind speed in your location.

Unlike commercial wind turbines many of the residential types are rated at 25 mph (or there about) which is a storm condition.

The ‘cut in’ wind speed of 4 m/s (9 mph) is really of no meaning as the power produced is very small.

A typical wind velocity of 11 mph will produce (as per Mariah claims) about 1500 kWh. For commercial turbines they multiply the 1500 by a capacity factor of approximately 33% meaning 500 kWh annual production. The capacity factor covers variability of the wind plus maintenance.

This unit is under testing by NREL (I believe it is NREL) to verify the capacity at this time.

Considering the swept area of the Mariah Windspire the factory rated output seems very much on the high side until supervised testing shows one way or the other.

A document Apples & Oranges by Home Power is an excellent reference. Another is Wind Power Buyers Guide. Both are available at http://www.homepower.com

On the Mariah site they have a ROI calculator to help you. Only thing it leaves out is the cost (value) of money.

By: Amanda

Amanda — Mon, 20 Apr 2009 02:42:59 +0000

I think this is awesome. I personally do not mind waiting 20 years for my ROI. It’s $7,000 people, not 30 or $40,000 like others. It is practical and it’s safe for birds because they can see it better. What’s not to love? The argument that sometimes there isn’t any wind is a weak one. It is so rare for there not be even a 3 or 4 mile an hour wind. It is usually much higher. The average where I live is about 10-15 mph, which isn’t unusual. People need to embrace alternative energy and stop being so darn pessimistic. I’m buying one, and I’ll be a lot happier for it.

By: Alex

Alex — Sat, 04 Apr 2009 13:35:45 +0000

Jim, please see below:

#1 Reliability – (wind will not always be present) Energy from the wind can be stored when there is no wind. Some wind is always present at night when you do not use it. Most of the production at night is stored for later use during peak demand during the day. Any excess generation due to high winds is not going directly into the grid, it will go into storage.

#2 Infrastructure – (where to place the wiring) Wiring is the easy part that can be integrated into the overall holding frame.

#3 Biggest issue ever – How the Grid can compensate for the amount of energy produced by the wind turbines placing power on the grid when the wind blows, then stops. I see this causing a huge imbalance placed on the grid and the power plants ability to adjust quick enough to make up for this imbalance. -See #1.

By: Lia Versaevel

Lia Versaevel — Fri, 03 Apr 2009 20:42:08 +0000

I can hardly wait to install one of these in my Reno back yard! As more of these come into production, the initial costs will come down. I hope I can sell my excess power produced back to the local energy company. Great to see local people doing terrific things.

By: Anonymous

Anonymous — Tue, 10 Mar 2009 18:00:50 +0000

Katrina – you need to get your facts straight. Wind power is reliable, unlike fossil fuels, which are increasing our reliance on foreign countries. Yes, they may cost money, but not as much as we are spending on our current fuels, and isn’t it more valuable to have a clean environment?

By: Jim

Jim — Mon, 09 Mar 2009 18:41:30 +0000

I agree with Katrina, although for different reasons:
#1 Reliability – (wind will not always be present)
#2 Infrastructure – (where to place the wiring)
#3 Biggest issue ever – How the Grid can compensate for the amount of energy produced by the wind turbines placing power on the grid when the wind blows, then stops. I see this causing a huge imbalance placed on the grid and the power plants ability to adjust quick enough to make up for this imbalance.

It could lead to black outs like we’ve never seen before.

By: Katrina

Katrina — Mon, 09 Mar 2009 13:37:38 +0000

I think that wind power is not a good resource for alternative energy, because the windmills cost a lot of money, and they are not going to help us like they should.

By: chris gilbert

chris gilbert — Sun, 08 Mar 2009 00:12:10 +0000

I think we do not get to hear enough good things about the product. Are there free brochure or is all the inform on the web? Are prices going to come down due to more demand? How is the production in Ohio going? Thanks for your time

By: Pete

Pete — Wed, 18 Feb 2009 21:50:02 +0000

I’ve had the chance to see a prototype up close and the engineering is just amazing; it’s completely silent and turns at very low winds speeds! They’re also rated for 100mph and will shut down automatically. Lots of updates on their manufacturing news so check their site for details:
http://mariahpower.com

By: hugo

hugo — Wed, 03 Sep 2008 08:13:15 +0000

While aesthetics and space requirements are a variable in the wind energy equation, at the end of the day a few kilowatts of power at such expense does not make it useful.

Also the long term cost needs to be factored in:
- Resistance to hurricane and gale force storms?
- Mean time between replacement of parts?
- Service costs?

By: erikv

erikv — Wed, 20 Aug 2008 14:12:20 +0000

Fixed electricity cost is about $0.11 per kWh where I live. At 2000 kWh/year, it’s going to take ~22 years for ROI (shorter if electricity gets more expensive — which it will). Still hard to justify a 20+ year ROI to the wife on a product that only has a 10 year warranty. I’ll save more by replacing my SEER 10 A/C compressor with a SEER 21 unit…

By: mw

mw — Fri, 15 Aug 2008 16:09:10 +0000

They don’t say what the life span of the equipment is, so it’s impossible to estimate return on investment, but I agree the equipment is probably only going to
last 10 years, and if so you would want to recover your costs within 7 years max to make it worth it. Bottom line – cost must come down. $3k price tag would probably make it worthwhile.