October 31st, 2009
Tahini Raving Weirdo asked:
I am building a two-seater, electric catamaran, 21 ft. long, about 8 knots top speed, no sails, just two electric DC engines. I am aiming at a range of about 20 miles before it needs recharging, and my only recharging device will be a wind turbine. I’ve seen they do about 100 – 400 Watts when they are the marine type which usually attaches to sailboats; how long would it take for such a turbine to replenish energy in my boat, would anyone know? I’m hopeless with these things, but I still love doing them.
Thanks so much!
Patricia
Categories: Engineering |
Tags: Electric Boat, Watts, Wind Turbine | 9 Comments
October 30th, 2009
Jimmy C asked:
What solar panel is needed to charge four 12 volt batteries?
Voltage?
Amperage?
Wattage?
the batteries are car batteries and they are hooked up in series. That’s all I know since it’s not my project it’s someone elses.
Tom
Categories: Engineering |
Tags: 12 Volt Batteries, Amperage, Car Batteries | 1 Comment
October 30th, 2009
devconx asked:
I will like to make a solar panel at home. I know that they are not that expensive today but I thought it would be fun.
Patty
Categories: Engineering |
1 Comment
October 29th, 2009
hwaj99 asked: Due to the change in the wind speed, the speed of the wind turbine rotor changes, so at the output we get variable AC supply which means we do not get exactly constant voltage and frequency.
It can be control by controlling shaft speed and at the output by varying the load (Resistance).
I need to submit a case study about that so tell me about any site or e-book where I can find comprehensive details about that.
Ginger
Categories: Engineering |
Tags: Fluctuation, Wind Speed, Wind Turbine Rotor | 2 Comments
October 29th, 2009
Bill McCoy asked: How much of a solar panel does it take to charge a 9volt battery?
A double AA battery etc….
Doris
Categories: Engineering |
Tags: 9volt Battery, Aa Battery, Solar Panel | 2 Comments
October 28th, 2009
Peoplez asked:
Is it economically efficient to have wind power as your source of electricity?
Donna
Categories: Engineering |
Tags: Coal, Source Of Electricity, Wind Power | 8 Comments
October 27th, 2009
jchalase asked:
Should I build a Vertical Axis or Horizontal Axis Wind Turbine for this? We get a decent amount of wind every year (12 MPH in winter and 8 MPH in summer), the turbine would be no higher than 20 feet. So should i make a VAWT or HAWT? If you say VAWT don’t say ‘because it’s easier’ because I need to get as much power as I can outta this.
Nadia
Categories: Engineering |
Tags: Hawt, Horizontal Axis Wind Turbine, Vertical Axis | 2 Comments
October 27th, 2009
sharen asked:
How solar energy can be produced at competitive cost for the welfare of people at large?Presently what is the status of its use in india?
Jay
Categories: Engineering |
Tags: India, People, Solar Energy | 1 Comment
October 25th, 2009
israelsmonkey asked:
I’m trying to make a wind turbine but I have no clue how to get electricity from the alternator to the battery… PLEASE HELP ME!
Renea
Categories: Engineering |
Tags: Car Alternator, Clue, Wind Turbine | 5 Comments
October 25th, 2009
Tahini Raving Weirdo asked: I’m planning to build a catamaran from two surfboards, attach a DC pump motor, put a seat on it and a wind turbine (500W) and make this thing my commuter boat. It needs to cover 8 miles in under an hour and back, and I hope to recharge it over night using the wind turbine only (the thing will be moored in Otago Harbour, southern New Zealand, and I’m planning to swim out to it in the mornings using a wetsuit).
How many batteries do you reckon I need, how big an engine do I need to get up to about 10 knots, and how many wind turbines are necessary to recharge this thing over night?
As you can see, I’m a determined fool.
Windy
Categories: Engineering |
Tags: Boat Cover, Knots, Otago Harbour | 2 Comments
