PV Gap

Casey Said:

Help With a Science Fair Project?

We Answered:

Check out Edmund's Scientific, they have great science kits for alternative energy.

The question of which is better depends on the amount of resources available at the site. If a site is sunny but not windy, solar is more efficient. If it is windy and not very sunny, wind is better. Many people install hybrid systems that have both solar and wind, because generally when there is a lot of one, there is not a lot of the other.

Kathleen Said:

What is the best kind of motor to use for a homemade RC car?

We Answered:

The simplest and most efficient type would be a permanent-magnet DC motor. Unless he is planning to build his own, they can be found through many industrial surplus sites such as All Electronics Corp, http://www.allelectronics.com/ B.G. Micro, Electronics, http://www.bgmicro.com/ Herbach & Rademan http://www.herbach.com/ MPJA http://www.mpja.com/index.htm and many others.

Before ordering, though, he will need to learn some basic physics in order to determine how much torque he will need from the motor, how its weight will affect the performance of the car, how much energy is wasted in the motor, etc. Otherwise you will be spending lots of money for lots of motors!

Frederick Said:

Solar powered electric poultry fence?

We Answered:

go to a farm store and they will get you what you need...Gallagher makes very good products, we use this brand on the farm for all our electric fencing. for this length of fence you do not need a very powerful unit. Good luck with the poultry

Lester Said:

micropondless waterfall kits?

We Answered:

thesunnygarden.com