News — solar power


Yeti 1250 What is a Watt Hour ? 0

Here's what some of the experts at Goal Zero have to say. Check out our offerings here

As you may have noticed, we use Watt Hours to explain the capacity of most of our products. For many of us, a Watt Hour isn’t something all that familiar. So, here’s a brief explanation of what it is.

A Watt Hour is a unit of measurement for power over a period of time (an hour), or in our case, a way of measuring capacity. One Watt hour is equal to one Watt of average power flow over an hour. One Watt over four hours would be four Watt Hours of power. As an example, a 100 Watt light bulb on a 400 Watt Hour battery (like the Yeti 400) would last, on paper, 4 hours.

A Watt, the measure of power, is usually calculated using this equation: Watts = Volts x Amps. To explain a little further, we will use a plumbing analogy. If we have a water pipe; Volts would be a measure of the water pressure (force) in the pipe, Amps would be a measure of the current or flow through the pipe. A Watt would be the measure of of what you can do with that water, like turning a water wheel. So, how do we determine Watt hours?

Watt Hours are calculated using a similar equation when dealing with batteries. An example of this would be that the Yeti 400 contains a 33 Amp Hour battery operating at 12 Volts. 12 Volts x 33 Amp Hours = 396 Watt Hours or roughly 400 Wh. Not only are Watt Hours a good unit of measurement for capacity, but it is also pretty universal when finding out how many times one of our GZ products will recharge something with it’s own battery in it (like a phone, tablet, or laptop). The Equation to find the Watt Hours of a battery gives us a universal measurement despite batteries on the market varying greatly in operating voltage and mAh.

Benefits of Cooking via power of Sun, SunOven 0


Saving Lives by Preserving Forests Around the World!

Deforestation Alternative

SUN OVENS International, Inc. is committed to providing an alternative to cooking with wood and charcoal in deforested developing countries that have been blessed with an abundance of sunshine.

SUN OVENS® can have an enormous impact on the everyday life of millions of people by:

  1. Reducing the demand on forests.
  2. Reducing health hazards.
  3. Improving women’s conditions

1. Forests are dwindling at a more rapid rate than ever before. One third of humanity, over 2.4 billion people, depends on wood and charcoal to prepare food and the worldwide supply of wood is rapidly decreasing. The demands of massive population growth and the inefficient conversion of wood to charcoal have outstripped much of the world’s forest’s ability to regenerate, creating a phenomenon known as deforestation.

Deforestation is the gravest environmental crisis facing the world today. Its far-reaching effects include:

  • The decreasing availability of firewood.
  • Removing the trees from an area is to remove its source of life. (Deforestation has left more than 25% of the continent of Africa almost useless for cultivation.)
  • Forests protect the soil against erosion and reduce the risks of landslides and avalanches.
  • Forests increase the rate that rainwater recharges groundwater as well as control the rate that water is released in watersheds, helping sustain freshwater supplies.
  • Forests affect the climate. The occurrence and strength of floods and droughts increase when they are eliminated.
  • Forests are an important source of oxygen.
  • Forests store large amounts of carbon that are released when trees are cut or burned.

The use of SUN OVENS® can eliminate the use of up to 70% of the wood which is currently being consumed for household cooking.

2. The acrid smoke from cooking fires subjects women and their children to levels of smoke that at times are often 100 times above the international safety standards. This results in 3 deaths a minute, totaling over 1.6 million deaths each year.

Bio-mass smoke has many harmful effects which can cause or contribute to:

  • Acute respiratory infections (Respiratory infections are one of the world’s leading child killers. A child is two to three times more likely to contract acute lower respiratory infections when exposed to smoke than an adult.)
  • Pneumonia
  • Tuberculosis
  • Lung Cancer
  • Asthma
  • Lower birth weights
  • Cataract
  • Nervous and muscular fatigue

The use of SUN OVENS® reduces the amount of acrid smoke from cooking fires by up to 70%.

3. In many deforested communities, the gathering of wood is no longer a simple matter. As the supply of wood decreases, women must travel great distances to find wood. Many women in developing countries must spend several hours each day collecting fuel-wood. As women and girls travel increasing distances gathering firewood, they are forced to expose themselves to greater risk of beatings and rape.

Once wood is gathered, women spend many hours stirring food. Food cooked in a SUN OVEN® does not require stirring, freeing up time for income generation and other more productive activities.

The use of SUN OVENS® can dramatically improve the quality of life for women and girls.