A new product from Tesla, an electric car company owned by American legendary entrepreneur Allen Musk: The home battery "Powerwall" is a household battery pack that allows you to be in energy It has a higher independence. If you use solar panels or wind power to generate electricity, it is difficult to ensure that you can get stable energy production. And if you use a battery, you can store it during the day and leave it for use at night.
Musk launched an ambitious big plan, even envisioning battery-driven entire America
A home battery will also allow you to get power from the utility company at night when the power company's power load is low and store it for reuse during the day. Whether it's for home users or power companies, it's a win-win situation – you cut your electricity bills, and power companies reduce the load on peak daytime usage.
Of course, household batteries are always available, the most common of which is the lead-acid battery, just like the one used in your car. However, this is not at all simple, you will need to buy a lot of such battery packs and connect them as a whole. And if any of the batteries are damaged, you need to stop and replace them. And such conventional batteries are often expensive and take up a lot of space.
Powerwall seems to turn a household battery into a very common household appliance. It uses a wall-mounted installation method, and you don't have to maintain a single battery pack, so the price of an entire device is about $3,000 to $3,500.
So, can you drive the entire household directly with such a battery? the answer is negative. Because the home appliance uses AC power, and this battery pack outputs DC power. This means you need to first convert DC to AC. In fact, you may have such a conversion device in your car so that you can connect other power-consuming devices, such as computers or coffee makers, to your car. This converter can draw DC power from your battery and convert it to AC, which is then converted to DC. It sounds stupid, but it is a fact.
Tesla launched two products, 7 kWh and 10 kWh. According to the average household's 2 kWh power consumption level, a 10 kWh battery pack will be able to sustain a family's five hours of power consumption. It doesn't seem to be very long for 5 hours, but it is actually enough to solve the problem of electricity use at night, because the power consumption at night is generally less than that during the day. Of course, the efficiency level of 100% is considered here. In fact, the actual battery pack efficiency can only reach about 92%, and there will be some loss in the AC/DC conversion. So if your household's power consumption level is 2 kWh, then assuming 3 hours of use is more realistic.
Another concept is energy density. When it comes to density, you might immediately think of the difference between mass and volume. But this is the mass density, which means the energy stored in a unit volume. This concept is important because the higher the energy density, the smaller and more compact the space you need to store a certain amount of energy.
So what is the energy density of the Powerwall? According to its product introduction, its volume is 130 cm x 86 cm x 18 cm, so its volume is 0.201 cm3, so its energy density is 179 MJ/m3 or 0.179 MJ/L.
So what is the situation compared to the situation? According to the information listed on Wikipedia, the energy density of Powerwall batteries does not seem to be high, because lead-acid batteries can reach an energy density of 0.56 MJ/L. This may be the result of extra space inside the Tesla battery. We can look at another concept, the so-called "mass energy density" (ie the energy corresponding to the unit mass). The power of the Powerwall battery is about 100kg, so the calculated "mass energy density" is about 0.36 MJ/kg, which is equivalent to the level of lithium-ion batteries.
In the introduction of Musk, he showed an ambitious vision: a small part of the United States for solar power. The specific size of the area can be estimated by the national electricity consumption in the United States and the efficiency of solar power generation. Masque claims that batteries that can be used nationwide will occupy only a very small area, so that a small space can store enough electricity for one day in the country.
Tesla also released the "Powerpack", which is basically an industrial-grade Powerwall that can store 100 kWh of electricity. Mask claims that if 160 million Powerpack battery packs are used, it will be possible to power solar power that is entirely dependent on storage in the United States.
Fire Steel Doors ,Fire Steel Doors,Fire Rated Steel Door,Metal Fire Door
Foshan QI'AN Fireproof Shutter Doors Co., Ltd , https://www.fsqianfiredoor.com