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Vietnam uses solar energy equipment for direct sales
The Vietnamese Government has announced a decision to authorize rooftop solar, biomass, and waste-to-energy projects to engage in direct power sales, bypassing the Electricity of Vietnam (EVN).
FAQs about Vietnam uses solar energy equipment for direct sales
What is the solar power industry in Vietnam?
Solar power industry. The potential for solar energy in Vietnam is between 60 and 100 GWh per year for concentrated solar power, while for photovoltaic (PV) systems, it is around 0.8 to 1.2 GWH per year.
What is the cost of solar electricity in Vietnam?
Last year, Vietnam had a solar LCOE (Levelized Cost of Energy) of $0.046 per kWh for solar electricity. The cost in the United States was $0.055 per unit of power, and in Turkey it was $0.064.
What is the potential for solar energy in Vietnam?
The potential for solar energy in Vietnam is between 60 and 100 GWh per year for concentrated solar power, while for photovoltaic (PV) systems, it is around 0.8 to 1.2 GWH per year. With around 1,600 to 2,700 hours of sunlight per year and an average direct normal irradiance (DNI) of 4-5 kWh/m2, the country has huge potential for solar power.
How will Vietnam's solar power market change over the next 5 years?
Mordor Intelligence, a market research and advisory firm, projects that Vietnam's energy demand will increase by 10 percent annually over the next five years, which means the required power capacity will also need to double. Consequently, the solar power market will be crucial in addressing this substantial energy demand.
Why should foreign investors invest in solar energy in Vietnam?
Vietnam's solar energy market, driven by high solar potential and strong government support, plays a key role in the country's “Net Zero” commitment, among other fields of green energy. For foreign investors, this presents a golden opportunity to tap into a rapidly growing sector with sustainable impacts.
How many rooftop solar projects are there in Vietnam?
Vietnam currently has approximately 103,000 rooftop solar power projects across residential, commercial, and industrial buildings, boasting a total installed capacity of over 9,500 MW. By 2030, Vietnam aims to significantly increase its solar capacity, projecting that 50 percent of households will have rooftop solar installations.
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Solar Sales Price Range
The average cost of solar panels in the UK, including installation and a battery, ranges between £6,200 and £12,000 depending on the size of your household.
FAQs about Solar Sales Price Range
How much do solar panels cost?
Monocrystalline solar panels are the most expensive, and their cost per kW is somewhere around £1,000 – £1,500 whereas polycrystalline solar panels cost about £900 per kW. When it comes to thin-film solar panels, these cost between £400 and £800 per kW. 1.
How much do solar panels cost in 2023?
They vary in price based on their wattage, size, use case, and panel type. One of the most common sizes in 2023 for a household in the UK is a 4kW solar panel system. The 4kW solar panel system costs between £6,000 and £7,000, requires around 16 panels and covers approximately 29 square metres of your roof.
How much will 10 solar panels cost in the UK?
The cost of 10 solar panels in the UK can vary based on several factors, including the type of panels and the brand you choose. Depending on the size of the solar panels, it will cost between £5,000 to £6,000 to install 10 solar panels, not taking into account labour costs.
How much does a solar battery cost?
As the average cost of a solar battery for a three-bedroom house is £4,500, it means you could pay £9,000, or more for batteries over the lifespan of your solar panels. The average package 3kW or 4kW solar panel system with battery, usually comes with a 4kW to 14kW battery.
How much does a 4KW Solar System cost?
The 4kW solar panel system costs between £6,000 and £7,000, requires around 16 panels and covers approximately 29 square metres of your roof. A 3kW system, often used for households of two to three, costs between £3,000 and £5,000, needs around 12 panels and takes up about 22 square metres of roof space.
How do I compare solar panel prices & quotes?
Here you can easily compare solar panel prices and quotes and find the lowest-cost panels. Simply type your postcode into the box below and select one or many local and national, trusted solar panel installers and ask them for a quotation. Using this feature will help ensure you get the best price possible and is designed to save you money.
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How to change the voltage parameters of solar panels
What is VOC? VOC is the maximum voltage of an open circuit produced by a solar panel. Open Circuit Voltage (VOC) and is a product of the forward biases of the solar cell. You cannot go by the volts rating on the solar panel box because a 12v solar panel will produce as much as 18v-22v. However, you can use a. The first thing to do is double-check your calculations before you buy solar panels and your solar regulator. Your goal is to keep the voltage from the panels at 2/3s of the average maxim voltage of the controller. For example, if. A VOC solar charge controller is a device that limits the amount of energy that passes through it. We often see these in solar array systems where a solar battery storage system is in place. They are sometimes called step.
FAQs about How to change the voltage parameters of solar panels
How do I change the voltage on my solar charge controller?
You can do this by adjusting the voltage setting of the charge controller. The voltage setting determines how fast your solar cells can recharge. You can change these settings Via PC software, or on your charge controller. It is recommended that you follow the manufacturer's recommendations to get the most from your solar energy system.
Can you reduce solar panel voltage?
And that would cause problems. So can you reduce your solar panel voltage? The easiest way you can reduce your Solar Panel's Voltage is by using either an MPPT Charge Controller or a Step-Down Converter (aka Buck Converter). Other solutions are to use resistors or modify the solar cells' connections via the junction box.
How do I use a solar charge controller?
While solar panels can be connected in parallel to provide maximum output voltage, a basic charge controller may only accommodate a maximum input voltage of 12 or 24 volts. To use a solar charge controller, you need to set the voltage and current parameters. You can do this by adjusting the voltage setting of the charge controller.
How do solar panels increase voltage?
The overall system voltage is increased by connecting solar panels in series. When a grid-connected inverter or charge controller requires 24 volts or more, solar panels in series are typically employed. Solar cells are comprised of silicon that has been carefully processed to absorb as much light as possible.
What is a solar system voltage?
Generally, the system voltage is 12V, 24V or 48V. The system voltage value can be 110V and 220V for medium or large charge controllers. The maximum charging current refers to the maximum output current of solar panels or solar array.
What is the voltage output of a solar panel?
In solar photovoltaic (PV) systems, the voltage output of the PV panels typically falls in the range of 12 to 24 volts. However, the total voltage output of the solar panel array can vary based on the number of modules connected in series.
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RV solar panels can be mixed
As we said above, when connecting solar panels in series, we get an increased wattage in combination with a higher voltage. Such 'higher voltage' means that series connection is more often applied in grid-tied solar systemswhere: 1) the system voltage is often at least 24 volts, and 2) the solar array output voltage is. Here is a series connection of solar panels of different voltage ratings and the same current rating: You can see that if one of the solar panels has a lower voltage rating (and the same current. The next basic type of connecting solar panels is in parallel. Connecting solar panels in parallel is just the opposite of series connection and is used to increase the total output current of. A combination of series and parallel connection is also possible. Indeed, this depends on the maximum possible total output voltage and maximum possible total output current of the solar. Here is a parallel connection of solar panels of different voltage ratings and the same current rating: As you can see, things are getting worse, since the total voltage of the array is.
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FAQs about RV solar panels can be mixed
Can you add solar panels to your RV?
Adding more solar panels to your existing system is the solution you've been looking for. You can easily increase your RV's energy production with portable solar panels. And if you're concerned about your roof space, rooftop solar panels are a great option, too.
Can you mix different solar panels?
Mixing solar panels of various voltage or wattage, or produced by different manufacturers, is a frequently asked question by most DIYers. Though mixing different solar panels is not recommended, it's not forbidden and things would be ok as long as each panel's electrical parameters (voltage, wattage, amps) are carefully considered.
How do you mix solar panels?
If you have to mix panels, try to closely match their wattages, voltages, and currents. Minimize or eliminate power loss with mixed solar panels by matching each panel's electrical characteristics and using the optimum configuration. When connecting multiple solar panels, how they're configured significantly influences their performance. parallel.
Can you combine mismatched solar panels to get the most power?
Today, we're tackling a common problem for solar users, especially those with RVs or trailers with limited roof space: how to combine mismatched solar panels to get the most power output. Now, this isn't as simple as plugging everything together in series and adding up the wattage—there's more you need to consider. So, let's take By.
Are solar panels a good idea for your RV?
Solar panels provide many benefits, such as reducing reliance on campsite electrical hookups, silent power generation, and minimizing generator fuel costs. Additionally, adding more panels can boost your solar energy production, which allows for an extended boondocking experience, better battery life, and increased RVing freedom.
Can you mix rigid and flexible solar panels?
You absolutely can mix rigid and flexible solar panels! In fact, we've done just that in the ultimate RV solar panel system on our motorhome. There are, of course, advantages and disadvantages to flexible solar panels vs rigid, and for us, a combination of both has proven to be a winning approach.
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Why does the solar panel suddenly stop generating electricity
If your panels aren't producing any electricity when you'd expect them to, it's most likely a fault with the inverter or problem with the wiring. Occasionally the generation meter might fail.
FAQs about Why does the solar panel suddenly stop generating electricity
Why are my solar panels not producing electricity?
Trusted Trader Elltec Energy Services. If your panels aren't producing any electricity when you'd expect them to, it's most likely a fault with the inverter or problem with the wiring. Occasionally the generation meter might fail. If this happens, you'd see no recorded generation, even though the system is working.
What causes a faulty solar panel system?
Probably the most common issue found on faulty solar panel systems isn't actually the panels themselves - it's all down to the inverter. The inverter converts the direct current (DC) generated by the panels into alternating current (AC), which powers the electrical components around your home.
Do solar panels stop working unexpectedly?
Solar panels are incredibly low maintenance and if they're installed correctly, they are unlikely to stop working unexpectedly. But that doesn't mean you'll never run into an issue with your system. Solar energy systems are comprised of several electrical components, all of which can experience issues.
What causes low power output in solar panels?
The most common cause of low power output in solar panels is obstructions or shadows on the array. Checking Voc (voltage open circuit) and Isc (current short circuit) measurements can help diagnose panel issues. Loose connectors and improperly seated terminals can cause low voltage or current output.
Why is my solar array losing power?
A Loose Wire On Your Panel Array If you are experiencing a significant loss of power this may be caused by a loose wire on your PV system which means that your solar array cannot connect the energy it's generating to your inverter system. Ensure that you call your installer to do this for you as live wires can be dangerous.
Why do solar panels lose energy?
A sudden drop in energy production, for instance, could indicate an obstruction or a technical fault. It's about being proactive rather than reactive, ensuring your solar panels continue to provide clean, efficient energy to your home. Like any valuable asset, a little care goes a long way.
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How about opening a solar power store
In this article, we'll guide you through 9 essential steps to launch your solar power business, including a comprehensive checklist to ensure nothing is overlooked. Curious about the details?.
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Track solar panels
Ground mounted solar installations can use solar trackers to tilt the angle of solar panelsthroughout the day, maximising generation. They are typically used in large scale commercial or utility projects - not reside. With a static system, sunlight hits the panel at a varying angle - called the angle of incidence - throughout the day. The narrower the angle of incidence, the higher the output. So wit. A single axis systemmoves the panels through one range of motion. The axis is typically oriented north-south, so the solar panels can tilt east through west as the sun rises and sets. A. Let's compare the output of an optimised single axis tracking system to a fixed system in London (both 10kWp): As you can see, there is one point around midday when the static s. Overall, you can achieve an average output increase of 20-25%with a single axis tracker. With a dual axis tracker, expected increase is another 5-10% on top of that, but this rarely jus.
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FAQs about Track solar panels
What is a solar tracking system?
A solar panel precisely perpendicular to the sun produces more power than one not aligned. The main application of solar tracking system is to position solar photovoltaic (PV) panels towards the Sun. Most commonly they are used with mirrors to redirect sunlight on the panels.
How do solar trackers work?
This system is commonly used to position solar photovoltaic panels perpendicular to the Sun. You're familiar with PV panels, but do you know about solar trackers? Though less known, they play a vital role in solar energy. They ensure that the panel consistently faces the sun, optimizing sunlight exposure.
How to choose a solar tracker?
You need to consider factors like climate, space, and shading before deciding on solar tracking. These tracking systems offer the most benefits in locations with high latitudes due to the sun's yearly movements. In conclusion, positioning a solar tracker directs the solar panels at an angle toward the sun.
What are the applications of solar tracking system?
The main application of solar tracking system is to position solar photovoltaic (PV) panels towards the Sun. Most commonly they are used with mirrors to redirect sunlight on the panels. Cross-Reference: Design and Implementation of High Efficiency Tracking System
Can solar trackers be used with roof-mounted solar panels?
Solar trackers are usually designed to be used with ground-mounted solar arrays, yet in recent years a few solar trackers have been released that are designed to be used with roof-mounted solar panels too.
What are the different types of solar tracking systems?
There are two types of solar tracking systems based on their movement: single-axis and dual-axis. A single-axis tracker moves your panels on one axis of movement, usually aligned with north and south.
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6v solar panels in series
To wire your solar panels in series, simply link the positive MC4 connector of the first solar panel to the negative MC4 connector of the next one, and continue this pattern for the remaining panels.
FAQs about 6v solar panels in series
How many volts does a 6 panel solar array use?
The above diagram shows a six-panel array using 5 Amp, 20 Volt panels wired in a series-parallel configuration of 3-panel series strings wired in parallel (3s2p). First, we need to find the volts and amps of the series wired strings of solar panels.
How many volts are in a series solar panel?
This diagram shows three, 4 amp, 24-volt panels wired in series. Since series wired solar panels get their voltages added while their amps stay the same, we add 24V + 24V + 24V to show the total array voltage of 72 Volts while the Amps remain at 4 Amps. This means there are 4 Amps at 72 Volts coming into the solar charge controller.
How many solar panels are connected in a series?
A set of two solar panels connected in series Series Voltage: V1 + V2 .. + Vn 12V + 12V = 24V. (Voltage is additive in series connection) Series Current: I1 = I2 .. = In 10A = 10A = 10Ah (Current is same in series connection). Now, we have two sets of series connected solar panels. If we connect these two set in parallel: Parallel Voltage:
How many volts does a 4 panel solar array use?
Finally, you wire the 2 series strings in parallel to create a 4-panel solar array with a voltage of 28 volts (the lowest voltage rating of the 2 strings) and a current of 11 amps (6A + 5A).
How many Watts Does a pair of solar panels generate?
After wiring our two panels in parallel, we manage to generate around 555-560 watts of power, a noticeable decrease from our series configuration. Now, let's look at a combination of series and parallel wiring, which allows us to effectively bring together four panels. We start by wiring two sets of panels in series.
Can a 12V solar panel be connected parallel?
Only the same rated solar panel can be connected in series, parallel or series parallel connection. A 12V solar panel can only be connected in (series, parallel or series-parallel) with another 12V solar panel. A 12V solar panel should not be connected (in series, parallel or series parallel) to a 6V or 24V solar panel.
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Indoor solar powered charging
Several factors can affect how productive these devices will be when placed in a window. These factors include orientation, reflection and refraction effects, the effects of shading, and temperature. During the nighttime, we light our homes with light bulbs. Is this ambient lighting a suitable source to create electricity in a solar device? Yes – however, several factors affect their. So, what light bulbs can produce the best wavelength and intensity of light that can be used to power a solar panel? Here are a few options for you to consider. The leisure and camping industry has encouraged the development of devices that incorporate solar panels. This simple design also means that they will also function indoors by placing them by a window or exposing them. There are several smallerdevices whose power requirements allow them to function from the power produced by an indoor solar panel: 1. Charging.
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600w solar power system installation
The exact situation for this project is retrofitting solar to an old mobile home that was originally set up for A/C power connected to a public utility grid. Here is an easy Solar System Calculatorfor you to figure out how large your solar system needs to be. One of my neighbors who lives up on the mountain near us lost. This project isn't difficult if you follow along with this step -by step tutorial. I'll rate this project on a 1 thru 10 scale based on skills you may have. 1 is so easy you can do it in your sleep 10 being you.
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Covered solar panels
Solar panel covers protect solar panels during extended periods of inactivity, preventing damage, algae growth, and keeping birds and pests out.
FAQs about Covered solar panels
What is a solar panel protective cover?
Retractable Covers: A retractable solar panel cover can fold over your panels and back when not used. They allow maximum sunlight exposure when sunny but offer protection when the weather changes. Are Solar Panel Protective Covers Effective? Solar panel protective covers can be an effective addition to your solar energy system.
Should you cover solar panels?
Many solar panel protective covers are meant to stop the absorption of solar energy, so the panels will no longer work effectively when the covers are in use. You should only cover your panels when they are not needed. Are There Benefits to Covering Solar Panels?
What are the different types of solar panels covers?
We evaluated and recommended different types of covers based on the client's needs: Grid or Mesh Covers: These covers allow solar panels to continue absorbing sunlight while protecting them from birds and large debris. Solid Covers: Ideal for protecting panels during hailstorms and extended periods of non-use.
How do I choose a solar panel protective cover?
Many solar panel protective covers, like mesh and clear polycarbonate ones, are designed to allow optimal sunlight penetration while providing protection. It's essential to select a cover that suits your region's sunlight conditions. Can I install the protective cover myself, or do I need professional assistance?
What are the benefits of solar panel covers?
Solar panel covers protect solar panels during extended periods of inactivity, preventing damage, algae growth, and keeping birds and pests out. Some covers are designed to prevent energy overload by blocking solar energy absorption during non-use periods. This helps in extending the panel lifespan in the long run. 4. Compatibility
What are solar panel covers made of?
Clear Plastic Covers: These solar panel covers are made from transparent plastic. They allow sunlight to pass through while protecting your panels from dust, bird droppings, and other debris. Reflective Covers: Solar panel covers made from reflective materials are recommended if you live in a scorching hot area.
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Which solar power source in China is the best
is the largest market in the world for both and. China's photovoltaic industry began by making panels for, and transitioned to the manufacture of domestic panels in the late 1990s. After substantial government incentives were introduced in 2011, China's solar power market grew dramatically: the country became the.
FAQs about Which solar power source in China is the best
Is China a good source of solar power?
Since China is responsible for 80% of the world's polysilicon production, with half of the world's polysilicon produced in Xinjiang, many critics of the forced labor usage have stated that it is difficult for many countries to avoid Chinese made solar power solutions.
Is China leading the world in solar power?
Technicians check solar panels in Zhoushan, Zhejiang province. [Photo by YAO FENG/FOR CHINA DAILY] A report by the International Energy Agency, or IEA, on the future of renewable energy production has pinpointed China, and in particular its solar power capabilities, as leading the way for the world in the years to come.
Why is China the world's leading producer of solar panels?
China is the global powerhouse in solar panel manufacturing, driving the industry with unparalleled production capabilities and cutting-edge technological advancements. As the world's leading producer, China commands over 95% of the global market for key components such as polysilicon, ingots, and wafers, essential for solar panel production.
Should China invest in solar energy?
As such, critics argue that investments into renewable energy sources such as solar power are means to increase the power of the central state rather than protect the environment. This argument has been complemented by China's expansion of fossil fuel plants in conjunction with solar energy.
What percentage of China's energy use is solar?
Solar power contributes to a small portion of China's total energy use, accounting for 3.5% of China's total energy capacity in 2020. Chinese President Xi Jinping announced at the 2020 Climate Ambition Summit that China plans to have 1,200 GW of combined solar and wind energy capacity by 2030.
Can China make more solar power?
China can now make more solar power than the rest of the world. Data released by China's National Agency last week revealed that the country's solar electric power generation capacity grew by a staggering 55.2 percent in 2023. The numbers highlight over 216 gigawatts (GW) of solar power China built during the year.
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Solar panel lamination technology
At this moment, the most common way to laminate a solar panel is by using a lamination machine. This old-fashioned method has many disadvantages but is used by the large majority of solar panel manufacturers. PV lamination is a proven concept and works as follows: In order to laminate a solar panel, t. This way of laminating is a proven concept, but it has disadvantages: a lamination machine is large, expensive, and consumes much electricity. Moreover, a lamination machine is slowa. Nowadays there are numerous encapsulants that are most likely going to replace the old-fashioned way of laminating. A company that is a leader in innovation and h.
FAQs about Solar panel lamination technology
Why is solar panel lamination important?
Solar panel lamination is crucial to ensure the longevity of the solar cells of a module. As solar panels are exposed and subject to various climatic impact factors, the encapsulation of the solar cells through lamination is a crucial step in traditional solar PV module manufacturing.
How to laminate solar panels?
As solar panels are exposed and subject to various climatic impact factors, the encapsulation of the solar cells through lamination is a crucial step in traditional solar PV module manufacturing. At this moment, the most common way to laminate a solar panel is by using a lamination machine.
What is solar module lamination?
Solar module lamination is a procedure that involves the placement of solar cells between layers of material with the intention of not only providing protection but also weather resistance to the module. However, this is of utmost importance because it protect the components from the environment, like moisture, dust, and contact stress.
Why is PV module lamination important?
PV module lamination increases the durability of solar panels. By encapsulating the solar cells and connections within a protective material, the panel is shielded from the elements and is less likely to be damaged by environmental factors such as moisture, temperature changes, and physical impact.
Does PV module lamination improve the efficiency of solar panels?
PV module lamination increased the efficiency of solar panels. The protective layer used in lamination is typically made of ethylene vinyl acetate (EVA), a material that has been shown to improve the efficiency of solar panels by up to 2%.
What is a solar panel laminator?
A solar panel laminator is a machine that is used to make solar panels. This machine uses heat and pressure to stick different layers of the photovoltaic module together. The laminator makes sure that the solar cells are sealed within the protective layers of the solar module, creating a strong bond.
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Solar independent grid-connected power station
Stand-alone photovoltaic power systems are independent of the utility grid and may use solar panels only or may be used in conjunction with a diesel generator, a wind turbine or batteries.
FAQs about Solar independent grid-connected power station
What is a grid connected energy system?
A system connected to the utility grid is known as a grid-connected energy system or a grid-connected PV system. Through this grid-tied connection, the system can capture solar energy, transform it into electrical power, and supply it to the homes where various electronic devices can use it.
Do grid connected solar PV inverters increase penetration of solar power?
The different solar PV configurations, international/ national standards and grid codes for grid connected solar PV systems have been highlighted. The state-of-the-art features of multi-functional grid-connected solar PV inverters for increased penetration of solar PV power are examined.
Should solar power be connected to national grid?
Connecting solar power directly to National Grid's transmission network marks a significant step in the renewable energy transition, allowing clean energy to be transported over greater distances and opening a gateway for larger projects to connect to the grid.
Do solar photovoltaics need to be integrated into electrical grids?
Thus, many countries have established new requirements for grid integration of solar photovoltaics to address the issues in stability and security of the power grid. In this paper, a comprehensive study of the recent international grid codes requirement concerning the penetration of PVPPs into electrical grids is provided.
How many kW a grid connected solar system is enough?
For most households, a 1 KW to 10 KW grid-connected PV system is enough. In fact, an average Indian household can very well function on a 3 KW grid-tied solar system. Q. What happens to the on-grid inverter during a power failure? During a power failure, the on-grid inverter disconnects the photovoltaic system from the grid. Q.
How does a grid connected PV system work?
Through this grid-tied connection, the system can capture solar energy, transform it into electrical power, and supply it to the homes where various electronic devices can use it. When the grid-connected PV system is installed on residential or commercial rooftops, it provides solar electricity to all the electrical ports and sockets.
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Why does solar energy create wind
Solar energy causes wind due to it's affect on air pressure. Wind is caused by air pressure gradient, basically air moving from an area of high pressure to low pressure.
FAQs about Why does solar energy create wind
How does solar energy cause wind?
Solar energy causes wind through the process of heating different areas and creating air pressure gradients. According to Gay-Lussac's Law, as heat increases, so does pressure. Consequently, areas that are more heated have higher pressures, leading to air moving from areas of high pressure to low pressure and causing wind.
What is solar wind & how does it work?
What is solar wind? The solar wind is matter that is blown from our sun, out into the whole solar system. This stream of material is coming out of the sun all the time – about a million tonnes per second. It's gusty, and changes with time, but it also comes out at a speed of between one and two million miles per hour.
Why is solar wind constantly released from the Sun?
In this outer atmosphere, temperatures are extremely high, causing plasma to expand so much that it breaks free from solar gravity and is released into space. An artist's illustration of solar wind streaming out from the Sun. The solar wind is constantly released from the Sun's outer atmosphere.
How does the solar wind change over time?
The solar wind varies in density, temperature and speed over time and over solar latitude and longitude. Its particles can escape the Sun's gravity because of their high energy resulting from the high temperature of the corona, which in turn is a result of the coronal magnetic field.
Why do we need solar and wind energy?
By providing clean, renewable, and increasingly affordable energy, they help reduce greenhouse gas emissions, protect natural resources, and support a thriving green economy. While challenges remain, advancements in technology and policy support continue to make solar and wind energy more viable than ever.
How fast does the solar wind travel?
The solar wind travels faster than the speed of sound. During events like solar flares and coronal mass ejections, when larger than normal amounts of solar energy are released from the Sun, the speed of the solar wind increases, reaching speeds of over one million miles per hour.