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Here’s what happens to your Solar PV when the sun goes down

Will my Solar PV System work at night and on cloudy days?

Solar panels require sunlight to generate electricity for your home so they do not work in darkness. Therefore, it is important to consider solar storage, which allows your solar panel system to access electricity overnight when solar panel production is dormant, either through connection to the electric grid or to a battery. With a grid connections or solar energy storage, solar panels are a sustainable round-the-clock energy solution.

What happens with my Solar PV system during power outage?

Grid connected PV systems are designed to shutdown to prevent back-feeding electricity into de-energized powerlines. The purpose of this is to protect line workers or electricians who may be trying to make repairs to the grid. This is imperative for all grid-tie systems. For those who want to have some critical power for things like freezers, lights, appliances or water pumps during an outage, changes can be made to the system to accommodate those loads

Do you have any questions about Solar energy?  Talk to our experts

What are the benefits of co-locating solar and crop production?

There are different benefits of co-locating solar and crop production for solar energy developers and farmers.

Benefits to solar developers include:

  • Reduced installation costs – The use of previously tilled agricultural may prevent the need for expensive grading to flatten land to a usable level.
  • Reduced upfront risk – Geotechnical risks can increase the cost of solar installation due to increased testing needs. Previously tilled agricultural land was identified as the “least risk option” during a series of surveys with solar installers.
  • Reduced legal risk – By using previously disturbed land, solar installers can reduce the risk of up front litigation during the environmental review process.
  • Potential increase PV performance – Vegetation under modules can contribute to lower soil temperatures and increase solar performance.

Benefits to agricultural land managers include: 

  • Reduced electricity costs
  • Diversification of the revenue stream
  • Increased ability to install high-value, shade- resistant crops for new markets
  • Marketing opportunity to sustainability-mindful audience
  • Ability to maintain crop production during solar generation
  • Allow for nutrient and land recharge of degraded lands.
  • Potential for water use reduction
  • Potential to extend growing seasons

 

Battery Maintenance Tips

Taking good care of your Solar Batteries is one of the best ways to improve battery performance, increase battery life and decrease the lifetime cost of your off-grid solar energy system.

Here are some of the maintenance tips to extend the Battery life of your Solar System

  1. Protect your Solar battery bank from extreme temperatures. Extreme temperatures may cause your solar batteries to malfunction and stop working. Therefore, to prolong the lifespan of your battery bank, ensure that you keep it from extreme heat or cold.
  2. Conduct regular inspections for your solar battery bank. Checking your battery bank regularly will enable you detect potentially threatening conditions thus saving you from unexpected expenses.
  3. Checking the fluid level. This only applies for unsealed batteries (FLA)–these are the flooded lead acid batteries. Open your battery cap and look inside. Add distilled water into the cells so that no metal lead surfaces are visible.
  4. Check also for leakage and corrosion on or near the terminals and cables. Finally, feel around for hot spots. One battery may feel warmer than the others, or the lugs at the cable ends could fail and get hot.
  5. Keep your Solar batteries charged. Keeping your Solar batteries in the discharged state for a long period may affect the capacity and lifetime of your battery bank. Ensure that you completely charge your solar batteries every month to reduce internal corrosion and degradation

Upgrading your Off-Grid Solar System? Here’s what you need to know

Your Solar energy system may not have been sized to accommodate heavy usage or your energy consumption may have increased. The good news is your off-grid or stand-alone solar system can be upgraded to fully cater for your energy needs

When can your Off-grid system be upgraded?

  1. Increased Energy Consumption: Your household or business energy usage can grow due to addition of new electrical appliances, or simply increase in the number of people in your home. This may call for the need to expand your existing solar system to cater for the increase
  2. Underperforming System: If this is the case, it’s time to contact your original installer. If your system is still under warranty (most warranties are 20 years) and the issues with the system are legitimate under the warranty, then you should not need to pay for a replacement. You may, however, decide after your system has been fixed that you still want to upgrade, which will then put you in the two below scenarios.
  3. The solar system is performing well but you wan to increase its size. If your current system’s inverter has the capacity to add more panels and your roof has the space to cater for additional panels, this will be your best option to increase your generated energy. This will cost less than if you were to upgrade your inverter or install an additional solar system
  4. The Solar system is performing well, you have excess energy and want to add battery storage. Adding a battery to your system will allow you to store any excess energy generated from your system, for you to use when your system is not generating energy (when the suns not out). For a battery to be useful and store excess power your current solar system must be generating more energy than you are consuming daily.

Here’s how your Off-grid system can be upgraded

An Off-grid system can be upgraded by adding panels, inverters and battery

Adding battery to your existing Solar System

Adding battery to an existing grid-tied solar system depends on whether or not your system was designed with the intention to do so.

  1. Storage-Ready Solar System. Because installing solar is quite expensive, some people usually start out small with an intention of expanding the system in future.
  2. DC Coupled System: With a DC Coupled System, your inverter will be replaced by one that works with a battery and a solar system.  These are known as hybrid inverters. DC power produced by your solar panels is used to charge the battery. From there, the power is passed through the hybrid inverter, which converts the power into AC electricity.  Then, the AC power can be either used in your home or business or go to the grid.

 

DC Coupling could be a great option for you if you’ve had your solar system for some time and your inverter is approaching the end of its expected life.  Most string inverters last fifteen years, so replacing your inverter a little earlier with one that works with a battery could be to your benefit.

  1. AC Coupled System: The next option, an AC Coupled System, uses your traditional inverter in addition to a second inverter, or a “storage inverter,” that charges the battery.  DC power produced by your panels goes to the inverter and is converted to AC power as it always has. From there, the inverter sends it to your building if you’re using electricity, to your battery if you’re producing more electricity than you’re using, or to the grid if your battery is fully charged. Typically easier to install, AC Coupling offers flexibility in terms of location, works with a variety of inverters, and is likely to be a lower-cost option.  However, it is slightly less efficient. Electricity stored on the grid and used in your home is AC, but batteries store DC power. For the battery to provide power you can use in your home or business, it must then be converted to AC power.  This extra step causes more energy to be lost compared to DC Coupling.

Adding Solar Panels to an existing Solar system

It is important to note how many additional solar panels will be required as this affects the system design and the cost for the upgrade. We can carry out an assessment to be able to determine how many additional panels you will need given your current energy consumption situation

What to consider before adding Solar Panels to your existing system

  1. Unshaded space on your roof for rooftop solar or large space on your property for additional panels to be mounted on the ground
  2. Solar Panel compatibility. It is important to install the same type as the original array if possible. This ensures everything will match, and has the same power outputs and efficiencies as the rest of the panels. However, if you are unable to install the exact panels, lookout for panels with similar power output to avoid damaging the existing array

Inverter replacement

Depending on how much more new capacity you add onto your system, you may need to replace your inverter. When an installer sizes your central inverter, it’s based on the power output of your panels. Because the direct current (DC) electricity being produced by your panels is being converted to alternating current (AC) at the inverter, the power rating of that inverter can be a bit smaller than the panels because of the energy loss that occurs during the conversion process. If you’re adding quite a few panels and your entire solar panel system is much larger than the original size, it may generate more electricity than your pre-existing inverter can handle.

Add-on projects are a bit easier if your original solar panel system uses microinverters as opposed to a power optimizer or string inverter system. Because microinverters are located at each individual panel, you don’t have to worry about inverter capacity issues and can just install additional microinverters with the new panels.

Looking to expand your Solar Power System, we can assist you make the right decision for your home or business with the most viable of the available options after a critical and professional assessment of your situation

 

Ref: Solar Market

Solar Panel Efficiency: what you need to know !

Solar panel efficiency is a measurement of a solar panel’s ability to convert sunlight into usable electricity. Given the same amount of sunlight shining for the same duration of time on two solar panels with different efficiency ratings, the more efficient panel will produce more electricity than the less efficient panel. Solar panel efficiency is determined by the production of electricity by solar cells, which is in turn influenced by the cells’ composition, electrical configuration, surrounding components, and more.

How efficient are solar panels?

Most solar panels are between 15% and 20% efficient, with outliers on either side of the range. High-quality solar panels can exceed 22% efficiency in some cases (and almost reach 23%!), but the majority of photovoltaic panels available are not above 20% efficiency.

How solar panel efficiency differs by product

Given the same amount of sunlight shining for the same duration of time on two solar panels with different efficiency ratings, the more efficient panel will produce more electricity than the less efficient panel. Solar panel efficiency is determined by the production of electricity by solar cells, which are in turn influenced by composition, electrical configuration, surrounding components, and more.

In practical terms, for two solar panels of the same physical size, if one has a 21% efficiency rating and the other has a 14% efficiency rating, the 21% efficient panel will produce 50% more kilowatt-hours (kWh) of electricity under the same conditions as the 14% efficient panel. Thus, maximizing energy use and bill savings is heavily reliant on having top-tier solar panel efficiency.

What determines solar panel efficiency?

There are several factors that determine how efficient a solar panel is. At its core, solar panel efficiency is determined by how much incoming sunlight the solar panel can convert into usable electricity. But what factors into that end conversion rate? There are several items that solar cell researchers and manufacturers consider when designing and producing efficient solar panels:

  • Material – the type of material (monocrystalline silicon, polycrystalline silicon, cadmium telluride, etc.) impacts how light converts to electricity
  • Wiring and busing – the organization of wires and “busbars” on a solar panel that actually capture and transfer electricity impacts efficiency
  • Reflection – if light is reflected away from a solar panel, it’s efficiency may be lowered. This is why the glass layer on top of silicon solar cells is so important.

Additionally, factors like being able to absorb light on both sides of a cell (bifacial solar panels) and being able to absorb variable wavelengths of light (multijunction solar pan.0els) change the efficiency equation for solar panels. All in all, there are a multitude of levers that scientists and researchers can pull when working on improving solar panel efficiency. In the end, it’s all about converting more incoming sunlight into electricity.

Can I Add Batteries to Your Existing Solar System? YES

For years, batteries have been a way to store excess power for solar systems.  But until recently, due to their high cost and low efficiencies, they only made sense for few, mostly off-grid solar systems.  However, as battery prices continue to decline and batteries themselves become more and more effective, they are growing into a viable option for many grid-tied solar systems as well.

If you installed your system a few years ago, batteries may not have made sense.  But as the market changes and technology advances, you may find yourself wishing you could take advantage of energy storage.

If you’re wondering whether or not you can install batteries in your existing solar system, the answer is yes!  There are several ways you can integrate battery power into your existing solar system.

How Do Solar Batteries Work?

Before we get into your options for adding batteries onto your system, we want to quickly go over how batteries work.

As the sun shines, your solar panels collect the energy and turn it into DC electricity. The electricity is then sent to your inverter, which converts that power into AC electricity – the form you can use in your home or business.  As your system produces energy, it’s used to power your lights, appliances, and devices. But what happens when your system produces more electricity than you use?

If you install a battery, here’s where it would come in.  When you’re using more electricity than your solar system is producing, you can draw on energy stored in a battery, instead of drawing it from the grid.

Adding a Battery to Your Existing Solar System

In most cases, adding a battery to an existing grid-tied solar system is possible, however, the level of difficulty is dependent on whether or not your system was designed with the intention to do so.  Here are the ways to install a battery in your existing solar system.

Storage-Ready Solar System

Best-case scenario, you knew you’d eventually want to install batteries and planned for it when having your system installed.  Maybe you were waiting for prices to drop or wanted to keep the upfront investment during installation as low as possible. Either way, you prepared yourself for the future.  Your inverter is ready for the installation of a battery when it makes financial sense to you. This is the cheapest and easiest option, requiring less labor and materials than the other two options.

If you did not install a storage-ready system, there are two main ways to integrate your battery into your system – DC Coupled and AC Coupled.

DC Coupled System

With a DC Coupled System, your inverter will be replaced by one that works with a battery and a solar system.  These are known as hybrid inverters. DC power produced by your solar panels is used to charge the battery. From there, the power is passed through the hybrid inverter, which converts the power into AC electricity.  Then, the AC power can be either used in your home or business or go to the grid.

DC Coupling Battery

 

If you go this route, your system will lose less of the energy produced by your panels during the conversion process.  This is because power is only going from DC to AC, whereas in an AC Coupled System (explained next), all energy stored in the battery goes from AC to DC (to charge the battery) and back to AC again.  However, this option will likely cost more upfront due to the cost of the inverter and more involved labor.

DC Coupling could be a great option for you if you’ve had your solar system for some time and your inverter is approaching the end of its expected life.  Most string inverters last fifteen years, so replacing your inverter a little earlier with one that works with a battery could be to your benefit.

AC Coupled System

The next option, an AC Coupled System, uses your traditional inverter in addition to a second inverter, or a “storage inverter,” that charges the battery.  DC power produced by your panels goes to the inverter and is converted to AC power as it always has. From there, the inverter sends it to your building if you’re using electricity, to your battery if you’re producing more electricity than you’re using, or to the grid if your battery is fully charged.

DC Coupling Battery

Typically easier to install, AC Coupling offers flexibility in terms of location, works with a variety of inverters, and is likely to be a lower-cost option.  However, it is slightly less efficient. Electricity stored on the grid and used in your home is AC, but batteries store DC power. For the battery to provide power you can use in your home or business, it must then be converted to AC power.  This extra step causes more energy to be lost compared to DC Coupling.

Source: https://www.paradisesolarenergy.com

Myth-busters: solar energy

Solar power is amongst these often maligned energy sources, with numerous misconceptions about how it works. Never fear, All in Trade myth-busters are here to help clear up three of the top myths about solar:

Myth 1: Solar only works when the sun is out

A common misconception about solar energy is that it only works when the sun is out. In fact, the sun’s ultraviolet light is all that solar power needs to create energy. Solar panels will create heaps of the stuff during foggy and overcast days too, as the UV light still manages to shine through. Perhaps surprisingly, solar panels are actually more efficient at cooler temperatures than hot ones. Take Germany for example:  not a traditional destination for sun-seekers. Yet back in June of 2014, more than 50% of Germany’s electricity demand was met by 23.1 gigawatts of solar power– which was half of the entire world’s production at the time. Germany is set to continue holding one of the top spots for solar production globally – it hasn’t let a cloudy day get in the way.

Myth 2: Solar panels can’t withstand extreme weather conditions

It snows, its rains, it hails; can solar panels withstand all of that? Solar panels are sturdy and made to last a long time in various weather conditions. American solar panel manufacturer Solar World conduct tough tests to make sure the panels are ready for the world. The company starts by dropping half a kilo, 2.54cm steel balls onto solar panels from a height of 4.2 metres. This process is repeated up to 20 times in the same place on at least 11 different points of impacts. They then drop heavy or hard objects on to the panel to ensure stability and break-resistance – including a 45kg lead-filled sack from a height of 1.2 metres right into the middle of the panel! After this, the solar panels are put into a climate room which emulate 25 years of weather changes. In the chamber, the panels manage to withstand temperatures as low as -40°c to as high as 85°c.  They may sound like torture from the middle ages but these tests are needed to make sure solar panels survive in various environments.

Myth 3: Using solar energy is too expensive, I’ll never get my investment back

Throughout Europe, there are misconceptions about how much solar panels cost and the return on investment. UK based solar power comparison site, The Eco Website, states that 2/3 of consumers don’t know how much solar panels cost. The cost of panels has actually been tumbling and is set to continue this downward spiral.  Oxford University researchers found that, since the 1980s, panels have gotten 10% cheaper each year and this is likely to continue. Falling solar power costs mean that in 2016 the typical return on investment for solar panels is 4.8% over 20 years. Not only are solar panels getting cheaper but they can also be a nice little earner, which means better summer holidays for all.

 

Source: https://social-innovation.hitachi

Grid Tied Vs Off grid Solar

Grid Tied Solar System

What is a Grid Tied Solar System?

A Grid Tied also called On-grid Solar system is one that’s connected to the public electricity grid, does not need batteries and uses either solar inverters or micro-inverters. During solar power generation, the excess power produced is exported to the grid. At night, when your solar system does not produce electricity, your home draws electricity from the grid

Pros

Reduction in monthly electricity bills since you are still connected to the grid

Cons

You are still prone to power blackouts. This is because on grid systems are unable to generate electricity during a blackout due to safety reasons

Note: For on-grid systems, battery backup can be added to the system at a later stage if needed.

Off grid Solar System

What is a Grid Tied Solar System?

An off-grid also known as Standalone Solar system is not connected to the electricity grid. Therefore, the excess electricity is stored in a battery from where you draw your power at night when the solar panel is producing less electricity. Off-grid solar systems must be designed appropriately to generate enough power throughout the year and have enough battery capacity to meet the home’s requirements.

Off grid systems are usually the best option for remote areas since the cost of extending the public grid is extremely highly

Pros

With or without the public grid, the off-grid system can power your property at all times

If you want to achieve energy independence, Off grid systems are the way to go

Cons

It is more expensive since it requires addition of batteries for backup

Basically, grid-tied systems store energy in the power grid, while off-grid systems store energy in batteries.

Rooftop Solar Vs Ground Mount Solar

Roof top solar or Ground mount solar? Which is the best for me?

Solar Panel Installations can be done in different ways depending on various factors. At All in Trade Limited, we install Roof top solar systems and Ground mount solar systems. Both options are good. All you have to do is choose the option that meets your specific requirements

What is a Roof top Solar Photovoltaic (PV) System?

Roof top solar is a system of solar panels placed on top of roofs of commercial, institutional or residential buildings to capture the light energy emitted by the sun and convert it into electrical energy.

Pros of Rooftop Solar Systems

  • The energy produced is clean and environmentally friendly
  • Utilizes space that otherwise wouldn’t be
  • Does not require a large property to be installed on since it’s on the rooftop
  • Lower installation costs
  • Can shield your roof from certain elements
  • Adds value to your property

Cons of Rooftop Solar Systems

  • If your roof is old, you may require a new one before installation
  • Not suitable for shaded roofs

What is a Ground mounted Solar PV System?

A Ground mounted solar PV system is a system of solar panels that are mounted on the ground on your property, rather than on the roof of your house. These to capture the light energy emitted by the sun and convert it into electrical energy. The difference is that they are installed on the ground, in open space rather than on top of your roof.

Pros of Ground Mount Solar System

  • The energy produced is clean and environmentally friendly
  • Can be installed to face any direction
  • Requires no modification to the house structure
  • Easy to access in case of maintenance
  • Can install a fairly large system if you have plenty of space
  • The property on which the panels are installed can be used for other activities such as farming

Cons of Ground Mount Solar System

  • It may require large property
  • Higher Installation costs

Rooftop or Ground Mount Solar?

Roof Top solar is the commonest type of solar installation for home owners or businesses choosing to go solar. However, ground mount solar is equally good and can provide a number of advantages over rooftop solar.

If you have plenty of unshaded roof space, rooftop solar installation is likely going to be the best, cheapest option. If your available roof space is limited but have plenty of unshaded property, a ground mount system might be suitable

Wondering which type of Solar installation is best for you, always work with a qualified installer to assess the condition of your property and hep you make an informed decision

Solar Powered Water Pumps! What you should know

Solar Powered Water Pumps

What is a Solar Powered Water Pump

A Solar water pump is an electrical pump in which electricity is generated by Solar PV systems. Solar water pumps are environmentally friendly because they are powered by the sun.

Application

Solar Water Pumps meet a broad range of needs including crop irrigation, livestock watering and domestic use.

Types of Solar Water Pumps

There are two types of Solar Water pumps namely the Submersible water pumps and Surface water pumps

Submersible Solar/DC Pumps

Lift up to 650 feet and fit in a 4″ or larger well casing. Submersible solar pumps are used when the water supply is more than 20 feet from the surface. They can operate directly off solar panels, batteries or in some cases an AC power source.

Surface Solar/DC Pumps

Good for applications with shallow wells, ponds, streams or storage tanks. Best if water supply is 20 feet or less from the surface. Used primarily for solar water heating applications. These solar pumps run directly from a small solar panel. No battery required.

Sizing and designing a Solar Water Pumping System

This depends on a number of factors including;

  • How much water you need
  • When you need the water
  • Is your water source a stream, pond spring or well?
  • Water available in gallons per minute
  • Depth of the well
  • How far the water needs to be pumped and with what elevation gain
  • Water quality problems like silt or high mineral content that may damage the pump
  • How much volume is available in storage tanks and how the tanks are arranged

Advantages of Solar Water Pumps

  • Solar water pumps are environmentally friendly since they are powered by the sun
  • Because they are powered by the sun, they work perfectly in remote areas where there’s no access to the national grid
  • You don’t need to pay a ton of money each time you use your solar water pump. There are no cumulative electricity bills since the system is powered by the sun
  • Solar water pumps as easier to maintain compared to conventional pumps.
  • Solar water pumps work efficiently while saving you a ton of money.

 

Which Type of Solar Water Pump is suitable for me?

The type of solar water pumping system you need will depend on the water source. If the source is a borehole (proposed or existing) or deep well, then a submersible pump that fits the borehole or well will be suitable. If the water source is a river, then a surface pump is recommended. If the water resource is a shallow well, pond or lake, then either a surface or floating pump may be selected.

An All In Trade expert system designer can help you select the suitable Solar Water Pumping System during the site visit.

Need a  Solar Powered Water Pump? Talk to our experienced Solar Experts to get started

 

 

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