The increased investment gives encouraging signs not only for UK manufacturing in the face of the financial crisis but also renewable energy as a means of rejuvenating the struggling economy and generating jobs.

The feed-in tariff system, which came into effect in April this year was devised as a way of attracting investment in renewable energy and has proved successful in countries such as Germany and Spain where tariff payments have offset the initial costs of installing solar plant and offered attractive yields to investors. Sharp Corp have certainly seen an added interest in solar power, reflected by the investment in the manufacturing of essential solar components.

“This time last year 99 per cent of the modules that we manufactured at Wrexham were exported to Europe and that has already dropped to 90 per cent. The feed-in tariff has given confidence to manufacturers like ourselves to invest,” spoke Andrew Lee, General Manager of Sharp Solar.

Indeed, the investment in the UK plant will see four additional production lines taking the capacity of the factory up to 500 mW by 2011. In terms of job creation, the plant which currently employs 750 people is unsure about how many new jobs will be created but green shoots nevertheless for supporters of a low carbon economy.

How do I know if my PV system is working properly? This is a very good question and something that many customers of solar energy systems wonder. The answer is to spend some time and perhaps some money in monitoring the performance of your system over an extended period of time.

Perhaps the first point to mention is that a good installer should do this for you. They should care deeply whether or not their installations perform as well as they will have predicted. Before choosing your installer try to determine what they offer in terms of after sales support and care.

If you like to take matters into your own hands there are a number of ways to monitor your system. If you are not inclined to pay extra for monitoring hardware, the simplest solution is to use information from the displays of the generation meter or the inverter (or both). Both these instruments will be present in all PV systems installed in the UK by a microgeneration certification scheme installer and will be able to tell you the number units of electricity generated since the system was put in. Get into the habit of checking this number at the end of each day, along with a record of what the weather was like – clear sky, partial cloud, heavily overcast etc…

Your installer will have provided you with an estimate of the annual energy production in kWh – in southern England this should be in the region of 850 kWh per kWp). This means that over the course of the year you should expect an average of two and a half kWh of energy each day for every kWp you have installed. This is heavily dependent on the weather of course. On a clear day you could expect 8 kWh, and on a very dark day as little as 0.2 kWh. After several days of checking you should be able to have an idea of whether your system is significantly under-performing.

Over time, your measurements will become more reliable. Each month of the year has an expected solar energy output. Ask your installer for a chart showing the average monthly variation of solar energy for your location. After one month you can compare the energy you got with what you would expect. Be warned however, monthly solar energy output can vary widely, some months can be particularly good or bad for solar compared to normal, so comparing with the average is not necessarily accurate. Still, you should be able to tell if you are getting 30% less energy than you should be.

Getting a more accurate picture of your system’s performance is challenging. For instance, if your system is underperforming by 10%, how do you prove this?

A good method is to compare it to a nearby reference system which is known to perform well, and compare daily production to that. This can be challenging to find however, especially in the UK where there are still very few PV installations.

Another technique is to try to determine if there is something wrong with your system. Your inverter should also tell you the DC voltage and current coming from your solar panels. Under a clear sky, you can check if these values are in line with what they should be from the datasheet. Whether the voltage or current is lower than expected can provide information on what might be wrong.

If your system is underperforming, it could well be because of shading. If shadows are passing across the solar panels during the course of the day that weren’t accounted for in the system design, then this can really contribute to underperformance. Try to get in a position where you can see the solar panels at different times of the day. Any shadows on the module during the middle of the day (when they should be producing the most energy) can be serious. Many systems will be shadowed in the morning or evening, but this is generally less severe. Make sure to also check for dirt or muck on the panels, even small markings can cause big performance losses for solar systems.

It is also worth looking out for long term degradation. Whilst rare, it has been known for systems to get significantly worse over time.

If you would like buy a monitoring solution yourself then the simplest product is a power meter. Examples are the ‘OWL’ meter or the ‘Wattson’ made by DIY Kyoto. These are both simple meters that can easily be installed by clipping a sensor onto the AC output cable of your inverter. What’s useful is that the data can be transmitted wirelessly and viewed in real time and even stored to show you how energy production varies over the course of the day.

Depending on your installer, many will offer to monitor your system for you. This can be advantageous since they will have access to data from a large number of systems on which to benchmark performance. Make sure to ask them exactly how they plan to do this however.

On the upside, most systems should perform fine and are unlikely to go wrong but when you’re investing such a large amount of money in a PV system, its nice to know how to check its working.

 A further $400 Million in Loan Guarantees will be provided to Abound Solar Manufacturing to develop two new solar manufacturing plants. This is expected to create up to 1500 permanent jobs. It is an interesting move away from the Bush era’s pro oil approach. With the BP crisis in the gulf still in full swing Obama will face far less opposition in pushing these loans through. There will also be much stronger public support for renewable energy generally and drop in support for further off shore drilling programmes.

Obama is looking towards renewable energy as not only an investment in the environment but as a new industry to help rebuild America’s fragile economy. By investing in Solar power production Obama is opening a new income steam to the U.S and is also going to be competing directly with China who currently have huge solar panel production capacity.

 As more countries realise the importance of investing in solar energy and solar panel development we are likely to see increases in efficiency and a decrease in technology costs.

This is important for PV systems because the inverter must convert direct
current into mains compatible AC with an acceptable voltage level. Inverters
are also designed to shut down if there is a problem with the grid for
safety reasons.

In Germany, the voltage level is very precise (perhaps as you might expect)
and since Germany is the world’s largest solar market by far, most inverters
in Europe have their settings with Germany in mind. This means that when the
grid strays slightly away from 230V, the inverter temporarily shuts down. In
the UK, the grid is much more likely to deviate from 230V, meaning that with
German settings, an inverter could well spend more time off than on.

Luckily the problem is generally easily fixed by changing the inverter to
new settings which make it tolerant to a wider voltage range. The key point
to remember is that with the inverter shortage, products are being sold
which are completely unchanged from their German settings. This means you
need to be extra vigilent when buying an inverter to ensure compatibility.

A related topic, that I will soon cover, is to do with how lots of solar
energy connected to the grid can actually affect the grid voltage and
frequency – but that’s another issue.

If an inverter is used in the UK without any change in settings then chances
are, with our fluctuating grid, you will have peaks or dips in the voltage
that shut off the inverter from time to time. The solution is simply to
change the settings via the firmware to allow the inverter to carry on
working in a wider range of voltages.

Frost & Sullivan have conducted a study which indicates that the Clegg-Cameron alliance commitment to a low carbon economy could prove beneficial to other struggling industries and in particular, chemicals. The chemical industry plays an important part in the manufacture of new renewable technologies such as solar PV. Frost & Sullivan therefore predict that the growth of the UK solar industry, pushed by the feed-in tariff could help support the chemical industry.

Making comparisons to Germany who introduced their own feed-in tariff system in 2000 in order to incentivise solar investment, Frost & Sullivan believe that the UK feed-in tariff could prove to be a similarly successful catalyst for UK industry as a whole.

Frost & Sullivan Industry Analyst, Dr. Nicola Rudd stated that,

“Increased deployment of photovoltaics has a knock-on effect on the chemical industry as the raw materials, such as solar grade silicon and industrial gases, are supplied by chemical manufacturers. Several of these companies, such as PV Crystalox Solar and Linde, have facilities in the UK and could benefit from this increased local demand for photovoltaics.”

Rudd believes that other areas of UK manufacturing could also benefit from moves towards a low carbon economy. The manufacture of electric and hybrid vehicles in the UK is set to grow, creating jobs and supporting related industries. Rudd believes that,

“The UK is going to be a manufacturing hub for electric vehicles, as demonstrated by Nissan’s announcement that they are going to be manufacturing electric vehicles in Sunderland from 2013.”

The ground-breaking Valencia conference will also bring together the 36^th US IEEE PV specialists conference and the 20^th Asia/Pacific PV science & engineering conference in what is expected to be a massive and unique internationally focused forum for solar energy specialists.

Attendees of the Valencia conference will have the opportunity to meet experts fro around the world and discuss potential developments in the field of solar photovoltaic generation. New trends will be discussed with a keen focus on recent innovations in the science of solar PV. The opportunity for networking, exchanging ideas and perspectives and keeping abreast of international PV developments will provide an exciting prospect for anybody involved in this industry.

With subjects of discussion covering Industry, R&D, Policy, Utilities, Architecture and of course, end users, those involved will get a truly global perspective on all the key issues facing the solar PV market now and in to the future. With side events such as Fora, workshops and technical tours, the 5 day event will be sure to provide a wide array activities.

Programme:

• Plenary lectures focusing on the state-of-the-art and targets of PV
• Oral and poster presentations of specific research, development and demonstration projects, PV applications, 
  PV markets
• Exhibition of PV products and services (6-9 Sept.)
• Fora and workshops on present-day PV issues
• Scientific tours and a social programme

For more information on the 25^th EU PVSEC and 5^th World Conference on Solar Photovoltaic Energy please visit: http://www.photovoltaic-conference.com/

China, despite being criticised for its heavily industrialised, polluting economy and images of Beijing obscured by dense smog during the 2008 Olympic Games, the government is taking proactive steps towards reducing carbon emissions with measures that would shame certain other attendees of the Copenhagen climate summit.

With the growing realisation of the fallibility on basing the huge Chinese economy on fossil fuel imports which could become untenable within the next 25 years, the Beijing government is planning to spend billions of dollars in investing in solar and wind farm sites in addition to research projects which could keep China at the cutting edge of green energy generation.

Renewable energy generation grew by 1 per cent in China in the last 12 months with the government hopeful that figures will grow from the present 9.9 per cent to 15 per cent by 2020. The Chinese government is keen to diversify its economy as well as its means of energy generation with the dual purpose of slowing the effects of climate change and making the economy more robust in the face of any potential fuel crises which could arise in the near future.

In spite of passing legislation designed to have an immediate impact on renewable energy uptake such as the feed-in tariff, a mechanism to incentivise investment in green technologies, government spokesman Zhang Guobao is realistic about the timescales involved in such projects. Speaking to China Daily, Zhang commented that,

“Power projects take a long time to be up and running, and we are basically allowing five years to complete them although it is a 10-year program, otherwise, the facilities cannot be put into use by 2020.”

Zhang added, “It appears that some local governments approved energy-guzzling projects during economic crisis so only by fully implementing our energy saving regulations can we realize economic growth with less energy consumption.”

Shading is a big issue for solar arrays. A small amount of shading on one solar panel can result in a big power loss for the entire system. This is because of how they are connected together; a solar panel is made of a number of solar cells connected in series. Each solar cell has a current of around 8 Amps and a small voltage of 0.6V or so when under full sunlight. For those who remember their physics classes from school, this means that when they are connected in series the voltages add up but the current stays equal. Solar panels are then connected together in series to make a string, so the current still stays the same (on large arrays multiple strings are connected in parallel).

What this means is that if one solar panel, or even one cell of one solar panel is affected, it will affect all the others. When a cell is shaded its output current decreases, which means the current for all the other cells and modules is also limited. So one small patch of shade can disproportionately reduce the power output of the whole system.
This effect can be limited by a number of means.

The best way is to make sure your solar panels are not going to be shaded in the first place. This should be checked as part of the site survey, conducted by your MCS accredited installer. You should ensure that nothing will shade the modules during the middle of the day, when your system should be producing the most energy. Shading can be checked using a special design tools that show the path of the sun behind various shading objects. This can be either a lens that shows the horizon and path of the sun in front of you, or a full design software package that uses photographs of the surroundings.

With snow it does help to clear it off. But there isn’t usually much sun when its snowing, and if the sun does come out, the snow melts pretty quickly.

If you cannot eliminate shading as is often the case in built up areas, there are several technologies that can limit the effect of it. Many solar panels now include bypass diodes that disconnect groups of solar cells if they are shaded. It is fairly crude but often works well. When you buy solar panels make sure to ask about bypass diodes.

A second technology that is not available yet in Europe but soon will be is distributed conversion. Here, rather than have power electronics (like the inverter) positioned all in one place, you have some electronics placed on each module. This allows each module to operate independently. One company in the US called Enphase claims this technology increases power output by upto 25 percent.

These are all things to bear in mind when buying a photovoltaic system.