Leaked FiT reduction document....

Many of you will have either seen or heard about the alleged 'leaked' document onto the Energy Savings Trust (EST) website. In a nutshell, it indicated the current 43.3p FiT will be reduced to 21p on December 8th 2011.

Obviously, this is a bombshell to many people, whether installers or customers booking installations before the well documented FiT adjustment date of 31st March.

However, DECC have come back on Twitter with the short statement:
'Consultation on changes to the solar PV FIT to be published to Parlt on Mon. Doc on EST site earlier was neither final nor accurate'
Thus admitting this was an error!!

So, we will need to wait till Monday 31st Oct 2011 for the real version. Lets hope the document was wildly innaccurate on the date. However, a rate of 25p has been assumed for some time, as this will bring the payback time back to 10-12 years as was originally designed at the start of the FiT, and still far better than the Bank can offer!

To see the rogue document click here for a link

Check in with us on Tuesday 1st November to get an update on the real facts.

Learning the ropes

Yet more rope access training today for the guys. This new RNLI project has proved to be a good chance to improve the guys skills.

Lets hope the rains stays off for the rest of this week!

RNLI Sea Survival School

This week we are starting to install a 44kWp system on the RNLI's Sea Survival School in Poole, Dorset.

This is the culmination of putting a number of designs together to enable the RNLI to generate as much power during the day to offset importing power to run the famous Sea Survival School, as recently seen on TV channel Dave .

The plant used to regulate and operate the pool, wave machine and other hi tech bad weather simulation for Lifeboat crew training will soon be run using Green power generated from one of our Solar PV systems installed onto the roof.

As the installation progresses, updates will be posted here.

Website Offline

Over the last week or so we have had an interruption to our Website at www.chrisrudge.co.uk as the server was hacked to try and redirect people to another website.

While this was very inconvenient, and caused some confusion to quite a few people, everything now appears to be back to normal following work carried out by our server provider, plus we have now moved to a new more secure server.

Thanks to everyone who called and reported the problem, as we were quite oblivious to the problem.

Look out for Solar 'Sales' only company's

As heard on Radio 4 today by clicking here for iplayer (only last for 7 days), there are an ever growing number of sales based company's simply out selling 'Free Solar Systems' to customers.

While the whole concept of free solar panels also described on Radio 4, works for some who cannot afford but would like Solar panels to assist in supplementing their daytime electricity use, it does have a seedy side to it!

Most of the Free Solar companies are simply investment groups looking for a fast buck, and are quite happy to let 'sales' companies go and sell systems for them and buy the completed sale from them.

As you can imagine, this practice is bringing the free solar industry into disrepute, and the REAL assurance scheme are about to beef up the rules over this practice in the next few months to stop this practice.

Not only free solar is affected, to a lesser extent some sales only companies have been set up to simply sell the product and then sub contract the work off to a real installer to actually do the work. Obviously, some larger companies like EDF & Tesco who carry out this practice we would hope keep some control over what happens on the actual installation, but the best bet for any potential Solar PV owner is to look for an installer who has a track record and will be accountable, plus now that PV module prices are dropping, payback times are usually only 7 - 8 years.

Optimised power use with a PV system. Make more use of your Free to Use power!

One of the side issues of the Feed in Tariff with Solar PV is besides the wonderful 43.3p your system will earn from for each unit generated, you are able to use as much of that generated power as you can at your premises without penalty. However, most dwellings will only use around a third of all the available power generated. Most houses are big power users during hours of darkness with lights, TV, etc, PV generated power not much benefit in this case! Even if you are at home all day and running the washing machine, lawn mower, computer, etc this will only scratch the surface of peak generated power of a standard 4kWp system in the summer.

At customer’s request, we put together a test unit a while back and it’s been running faultlessly on test in a customer’s house for some 6 months or so with great effect. They have not needed to use gas to heat their water all summer, beats getting a Solar Thermal system! It will also be of considerable benefit to people who have had 'free' PV systems, only to find minimal financial gain and will be going through a period of disapointment.

The unit is fairly straightforward, and does require you to have a hot water tank with an immersion heater installed. If you have it does the job for very little outlay. There are intelligent units on the market which do the job far more elegantly, such as the EMMA and the Power Router (which we install), but as you can imagine, the purchase cost of such units are into £1000’s rather than this little control circuit which comes in at under £100 in components, or £180 + VAT to buy complete from us.

Before going any further, I strongly insist this is only assembled and installed by qualified personnel who have the knowledge and capability of recognising safe working with electricity and protection of components and wiring.

The Circuit (click on the image above to get full size)

The live output from your inverter is diverted through a Current Sense unit, which is set for a switch point optimum this application. This Current Sense unit has a built in low current relay, which is used to switch a suitable contactor. I would suggest a 10Amp contactor at the very lowest for the sort of use we are looking at.

You will see from the description below, together with reference to the circuit diagram, the ideal location for the completed unit is adjacent to your consumer unit (fuse box). As both the inverter and your immersion heater will be connected directly to this point, it really does make sense.

You can refer to the circuit/ layout diagram for the following:

1) The mains 230v AC output from the inverter needs to have the live conductor diverted through the current sense unit, but otherwise remains connected as normal.

2) The Current Sense built in relay terminal is supplied by a spare 6A MCB in the consumer unit. This relay will switch the contactor. As well as the 6A MCB, it is advisable to provide a 1A inline fuse to protect the relay and contactor coil adequately.

3) The main relay on the contactor will switch the live output from the water / immersion heater in the Consumer unit. To do this will involve diverting the existing immersion heater wiring to route through this unit. Due to regular switching this circuit will now be cycling through an inductive load, it is recommended you change the 16A MCB to a ‘C’ type 16A MCB to avoid nuisance tripping.

At the hot water tank, you will need to disconnect the immersion heater wiring from the wall switch and fit with a 110v yellow plug. Change the immersion switch to a standard switched socket. Plug a 3kVa 110v builder’s site transformer into the socket, and the newly plugged immersion heater cable into the transformer. That’s it!

Operating:

Normally, your immersion heater runs at 3kW. To make the most of the free to use electricity available, we need to make the heater use less power. By far the easiest way to do this using standard and cheap to buy parts is by a 110v site transformer, available from screwfix, etc, at around £50 each. Once the transformer is in place, this will limit the power consumption of the immersion heater to around 700W. For a standard 200ltr water tank, we have found the immersion running for most of the day will heat the whole tank to around 50 degrees. This obviously assumes the day is bright and sunny all day of course!

On a unit supplied by us we would set the current switch to around 800W, so will only switch your immersion heater on when the inverter is generating more than 800W, ensuring immersion heater usage is powered by the PV system.

It must be mentioned, that although the Current Switch has a built in hysteresis to avoid relay chatter when passing current is marginally over or under the set point, on a day with patchy cloud you will experience the contactor clicking in and out regularly. This can’t really be avoided on a simple circuit as this, but has not proved to be an issue in the 6 months of operation in our test unit.

In essence, the controller is very basic and I will always welcome suggestions to improve the design.

4kW or not 4kW? That is the system..

Many of you guys may have already encountered the newly enforced grid connected inverter G83/1 requirements recently. In simple terms, all the District Network Operators (DNO's) have finally got together and are now insisting that all installations should completely comply with G83/1 requirements. Click here for ENA guideline document

For the purposes of changes that affect us, this means you can no longer have a Grid connected renewable power system that can export more than 16Amps without special permission. In principle, this has always been the case, however when we first started installing PV some years back the DNO's were quite happy to bend the rules a little to accomodate a possible maximum of 17.4Amps. Now due to the heavier installation rates of PV, and possibly upsetting the balance of local electricity networks, the DNO's have laid out simple rules:

1) If the output of the system will never be more than 16A, install as normal with normal notification when the work is complete.
2) If the output of the system may exceed 16A, then a G83/1 Stage 2 application will need to be carried out. The DNO will carry out a network study to ensure the local network will take this extra power, possibly charging you up to £250 for costs, and will advise if you can indeed install this system. Do not install and connect the system first, or you may be issued with a disconnection notice.

This all sounds pretty harsh, but in practice its not so bad if you can adjust your thinking. One of the main problems until recently has been availability of a good range of 3.6kW inverters to match the UK G83/1 standard. These are now coming on board by all the manufacturers quite quickly. SMA (Sunny Boy) for example are simply de-rating their 4kW range and certifying for the UK.. Easy!

On the other side of the coin, in the UK for the most part a 4kWp system will hardly ever generate 4kW. There will be occasions on a south facing roof in midsummer, when the module temperature will be low enough to maintain efficiency, you will see the meter clock over the 4kW mark, otherwise it will lurk around 3.5kW, in bright sun, obviously less as brightness reduces.
Thus, carry on installing those arrays of 3.98kWp, etc and connect a 3.6kW inverter. That way, you'll still be generating just about the same annually as you would by fitting a 4kW inverter.

While I could ramble on about ideal inverter sizing for a given size of array, the above info kind of covers this in itself, plus re assuring you the new DNO requirements are really not a problem, simply adjust your thinking.