Skip to main content

PV Solar Energy - not all that it appears, for me at any rate

I installed a maximum sized domestic 4kw PV solar cell array on my South facing roof just before the government cut off date of 12th December 2011. I therefore qualify for the maximum Feed In Tariff of 43p per kw hour which ought to pay for my investment in about 8 years. So far so good. I do have a chimney which does interfere with some direct sunlight, and later in the day some distant trees do obstruct the sun in winter, so I am not expecting my array to produce as much as a set-up without interrupted sunlight. But I was led to expect a daily average throughout the year of 10kw hours (about 3,500 kwh per year). Our array has rarely produced more than 3 kwh in any day since 12/12/11, despite several very sunny ones. So I called Solarking, the installers (who did pull out all the stops to make sure I had  my installation up and running before the deadline. They were also extremely courteous and delivered a very tidy job). They said, "Don't worry, nobody gets much more than that in the winter months of low sun and shorter days. You'll make up the average when the sun is higher, stronger and lasts longer". Fair enough, I thought... until I received this from a friend who lives in the next county:

As you can see, during January he has achieved 5 days of around 10 kwh or more. In fact he is producing on his worst days the same as I produce on my best!!

In 46 days since installation I have produced 100 kwh = an average of 2.17 kwh per day. My friend's average is more than double this at 4.99 kwh.

I also wasn't offered the same type of web-based monitoring system that he uses, so there's another reason for a gromble...

...but come on! There must be something significantly wrong with my set-up for there to be more than twice the difference in output - even allowing for a chimney and treetops at dusk.

This posting will be tweeted to Solarking for an explanation. Sadly they don't publish an email address for ongoing support, otherwise this debate wouldn't be happening in public.
Labels:

Comments

  1. chimney pipe27 January 2012 at 02:03

    2.17 kwh per day, it is really so powerful! best wishes to you.

    ReplyDelete

Post a Comment

Thanks for taking an interest.

Popular posts from this blog

Phillips screws - yes I'm angry about them too

Don't get me wrong. They're a brilliant invention to assist automation and prevent screwdrivers from slipping off screw heads - damaging furniture, paintwork and fingers in the process. Interestingly they weren't invented by Mr Phillips at all, but by a John P Thompson who sold Mr P the idea after failing to commercialise it. Mr P, on the otherhand, quickly succeeded where Mr T had failed. Incredible isn't it. You don't just need a good idea, you need a great salesman and, more importantly, perfect timing to make a success out of something new. Actually, it would seem, he did two clever things (apart from buying the rights). He gave the invention to GM to trial. No-brainer #1. After it was adopted by the great GM, instead of trying to become their sole supplier of Phillips screws, he sold licenses to every other screw manufacturer in the world. A little of a lot is worth a great deal more than a lot of a little + vulnerability (watch out Apple!). My gromble is abo
7 comments
Read more

Addictions. Porn, Drugs, Alcohol and Sex. Don't prevent it, make it safer.

In 1926 New York, during Prohibition, 1,200 people were poisoned by whiskey containing small quantities of wood alcohol (methanol). Around 400 died, the rest were blinded. The methanol they drank was in the moonshine they had bought illegally. In fact it had been added by law to industrial ethanol in order to make it undrinkable. Prohibition existed to protect everyone from the 'evils of the demon drink'. However, people still wanted to enjoy alcohol. So bootleggers bought cheap industrial alcohol and attempted to distill it to remove the impurities the state had added, but the process wasn't regulated. The state was inadvertently responsible for the suffering - although it was easy for them to blame the bootleggers and to justify escalating the war. This didn't stop the bootleggers. In fact it forced them to become more violent to protect their operations, and even less cautious about their production standards. Volumes of illicit alcohol, and therefore proportionat
Post a Comment
Read more

The Secrets of Hacker Golf

Social media is awash with professional golfers selling video training courses to help you perfect your swing, gain 50 yards on your drive and cut your handicap. They might help a few desperate souls, but the rest of us hackers already know everything we need to complete a round of golf without worrying the handicap committee or appearing on a competition winner's list. What those pros don't realise is that for us hacking golfers who very occasionally hit shots that if you hadn't seen how they were hit, end up where the pros might have put them, we already know everything we need to know - and more. Unlike pros who know how to time the perfect swing in order to caress a ball 350 yards down the centre of a fairway, we hackers need to assemble a far wider set of skills and know-how to complete 18 holes, about which pros have no comprehension, need, or desire to learn. Here are some of them: Never select your shot until after you've hit it. A variation on this is to alway
2 comments
Read more