Solar PV Ordered!

reeac

SpudSpud wrote: »

Research not required!

i'm a specialised electrical engineer who oversees connection of wind turbines,hydro and solar PV onto the grid (11kv upwards).
I've worked in Holland Germany, Spain and now the UK doing this.

you can find the link to this by typing in G83/1 into google and down load the PDF regaring this.

I'll give an example

a solar PV system produces 3.6KW Dc from the array a new installation will produce up to an average of + 3% tollerance (an extra 108w of power in total for the total array) an inverter such as a sunny boy has a efficiency of 97% so the gain in the array will be lost in the inverter and a further 2.8% will be lost in the cable, connectors, isolators etc. if the job is sized correctly.
a 15 m cable run using a twin and earth should be sized for 6mm for the voltage INCREASE on the grid not the voltage drop (as per BS7671) as it's a SSEG generator embeded onto the localised grid network; a spark would normally size this on a 2.5-4mm at a push.

Hence why you should keep your system at 3,6 Kw 3.7 at a push any more and you could face having your system shut off if it's been registered in the first place that is check with your DNO (not electricity supplier) to see if they have registed your system.

as for the feed in tarrif at 4Kw that is a level that was set by the goverment quango who never bothered to consult the power companys properly so there is a 340w no mans land in the feed in tarrif

Check my facts
Mass confusion

PS can anyone tell me how to size a DC isolator properly for a PV solar array .......Bet not!

Just in reply to your PS, I Googled "DC isolator" and found websites that sold them, looked at one of them and saw that they specify maz. voltage and current for each one so I guess that I could specify for a given array of panels ... am I missing something?

keith_r59

Cardew wrote: »

http://www.bbc.co.uk/news/business-13296404

Unfortunately there are rogues about in every industry and also gullible people who will get taken in by them.

That is why the advice given in the article should be heeded:

• Check your location - is it south facing? Is there any obstruction such as a tree?
• Don't sign with a salesman on the day even if offered a discount
• Get at least three quotes
• Check the company you are buying from - it may not be the company in the advert
• Check company is MCS certified
• Pay by credit card if possible as this makes it easier to claim a refund

A lot of which is common sense for any major purchase and has been repeated on these forums numerous times.

zeupater

SpudSpud wrote: »

Research not required!

i'm a specialised electrical engineer who oversees connection of wind turbines,hydro and solar PV onto the grid (11kv upwards).
I've worked in Holland Germany, Spain and now the UK doing this.

you can find the link to this by typing in G83/1 into google and down load the PDF regaring this.

I'll give an example

a solar PV system produces 3.6KW Dc from the array a new installation will produce up to an average of + 3% tollerance (an extra 108w of power in total for the total array) an inverter such as a sunny boy has a efficiency of 97% so the gain in the array will be lost in the inverter and a further 2.8% will be lost in the cable, connectors, isolators etc. if the job is sized correctly.
a 15 m cable run using a twin and earth should be sized for 6mm for the voltage INCREASE on the grid not the voltage drop (as per BS7671) as it's a SSEG generator embeded onto the localised grid network; a spark would normally size this on a 2.5-4mm at a push.

Hence why you should keep your system at 3,6 Kw 3.7 at a push any more and you could face having your system shut off if it's been registered in the first place that is check with your DNO (not electricity supplier) to see if they have registed your system.

as for the feed in tarrif at 4Kw that is a level that was set by the goverment quango who never bothered to consult the power companys properly so there is a 340w no mans land in the feed in tarrif

Check my facts
Mass confusion

PS can anyone tell me how to size a DC isolator properly for a PV solar array .......Bet not!

Hi

Being in the industry you will understand the term DNC (Declared Net Capacity) and know that this relates to the maximum output of a system. If the maximum capacity of a 32A potential system is limited by software, or other device, to 16A is it not true that the DNC is 16A ? ..... is it not also the case that the DNOs require pv systems to be registered according to the DNC ?? ..... also, is it not the case that many inverters are pre-programmed to operate within the 16A/phase requirement and that the inverter software settings are set to conform within particular national requirements and are protected against unauthorized change ???

I'm not a qualified expert in these issues, it would be good to hear your views on this.

Z

zeupater

Sharon1985 wrote: »

This forum is for everyone to share their experience of solar pv and installers they use
If I wish to complement them for their efforts I have a right to do so.
Real Does state seven working days cooling off period but I it was my personal request to install the system ASAP due to my husband coming home from a long stay in hospital. I and my husband started on this venue to install solar power together and our wish was for it to be completed by the time he returned home. The installers pointed out they had to leave a seven working day cooling off but if I don’t mind if the days are not ‘’working’’ days I really don’t see the problem.
And the scaffold was put up on first day of install.
I can also say I looked into installers for weeks on end had 9 quotes and every time on every issue
From products used, references obtained, accreditations the installers I choose come out on top
Any questions I asked them where back up with evidence.

The sign up to install was quick (my demand) but my research took weeks

I’m upset at by your comments and think you should keep your judgmental comments to yourself.

Rant over!!!!!!!!!

Hi

Apologies if you feel upset that the contents of your previous posts seemed to be spam, therefore I will not automatically consider that your latest 'group discount' post is a little suspicious too ..... also, please pass my congratulations on to the scaffolding company who came out on a bank holiday, obviously at no additional cost considering the price which you mentioned, to help your installer out, and also to your installer, which you have mentioned by name a number of times, who also worked over the bank holiday and had complete faith in their scaffolder's timing in order to plan to do so ..... they are both exemplars to their respective industries.

Z

stoozey

does smell fishy.

thenudeone

SpudSpud wrote: »

Hence why you should keep your system at 3,6 Kw 3.7 at a push any more and you could face having your system shut off if it's been registered in the first place that is check with your DNO (not electricity supplier) to see if they have registed your system.

as for the feed in tarrif at 4Kw that is a level that was set by the goverment quango who never bothered to consult the power companys properly so there is a 340w no mans land in the feed in tarrif

Presumably all we mortals need to do is check with the installer that they have obtained the necessary permissions?

Even if we don't; the problem still falls squarely into their court as far as I can see. They are the turnkey contractor and it's their job to get everything sorted.

Equaliser123

zeupater wrote: »

Hi Sharon1985

I'm not saying that your posts are spam,

I think you are being too kind. I'd say they are spam...

zeupater

ecofreaks wrote: »

HI all

Looks like they went to alot of effort for this customer , but people do work bank holidays too . :money:


I am looking into solar power at the moment
I understand most of it but how is export tarriff worked out

any one know good installers

Hi

Unless you have an export meter the amount you export will be assumes as being 50% of what you generate. Effectively, with the export tariff being 3.1p/kWh you could say that it's 1.55p/kWh on total generation ....

Regarding good installers, that really depends where you are in the country and what system/make you have a preference for.

HTH
Z

jackieblack

Equaliser123 wrote: »

I think you are being too kind. I'd say they are spam...

If it looks like a duck and quacks like a duck........

Equaliser123

jackieblack wrote: »

If it looks like a duck and quacks like a duck........

Can I have a guess? A cow?