array

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  1. F

    Earthing PV Array? - 22.5kWp System

    I have read the DTi guidelines and it says earth the array to a rod as main earthing system is PME. I have also spoken to several people who say leave it floating. I'm using an SMA Tri Power TL which obviously has no transformer. Who is right? It is on a 3 storey building so no one can get...
  2. F

    If I added a second 3-4kWp array.........

    Where does it say in the literature how my existing FiT rate and duration would stand, and how I would stand with the new array? All I can find is mention of arrays with total installed capacity >4kW, and no mention of how to apply for additional arrays on Scottish Power's FiT application...
  3. S

    increasing the size of an array

    Quick question - to increase the size of an existing array, the new panels will come under the new FIT rate. Npower have said that we don't have to install a 2nd generation meter as they will pro rata the payments to reflect what has been installed. If we did want to install a 2nd gen meter...
  4. J

    Bonding the array

    Evening guys I know this one has been done to death, just wanted to share my proposal for an installation we are about to install. Fronius TL 3.6 inverter PME supply Velux window, although im pretty sure that the array will not be accessible from this window. After reading the DTI i have come...
  5. E

    2 Panels on different plane to rest of array...

    We have quoted a system of 14 panels that fits very nicely on a roof. To the side of the roof is a dormer with a plane of about 20Deg compared to the main roof which is about 30Deg, the customer wants to jam an extra 2 panels on the dormer. Conventional PV thoery dictates this is a no-no but i...
  6. I

    Bonding the array frame on house roof

    Came across an install today neat job but the array frame had been bonded back to the MET on a TNC-s system, in these cases i usually take down to a stake or to the MET in a TN-s, What would the actual implications of this be in reality other than not by the book? I cant think of a scenario it...
  7. F

    Second PV Array requires Three Phase?

    In recent weeks I have been exploring (and continually bumping into dead-ends) the possibility of adding additional PV to my property (I already have 3.75kWp with 3.6kW/16A-restricted Aurora inverter). I happened to get an out-of-the-blue phone call today from a solar company who were one of...
  8. F

    Adding a second 4kWp+ array - questions

    I already have 3.75kWp (45.4p FiT). I am giving thought to adding a second array (subject to how the panels could be fitted into the available space to my liking) before the changes to FiT's in August. An identical property to mine, but without PV, had a recent EPC of E (only acouple of points...
  9. D

    Testing an array without AC supply on site?

    Chaps, We have an installation to do which is quite a long way away from us. It's a new build and there's no electricity on site yet, they're using generators at the moment. I'm just trying to think how I can test the system. I can test the DC side as I would normally but struggling to think...
  10. D

    Question for the experts - Advantage or disadvantage of changing my array ?

    We have a single array of 12 Sanyo HITs ( 240's ) all wired in series and connect to a SMA SB3000HF-30 We have part shade from the East in the morning till 9am, then shade commences again from the West due to trees at 4'sh...... these trees will be no longer very soon :gettree: The inverter...
  11. P

    Earthing of array (cable size)

    Lads when ive earthed an array TL invertas ive always used 10mm G/Y to earth rod! another company i have fitted one for had inspection and were told it should be 16mm ?? thats b----ks is it not?
  12. F

    PV Array Frame

    Guys In the DTI Guide 3rd Edition Bonding Decision Tree it shows that the PV array frame of Class II panels should be bonded to earth if it is an extraneous conductive part. The defintion of an extraneous conductive part being that it can introduce a potential, normally an earth potential. In...
  13. M

    Peak output exceeding quoted panel output?

    Hi - I have a 2.99kW solar array, and the top output I have had had previously been yesterday's 2800w at one point at lunchtime which I was more than pleased with as I was under the impression the maximum could be 2999w? Today on 3 occasions output was over 3000w (peak was 3080w). Have I got the...
  14. B

    2 SB 3800 Inverters, 9600 kwp array, one 60m export cable. Inverter cutting out?

    I have a recurant problem on a system which one inverter gets a AC fault. This happens alternately, either one inverter or the other. The fault seems to be at peak output but does not trip any breakers. The system is very wrong in the fact its all on the one phase (as only one available), but...
  15. W

    Array bonding needed?

    I have a SMA 4000TL and I'm not sure if the arrays are bonded (I can see no evidence that it is). Is this dangerous and does it break any rules or regulations? There is no access to the roof. Will the TV aerial will be earthed through the cable And if so would bonding have to be to the...
  16. M

    help on Earthing groundmount PV array with rammed metal posts

    I'm installing an aluminium framed groundmount PV system with an SMA 17000TL inverter and wondering about the array frame earthing. The posts are rammed about 1m into the ground. Do I need to install an earth spike for each array. The Array is around 120m from the main dist panel and incomer...
  17. F

    PV Array problem - or not?

    Hi, I installed a PV system recently on a three phase installation. Each phase had its own inverter so effectively three single phase installations. Two of the inverters were to have 12 x 250watt panels connected, the third was to have 14x 250watt panels connected to it. Until that point all...
  18. S

    TL inverters IR testing

    Sorry to raise this question again. What are you guys getting on your DC IR test's on new installs? I've been doing some DC IR testing on Fronius 3.6 IGTL inverters and they are coming back as 50-100M ohms which is fine as far as DTI guide says, but not what I was expecting ie >999M ohms type AC...
  19. S

    Flat Array need help

    Hi Everyone We will be installing a 4kwp 16 panel system on a flat roof in London, it the first one we are doing and i am worried about the wind load factor as it will be exposed. Can anyone offer any advice or if they have installed one before. thanks for your help in advance
  20. C

    panel loss

    my father in law had an array of panels fitted, the inverter had a digital display that showed a flat line that equated to the number of panels he has installed, that flat line has now equated to having 4 of the panels disconnected. The installer has said there is a problem and downloaded the...

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