array

  1. P

    Pv array earthing why?

    I am confused why you have to carry out a bond to the array if you use a inverter such as the Sunnyboy HF> To me when u install the array on a roof it is out of reach and you will cause problems if you bond the array to the main earth of the house because of lighting strike. If you bond it...
  2. M

    array earthing / bonding

    evening all, I'm after a definitive answer regarding array earthing please. links to information would be fine? I read the 'decision tree' on the dti guide, and decided that, using a transformerless inverter, the array would need a separate 10mm bond to a dedicated rod. The supplier then...
  3. J

    Voc of pv array

    Can anyone help. I have measured the Voc of a pv array at the DC isolator. I get 400 V and the array should measure 450. The Voc on the back of each panel says 37.5 but when tested with a volt meter each panel is reading about 33 which x12 would be about 400v. Does anyone know how accurate this...
  4. I

    Array Earthing help please!!!!!!!!

    Im after some advice, Weve installed about 10 systems all the same mitsubishi 225w panels x 6, sunnyboy sb1200 inverter. A representative of the scheme that these were installed for had thier own system installed by another company who earth bonded the array and said that all of our installs...
  5. R

    Wind noise of roof mounted PV array

    I just conducted a site survey and got a new question that I didn't know the answer to.... The customer has an open barn conversion and explains that the rain makes a terrible noise and can disturb tv watching for example. The PV panels will provide a barrier to rainfall hopefully reducing the...
  6. B

    SMA 1200 Sunny boy not working

    Hi I have installed our first PV system, which we are using to get MCS accredited with. Its a small 5 panel system as roof space is quite small. The panels are 195w each. The Voc for the panels @ STC is 45.21V and Isc @ STC 5.56A. Our measured Voc on the day of commissioning was 211V. I thought...
  7. P

    usual question - pv array earthing!

    I am currently carrying out a design for a 4kW system, using class 2 modules, cables and connectors. using sunnyboy 3.8kW (with isolation transformer). Having read the dti guide i am sure I am to leave this system floating (TNCS earthing system). i.e. I will not connect/bond the rails, frame...
  8. D

    Pv Array Test Report Help

    Hi all I am currently in the process of completing my first PV array test report but have run into a bit of difficulty. How do I calculate the Isc in the array parameters section? And I understand the Sun in the string test secion is related to radiance, do I need to buy an expensive tester to...
  9. T

    array insulation resistance

    does anyone understand that dti guide. itsays to do test [ir] on array cables. how can this be acheived during daylight. also if not earthing array frame if using isolating transformer inverter with tncs do you probe earth on ac isolator switch for pos-earth neg-earth on test.comments welcome.
  10. Worcester

    Earthing the Array - Practically

    Don't want to get into a discussion here about when to earth the array or not. Lets' assume it MUST be earthed. How are people doing it? 1) Attaching an earth strap (braid or cable?) between each panel and the rail (one or both?), then joining all the rails together (parallel), and then a...
  11. SolarCity

    Solar Array performance data

    Seeing as we have so many installers on this forum, an idea struck me about the performance of solar arrays. Seeing as between us all we must have hundreds of installs under our belts, wouldn't it be handy to collect all the data from these installs and save them on a seperate website...
  12. E

    New Sharp PV Array???

    Been asked by a potential client about some new wonder array from sharp? No doubt it's a salesman from another company thats informed them. Has anybody else heard of this 'new array'? Or is this just another typical salesmans trick trying to get one over our quote?
  13. J

    A question on array frame earthing

    Afternoon all. Got a commercial job starting in a couple of weeks - 50kW install spread over a couple of chicken shed roofs. Using SMA TriPower inverters - transformerless, so array frame bonding required. Sheds are steel structures, with steel clad roofs and sides. Inverters will hang...
  14. O

    pv array test report query

    HI, just filling in forms for dno and i am not sure what to enter for protective device (type, rating, dc rating and capacity) under to string columns. is it refering to the dc isolator? any advice is helpful. cheers martin
  15. O

    array earthing for sma1200

    Hi just fitted my first system for the mcs inspection and i'm not sure wether i need to bond the array frame. its on a bungalow and there's nothing nearby that can introduce earth potential and the panels are class 2. but im not sure about the inverter. the spec says LF transformer and...
  16. T

    DNOs and G83 limit

    Guys, can I ask you all to reply to this thread with details for each DNO that you have had dealings with and their approach regarding the G83 16A limit - plus any info if you have seen that this has changed over time. The ENA have confirmed that the correct value to use for the G83 limit is...
  17. E

    size of array

    hello all, can anyone help with these questions please. 1. if installing on a 3 phase system can i go up to 4kw per phase or is it limited. 2. am thinking of doing the pv course then getting mcs, are you guys that fit it really busy with it or do you do it around your normal i.e electrical...
  18. SolarCity

    16A threshold for G83 - Array size or inverter output?

    The saga continues. I was told today by an engineer at Central Networks that it is inverter output that is important when considering the G83 threshold. Hopefully this will be the stance all DNOs take before long.
  19. yellowvanman

    Mounting an Array

    Looking at my 1st install, electrically piece of cake! Mechanically/structurally I'm a bit nervous. Customer wants an array on a barn roof. Whole structure is made of pre-formed concrete pillars, joists etc. Newish roof is metal panels which have been screwed onto wooden battens that I guess...
  20. M

    Array Touch Voltage - Corrosion

    After our recent NICEIC inspection, we were advised to earth ALL arrays by the inspector. This is apparently common practice in other countries due to the chance of capacative coupling causing an AC voltage to occur on the panel array. Due to the various safety features used in inverters...

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