string

  1. G

    Use of Micro Inverters on one string.

    Hi all, I'm looking at a job where the customer would like to use Micro Inverters on a particular string, due to shading issues. However, we want to add 2 more strings which would be fine with a normal inverter. Is it possible to mix and match like this? I've not used Micro Inverters before, but...
  2. P

    How do you wire your panels?

    I can't really find anything on this and it wasn't taught on the course but do/should you... 1) Wire the panels so a big loop is formed on the roof from +'ve to -'ve or 2) Wire so that the loop is kept small and the +'ve/-'ve follow the same route around the panels using more wire and a bit...
  3. I

    SolarEdge

    Hi All, Has anyone commissioned a solaredge system? I need to establish how to measure the string short circuit current (Isc) for the commissioning sheet. Has anyone done this? Thanks - itty
  4. D

    One string suddenly seems to have reduced output

    On my newly commissioned system - 16x Sanyo HIT240 and SMA 4000TL - all has been going well, even to the extent of seeing over 4kW on the inverter dispay a couple of times yesterday and this morning. This afternoon, in good sunlight, I notice one of the strings will never get above 1.8A (about...
  5. W

    Sunny boy software

    Hi, Im trying to match an inverter to 9 Suntech 190 24AD+ Mono panels. It wont allow 9 in one string but will allow 2 strings of 4. I'm trying to get it to show 1 string of 4 and 1 string of 5, is this possibe or am I not using the software properly? TIA Woko
  6. S

    1 central or multiple string inverters for 50kW system

    Does anyone have an opinion on the route to go for a 50kW system that either has 1 large central inverter or many smaller string inverters? My immediate thoughts are: 1. If some of the panels or inverters drop out then at least remaining parts of array will produce energy for a system that uses...
  7. M

    Balanced strings in parallel

    I am designing a 2.3kw on roof pv sytem at the moment but am having trouble sizing an inverter, for 15 modules in 3 parallel strings, so the easy option is to go for 14 mods in 2 strings. The question is could the strings be imbalanced? ie 1 string of 8 and 1 string of 7 in parallel, thus...
  8. M

    Smallest number of panels in a string and the effects of shading on HIT panels

    We're busy collecting quotes at the moment, we've got an awkward install in that we have very little space on the roof for PV, and slight shading issues, I'm trying to understand the pros and cons of what we might be able to achieve. At the moment it's looking like we can fit no more than 5...
  9. D

    DC Isolator per MPP Tracker or String

    I would like to ask in terms of the installation of a DC Isolator. I ve got an inverter with two MPP Trackers. At one tracker, 2 strings are connected. At the second one, only one string. Do I need 3 DC isolators (one per string) or 2 Isolators (one per tracker)? Thank you in advance!
  10. L

    modules per string per mpp tracker

    I am receiving all sorts of differing advice on the above subject. Can you advise me on the correct way to calculate how many pv modules are required per string per mpp tracker in order to ensure that the inverter operates efficiently.
  11. M

    Electrium mcb recall, How long is a piece of string??????????

    Electrium mcb recall, where do you start? what is the best thing to do? I cant go round every job surely!!????? Any help please advise
    • mgnelec09
    • Thread
    • aus electricians' talk long mcb piece recall string
    • Replies: 1
    • Forum: Australia
  12. D

    1 string or 2?

    Chaps, if the inverter can take the voltage and wattage etc of an array as 1 string what are the reasons other than differences in panel shading / orientation / pitch to split an array into more than 1 string? Thanks!
  13. W

    String fuses?

    Hi I'm getting confused about the use of string fuses. In the dti guide 4 or more strings in parallel require string fuses to be used in the design of a system. In certain sma inverters, for example the tri power tl8000 they already have string fuses built in. There are 4 d/c inputs on...
  14. O

    Drying plaster - how long is a piece of string

    opinions please: Derelict house for 8-9 years, leaky roof, walls prior to plastering felt wet, roof now fixed, replastered - up to 2 inches thick in some places. No heating. How long should I leave the property before I try and do the 2nd fix/test? Very concerned about all the moisture in...
    • Octopus
    • Thread
    • aus electricians' talk long piece plaster string
    • Replies: 11
    • Forum: Australia
  15. SolarCity

    10000TL inverter - 3 phase output and number of strings

    Does anyone have any experience of the SMA 10000TL inverter? I was wondering whether the number of strings had an effect on the 3 phase output of the inverter. For example, does the array need to be arranged as 3 seperate strings?
  16. C

    What colour DC Cable from string back to DC isolator?

    I bought an MCS starter kit for my MCS assessment from Segen. All is installer and working OK - or so I thought. I recall reading seeing a previous thread on here over the weekend about the correct colour to use for DC cable. My starter pack from Segen included 100 meters of 4mm double...
  17. D

    String fuses

    Hi all, Just running through the "Photovoltaics in buildings guide - 2nd edition", as you do, and can't get my head around the string cable requirements. p 16, 2.1.5 says: "For a system of N parallel connected strings, with each formed of M series of connected modules, string cables are to...
  18. J

    String fuses

    The (desparately in need of an update to reflect current technological advancements imo) DTI guide to the installation of PV systems states the requirement for string fuses when there are 4 or more parallel connected strings. What if I take these 4 strings and connect them to an inverter with...
  19. D

    MCS Array test help

    I have my MCS assesment booked in 3 days and I need some help with the testing on the DC side, We did not perform the tests and I need some rough figures for Voc and Isc string test and also the Array insulation Resistance Pos- Earth and Neg-Earth. Any help would be much appreciated Thanks Dan
  20. edexlab

    no of modules to a string?

    Hello all I'm new to PV can anyone tell me what the procedure is for determining number of modules to a string, I know the ideal is to keep voltages down to 120v or less ,is this the norm?:confused:
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