strings

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  1. R

    2 x 4kW strings on farm.

    Both inverters gonna be fitted in an open barn (fronius ig plus) One is going to a holiday cottage (58m overhead run) and the other to the house (55m overhead run). I`m thinking 4mm cable for each due to voltage drop. Cause its a farm and open barn what ya think on the height of the...
  2. G

    Strings uneven MPPT Voltage

    Hi all I have just had a 3920KW Sharp 16 X 245W panels fitted with a Solar River SR4K4TLA1 inverter. There are 2 strings. One is currently reading around 330V and the other is just below 200V. 6 of the panels are landscape and 10 are portrait. I have since found out that 6 are on one string...
  3. C

    Kostal Piko with 2x7 or 2x8 strings sanyo - low Vmpp?

    Hi there, first post! Looking at a Kostal Piko 3.6 for a 14 or 16 Sanyo module install. The dual MPP would be useful, though not essential. However their software flags up a low Vmpp - with 2x7 strings the voltage is 269v at 65 deg/306v under STC. The minimum MPP voltage is 340v in two tracker...
  4. yellowvanman

    1 run of conduit or 2?

    have an east west install - 2 strings - do I run the dc cables down to the garage in 2 runs of conduit (20mm) or stick them all into 1 run(25mm)?
  5. W

    1 or 2 strings

    I am using 16 x 245w REC panels and a 3.6 Fronius inverter. Max PPT voltage for the Fronius is 700V and the voc for the panels is 37.2V (x 16 = 595.2V) So no problem to have it on 1 string. Orientation and pitch exactly the same for all panels, Min PPT 350V (8 x 37.2V = 297.6V). Does this...
  6. E

    Mastervolt Inverters not starting up.

    Hi, Installed 2 Mastervolts over the past 2 days (the first time we've used them) and we are having an issue with both of them!!! They haven't clocked anything on the generation meter at all. I've checked the wiring on each of them it just seems highly unlikely that there are 2 faulty...
  7. C

    Pulling in the purse strings

    Check your emails, segen droped their credit limit. Meanwhile stock available from some suppliers is on the increase, over a grand for an inverter thats normally £800? Order ive got on with one supplier have removed the panels from my order! Good job i checked. Its not even monday!!!!!!
  8. M

    2 strings minimum number of panels.

    We have been asked to design a system 14 panels on South 2 panels on West. What is the minimum amount of panels on one string? Not convinced that west panels will get enough daylight to activate? Novice123
  9. S

    Strings: 1 x 12 or 2 x 6?

    Quick question....Have install with very slight shading early and late in the winter/autumn only. 3000TL with the 2 x MPPT split 2 x 6 or 3000TL/HF with 1 x 12 string? Question really is does 2 strings x 6 modules compare with one long 1 string x 12 modules? Yield v similar on Sunny Design but...
  10. B

    Two strings, inverter question.

    I just picked up a 3.9 kw kit, 20x 195w panels. When The seller saw my roof layout he informed me the inverter that was with the kit would not be suitable as the instalation was spread over two roofs at right angle to each other. The lay out will be 7 panels on the smaller roof and 13 on the...
  11. J

    what to charge to commistion a pv system for roofer, thoughts on solar tiles

    Hi Guys, I am newly MCS accredited and have had a roofer approach me and ask me to install and commissiong a pv tile system(tiles are c21e solar tile, from solar centuray). It has 2 invertors, one invertor for18 of the tiles at 47 watt each and the other invertor for 12 tiles at 47 watt...
  12. 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
  13. G

    Two strings at different orientations

    I'm looking at a job which could have 6 250 panels on a South face and 10 250W panels on the East face. Is it okay to use a SB 4000TL for this? Will these seperate strings affect each other adversly or can this inverter allow the two strings to work independently? Thanks again for all the...
  14. 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...
  15. J

    1, 2 or multiple strings??

    ...please go easy on me I am new to this :D! I have just passed my MCS and am actively pricing my first 2 jobs. I'm doing a bit of research before I appear before the enquirers. Both systems are fairly large for domestic; 3kw and 7.5kw. I haven't even started looking at the larger one. My...
  16. N

    Three Phase install,3x sma inverters.With G59 relay

    Proposed Install Inverters are sunny boy SMC 9000 TLS-20 Each inverter has three strings of 14 230w = 126 modules The system is around 28KW G59 Protection is required. I was thinking of wiring each seperate array with the 3 strings in a junction box in paralell to each inverter so only one dc...
  17. 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...
  18. C

    2 strings, 1 dc isolator?

    :o Scratch that. 4 pole.
  19. 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?
  20. SolarCity

    Seperate strings with single MPP tracker inverters

    A pretty fundamental question I have here.... I was under the impression that the effects of shading could be negated slightly by using seperate strings, even on inverters with single MPP trackers. However, speaking to a rep earlier, he told me that seperating the strings would have zero...

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