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  1. M

    SunnyBoy 2000HF with 3.36Kw 14 panel string

    Hello, A friend of mine has just had a 14 panel 3.36kW system installed. When he described it to me I was surprised that the installed inverter ( Sunnyboy 2000HF ) was only rated for 2kW. Is this normal or even correct ? Many thanks Mike
  2. E

    Solar PV Surge Protection

    Hello This is my first post, I am hoping someone can help. I am aware that we need surge protectors/string controllers for large solar pv systems, however I have been informed that for any install over 3.78kWp we need them. Does this sound correct? I know there is quite a lot of confusion...
  3. P

    Number of panels per string

    Anyone help me I have 14 235w rec panels on 2 strings 7 per string but the inverter doesn't click on under normal light levels because of the voltage isn't enough per string can I put 8 panels on one string and 6 on the other to bump the voltage up for the inverter
  4. J

    Advice invited re: 4kW system with string or micro inverters

    Hello all I'd appreciate advice / views on a system we're considering having installed. We have a large roof with room for up to a 4kW system (faces 8 degrees east of south; 45 degree pitch; single expanse from first floor to ground floor level; rectangular lower section c10m wide, upper...
  5. G

    Extra string for pm topup + Quote for Bristol area ?

    This is my first post so please be gentle - Nice forum most comments seem helpful and positive. If anyone would like to comment on the idea of putting a third string on the northeast side of the below roof to topup the afternoon - i think for a short while during a summers day there would be...
  6. 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...
  7. 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...
  8. 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
  9. 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...
  10. 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
  11. 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...
  12. 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...
  13. P

    String vs Micro Inverters

    We've recently quoted a customer for a 4kW ground mounted array. The array location is unshaded and is 5m away from their garage which has a consumer unit fed from the main house. We quoted for 16 panels plus a string inverter which would be housed in the garage. Since our visit a competitor...
  14. 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...
  15. 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!
  16. 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.
  17. 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
  18. 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!
  19. 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...
  20. 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...

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