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  1. G

    Retrofitting Solar Edge.

    only true if you have severe shading issues and a rubbish inverter to start with, otherwise performance improvements are more likely to be in the range of 2-5% due to variations in panel output and possible efficiency improvement of the inverter. I've ripped this claim to bits from both solar...
  2. G

    Need to pick some brains guys/girls

    I'd picked up that you were coming at this after installation design etc. In case it's useful, some inverters have relays that can be set at different levels of output, or possibly voltage, that could be used to trigger the contactors for the changeover to generators. Not sure if that helps or...
  3. G

    Need to pick some brains guys/girls

    ok so it probably won't be the inrush, but what happens when the sun drops behind a cloud? Is the generator still going to be running in parallel with the grid & PV? and is it able to ramp up to cope with that rapid demand increase? If not then you're going to be getting significant voltage...
  4. G

    PV+ - anybody heard of this?

    to be clear, is the inverter backfeeding through the VO transformer? IT looks like it may not be, and is simply taking the place of a henley block / distro board to make for a neater installation, with the VO unit only operating on the supply (from combined solar and grid) to the house consumer...
  5. G

    Wind Turbine Technician

    go for it, there's going to be guaranteed work in that field for at least the next 30 years just in terms of maintaining the tens of thousands of turbines that have already gone in.
  6. G

    Need to pick some brains guys/girls

    darkwood - my concern with that set up would be the potential for the presumably fairly large start up surge currents to cause sufficient voltage swings to result in the inverter tripping out. Those settings can be adjusted with the right codes, but only supposed to happen with DNO approval...
  7. G

    PV+ - anybody heard of this?

    I'm not arguing it's a major impact, just that there is some truth to it.
  8. G

    PV+ - anybody heard of this?

    tbf with the kettle example what they mean is that if it's being boiled when solar is generating then a longer boil time and lower consumption levels will result in the solar providing a higher fraction of the total energy used. Alternatively just buy a lower rated kettle. We've got a VO unit...
  9. G

    Moving solar panels for extension

    just find a local company to you, it shouldn't be an issue, they'll probably be relatively quiet at the moment anyway and glad of the extra work. It's not an issue for FITs, the only issue might be whether it still fits on with the extension, and if the inverter / panel configuration works with...
  10. G

    PV+ - anybody heard of this?

    if they're talking about using the VO unit between the inverter and the grid so the inverter sees the lower voltage, then this is completely against the regs, and would give the DNO the right to disconnect you. IT's bypassing the G83/2 protection settings that are designed to protect the local...
  11. G

    31st March deadline for FIT applications for systems with MCS cert issued <16th Jan

    Re: 31st March deadline for FIT applications for systems with MCS cert issued <16th J I've not looked, we've done that little of it in recent years.
  12. G

    31st March deadline for FIT applications for systems with MCS cert issued <16th Jan

    Re: 31st March deadline for FIT applications for systems with MCS cert issued <16th J innit. Apparently STA mentioned this in a briefing about the original FIT cuts from December so it was obviously intended to have been part of that original legislation, but DECC just forgot to actually...
  13. G

    31st March deadline for FIT applications for systems with MCS cert issued <16th Jan

    Leeds Solar have just become aware that on 10th March DECC slipped in a Statutory Instrument that takes effect today (31st March 2016) that results in the following urgent issue. All existing renewable energy installations with an MCS certificate issued before 15th January 2016 must submit...
  14. G

    South Wales (Cardiff) solar installer recommendations please.

    a fault that's tripping out the rcd is very different to one that's tripping out the RCMU on the inverter, as the RCMU is set to trip at 1% of the leakage current of the RCD.
  15. G

    On-Site Event Generators

    This is the sort of distro kit you should be using for events stuff, but seriously please get in a professional.
  16. G

    On-Site Event Generators

    this is relatively simple so if you don't understand it then I'd seriously recommend that you just appoint a company who does to provide both the generation and distribution requirements. Otherwise you're going to come a cropper one way or another, and your events insurance will be invalidated...
  17. G

    South Wales (Cardiff) solar installer recommendations please.

    it does, but the above still applies, if it only happens in cold weather than it's not water getting in to connectors. We've seen this issue so many times every winter, and panasonic / sanyo HIT are by far the worst for it. 1 Mohm is still a huge resistance to earth, it equates to around 0.3mA...
  18. G

    South Wales (Cardiff) solar installer recommendations please.

    is it only wet and cold weather? If so, nothing to worry about IMO, the inverter can be reset to 0.5MOhms. We particularly see this with panasonics, I think it's related to their increased capacitance due to having thin film and mono-crystaline cells. The clue being that it only happens in cold...
  19. G

    Quality of solar panels: quantifying the difference between "cheap" and "good" ones

    Re: Quality of solar panels: quantifying the difference between "cheap" and "good" on I'd be a bit concerned about their statements about the snail trails.
  20. G

    PV immersion controller

    erm er well, there is that to it. most of our fault report calls are related to elios / power reducers, they have a nasty habit of just dropping connection at random and being a git to reconnect. At least they finally produced a user guide for the connections side of things a bit back, so we can...

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