efficiency

  1. telectrix

    quick rule of thumb, 3 phase current

    now this is not exact, but comes close. say you have a 3 phase, 400v motor, given the kW, to get an approx. value for the current per phase, (can be done in your head), just multiply the kW x 1.5. e.g. a 20kW motor. I = 30A. ( not allowing for efficiency, pf etc. ) just to give a rough idea.
  2. V

    World's Top 50 Monocrystalline Solar PV Modules

    Worlds Top 50 Mono-Crystalline Solar PV Modules Based On Efficiency - June 2011...
  3. E

    rewire of house and energy efficiency

    Im rewiring a 3 bed house at the moment. I've been told by another sparks that the kitchen spot lights will need to be low energy to pass building inspection? Is this true or is it just a wind up?
    • egginyourface
    • Thread
    • efficiency energy energy efficiency house rewire
    • Replies: 14
    • Forum: UK Electrical Forum
  4. SolarCity

    CRC energy efficiency scheme

    Has anyone had any experience of this scheme and considered how it affects the PV industry? My understanding is that companies will have to pay £12 for every tonne of CO2 that they use. It seems to me that this is not a fat lot at all and largely insignificant if you were factor it in to...
  5. T

    Highest Wattage Panel You've Seen

    Whats the highest wattage panel you've seen? and by who if you can remember? seen some Chinese ones at 400w and wondered if any of more well known ones have bigger output than 250w or some in the pipeline for release at future date. Might help for future planning.
  6. Mark42

    Panel efficiency: Why does it matter?

    I’ve been comparing various makes and models of PV panels for an 8kW project. Sales people keep on and on at me about this or that panel being ‘more efficient’ than some other, so is obviously worth the extra cost. My understanding is that the efficiency of a panel is the rate at which it...
  7. T

    Latest From Greg Barker Comments on Energy Efficiency Requirements

    Fairly lengthy article from Greg Barker here: Solar energy industry may be on threshold of an exciting era | Greg Barker | Environment | guardian.co.uk Little concerned about his comments on the Energy efficiency Requirements: " We really shouldn't be offering a costly subsidy to people to...
  8. P

    Solarmax Efficiency figures...confused

    ...basically, I note the datasheet has Max Efficiency Figures and European Efficiency figures. Can anyone explain the difference? Thanks Newb
  9. K

    Trade mags

    Afternoon all, I just pased the 2399-11 and I'm left with more questions than answers :( Anyone know of any trade magazines for products/jobs etc. Any trade shows coming up? Is the InstallerLive at the NEC a little too plumber based. Lastly, how the heck do I learn to do an energy efficiency...
  10. G

    Panel efficiency, an explanation please

    Could anybody please explain the relevance of panel efficiency in real terms? e.g. Sanyo H series 250W panel - 18% efficiency Sharp 250W - 15.2% efficiency Mitsubishi 250W - 15.1% efficiency 16 of either of the above panels would give me a 4kW system so where does efficiency come into play...
  11. J

    Thinking of teaming up to reduce hassle, improve efficiency. Interested?

    Hi, If anybody out there is up to their necks in MCS admin and would like to focus more on what they can do best, i.e. designing great solar PV systems and running an installation team, then we should talk. From my experience of how the PV market went in Germany, France and Spain after Feed In...
  12. L

    another perspective on comparing different brands of panels

    So having had a bit of time to play with a loaned laptop running PV Sol I decided to analyse some 4 kWp systems using differrent panels all using an SMA SB 4000TL inverter. Here's a summary table. qty panel watt kWp PV Sol size area theoretical PV Sol % efficiency efficiency 16...
  13. Spoon

    IEC 60034-30 Standard on efficiency classes for low voltage AV motors

    Hi people. This came into affect on 16th June 2011. I did a search on it here, but nothing came up, so I thought I would post some info.
  14. W

    Extractor cooker hood efficiency

    I am about to fit a cooker hood with extractor. The vent is some 12 feet from the hood; one bend only. Can someone tell me what capacity (cubic metres per hour) of fan would be required to "blow" that distance? Thanks in anticipation Will2
  15. S

    Black Suntech Panels

    Anyone know where I can source black Suntech panels?
  16. G

    How to use efficiency figures

    having a lot of trouble reading the tech sheet on panels. If a modules efficiency is 14.3% and another is 14.7% how many Watts extra is it likely to produce under STC? is there an equation for this?
  17. W

    What size are you quoting on DNO forms - Peak or Instantaneous output?

    Had a meeting with One of the northern DNO's today and they were as helpful as ever, we were actually talking about over 50kw but this question also applies to the 3.68 to 4kw range. On the ENA DNO application form it asks for the net plant size - what are you filling in for this figure? as I...
  18. S

    Average Annual Power Output per pound spent vs Panel Efficiency

    I am in the process of getting quotes for a PV system of up to 4kW for a house located 35 miles SW of London, and have been looking at various manufacturer's claims w.r.t. performance. The primary data that I seeing presented are: maximum panel output panel efficiency, albeit no satisfactory...
  19. S

    Panel Degradation

    Can anyone explain the impact of degradation on panel efficiency please? I'm struggling to understand why the Schott panels are better than others with amonia when they are less efficient. Ie Schott 230 13.7% ish and Sharp 245 (when certified) 14.9%. Surely if the sharp panels are 1.2%...
  20. F

    Efficiency of Roof Tiles

    Hello All Anyone had any experience with efficiency of roof tiles, is anyone currently monitoring a roof tile system, and is it performing well? does the initial cost ever outway the return... Regards David

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