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Showing content with the highest reputation on 11/04/2018 in all areas

  1. 3 points
    ibiza

    Multi strings

    That's what the slaves are for, aren't they?
  2. 2 points
    Here we go sir: http://stel-apps.csir.co.za/wasa-img/WIND_ATLAS_GUIDE.pdf If you get a bit stuck with the Google Earth Overlay give me a shout. I struggled a bit to get it working. It is amazing though. You can zoom in any where. It is however only for WC I believe. Gents if I may promote my business after 5 years of keeping the forum up. hahah. I am a Pilot and I love any thing Propellers. I love wind Turbines. I am at www.pegasus-systems.co.za and some videos at : https://www.facebook.com/pegasussystems/ Wind Turbines are my passion. I see them as battery savers in the night (too Avoid deep discharges) and also very useful at the coast and valley mountain areas. I never recommend them if the ROI is to high when taking into account the saving on Battery and so. I am terribly sorry for promoting my own business. Its against my ethos. But I love them very much. My margins are slim :>> . Dont go Zohaan! Go Pegasus! These machines are built for 20 years , with normal maintenance. Thanks guys for letting me post this. Sincerely Jason
  3. 2 points
    been there...... Waited till sunset to test but there was still enough juice to give me an impressive arc. The staff on the farm were very impressed - "Yoh - uyachokka"
  4. 1 point
    ibiza

    Multi strings

    I will continue as soon as weather clears
  5. 1 point
    pilotfish

    Multi strings

    I am sure that Chris is aware that the joke didn't refer to his wife. It would still be very valuable if you could carry out the early morning, midday, mid afternoon test on your current setup while ensuring that all arrays are full capacity - it would settle a lot of assumptions that have been made over a long period, my own included.
  6. 1 point
    If you really want to do that (and I don't think you do, but I'll explain below), then you simply put the whole house on the inverter output. Depending on what your present distribution board looks like this might be easier than the other way round, because you literally connect the council supply to the input of the inverter (with the required fault current protection devices), while the output of the inverter simply feeds the existing DB. The distinction on these hybrid inverters are quite simple really. Anything that is on the "output" of the inverter stays up when the grid goes down. Anything that is on the input side might benefit from power fed back out of the inverter, but goes down when the grid fails. Picture time. This is for a Victron inverter. The principle is the same, in this instance we're supplementing the grid using a battery. You can connect PV panels to the battery to feed PV into the grid: That is what we normally do. It is not important, as long as you get the principle. We call the part I marked in red the backfeed relay. The black box bottom right is the inverter/charger component. As you can see, during normal operation the three are tied together. Battery power flows both to the right (those are the essential loads) and to the left (those are the non-essential loads). The amount that is drawn from the battery is regulated so that it matches the consumption in the house. If the grid fails, the backfeed relay opens. The loads on the right will stay up, anything connected to the left goes down. Now, I said that I don't think you want to put your whole house on it, and here is why: Some big items should be left on the grid side. Heat pumps, geysers, swimming pool pumps, maybe even air conditioners (unless they are inverter models), I consider those non-essential loads. Leave them on the grid side. In a single-phase house this is usually fairly easy. You choose the circuits that you want to stay up (lights, your entertainment area, home office), then you split the distribution board (you install a new one for the backup circuits in other words) and you put the inverter between them. In a three phase house I can see that this could be somewhat harder. Rather than convert everything to single phase, I would much rather group my essential loads onto one circuit and one phase, assuming this could be done in a balanced manner. Hope that helps.
  7. 1 point
    pilotfish

    Multi strings

    I hope nothing serious and all goes well. The test is very interesting and the results from the disparate string are better than I expected, but there may be a problem with the test method; I have noticed with my 2 parallel Axperts that while at full PV capacity their PV output is identical (which I assume is the max output from the identical arrays), but when output is being restricted by the load then the Master is often 5-10% lower than the slave. So results may be impacted by the MPPT while not at full PV capacity. In order to avoid the above it would be necessary to bang on some heavy loads before recording test data to ensure that the arrays are being fully driven, that way we would know that the MPPT's are pulling everything available from the 3 arrays.
  8. 1 point
    Chris Hobson

    Multi strings

    My wife is in hospital for tests and I am in a strange place with a strange bed. Put my son to bed and went to sleep shortly afterwards but man cities are noisy. The losses caused by the disparate array seems more than made up by the early morning production. This is valuable information and monitoring for a couple of days would give a clearer picture.
  9. 1 point
    plonkster

    Solar Panel - Roof Mounting

    This is the last one I made, to fit 3 x 300W modules side by side. 8 Hanger bolts going into the beam below. Aluminium frame from angle-aluminium. That's just over R1000 worth of aluminium you see there. The hanger bolts was around R300. Bolted together with stainless steel bolts, and I have a aluminium rail (got it at OnTrack) on top with the standard little twist-in nuts. I already own a mitre saw with an aluminium blade though. That makes it super quick to build things like these.
  10. 1 point
    ibiza

    Multi strings

    we simply couldn't stop chatting! As you can see @Chris Hobson is still slipping. It was very interesting subject we were discussing.
  11. 1 point
    pilotfish

    Multi strings

    What interests me is WHY were you both at your PC's at 3am to have this conversation?
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