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GreenFields

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GreenFields last won the day on March 8 2019

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  1. I'd guess at that point you need to start looking more critically at the melting point of materials you could use in the construction of the turbine and piping (steel 1500C, copper 1100C), or at least what stresses the materials can withstand at that temperature, and for how long.
  2. Is it overly nitpicking to argue that this is exactly NOT helping anyone to move off Eskom's grid, but to increase the size allowed that private entities can connect their power sources WITHIN the grid? Also, this is of no additional benefit to households if the current limit is 1 MW. That's 1,000kW, and if we use this Goodwe ES 4.6kW inverter as the benchmark size for home installations, that's already over 200 times bigger than the typical home installation. Increase the limit tenfold, and clearly you're only benefitting medium to large-scale businesses, except if you mean that househol
  3. Search for some info on PV losses due to incident angle or the sun, panel orientation, wiring, connectors and environmental conditions. The rated wattage is under ideal circumstances only that may never be reached in your circumstances.
  4. Just a half-thought. Will your battery only ever be supplying the critical loads of 200-300W? It should be no issue to drain the battery every evening for 7-10 hours to supply the critical loads. But will it ever be supplying the crypto mining rig in the evenings in the circumstances where you have no solar power, but no power outage? If so, I would just look at the power demand of the mining rig compared to the power that the single battery can supply. You don't say how much power the rig draws, but the panel capacity of 4440W to supply the crypto rig is probably more than the single bat
  5. Some related reading here: https://powerforum.co.za/topic/4991-dc-changeover-switch/
  6. Good grief, sorry, had my Easts and Wests reversed. But yes, same thing. Slightly less production earlier in the morning, more production later in the afternoon, peak later in the day, and overall lower production than if pointed Northwards, in the order of maybe 5% lower. Just rough thumbsuck.
  7. If I'm understanding the 340 degree angle correctly, the panels are pointed twenty degrees East. So if the sun rises in the West, early in the morning, until it gets high enough in the sky, the sun will be shining into the back of these panels. The jump is likely the moment they don't just get light reflected by the atmosphere, but direct sunlight.
  8. Layman's 2c. You don't have to use all your appliances at full rated power during loadshedding. If needs be, a microwave can be operated at a lower to medium watt setting like 600W, and without the grill function. A washing machine can be operated at a cool temperature, on a short cycle, or at a lower spin speed than maximum. And the iron can be turned to a lower heat setting. Why replace perfectly good appliances? As said above, be careful with the rated power of the battery; be sure it can handle the power draw when solar is insufficient, because there will be partially cloudy days where you
  9. Maybe start from the ground up and check how much hot water your household actually consumes and when. Everytime you empty the geyser and heat the incoming cold water to temperature, say a 3kW element running for 1.5 hrs, that's 4.5kWh. If you for argument's sake run two or three large hot baths baths in the evening and maybe a handful of 15-minute showers in the morning, and add in 2kWh for standing losses (heat radiated to the atmosphere - better geyser insulation like a geyser blanket can help you only so much), that's quite plausibly approaching 18kWh average per day. With that theoretical
  10. It seems like a logical step towards splitting Eskom into separate entities for generation and transmission, to have a separate charges for energy and for network access. I think they should have led with that, because EVERYONE loves the thought of seeing Eskom's monopoly broken.
  11. Thing is, I don't really know the finer interpretation, and I'm cautious to give any advice other than: speak to your municipality and get it from the horse's mouth. My own experience is from having a pure grid-tied system with export that's safely within all limits. Generally, if you have a 60A circuit breaker on your house, you may not export more than 3,5kW (3500W) into the municipal grid. But if you have 6x410W array, that's just a 2460W max output, so that shouldn't be a problem. Also, if you have a 3kW hybrid inverter, and I mean a "true" hybrid grid-interactive inverter that export
  12. Basic random thoughts that can hopefully get you started. Start with assessing your electricity needs. How many units (kWh) do you use per day, throughout the week or over a month? How much in winter vs summer? At what times of the day? If you don't have it measured, track back through the last year's bills. How is it likely to change in the future? Can you optimise any household consumption before buying panels? Consider the aesthetics of upgrading with newer panels in the future that may not match the look, specs, size or age of what you're getting now. Will you be going off-grid,
  13. On the surface it would seem so, but don't take my word, I am by no means an expert, just another customer, so rather contact the municipality or an installer for their view. Agreed, the time-based crediting can be tricky, but don't just look at daytime vs nighttime use. Rather look at the entire week's time-of-use cycle (including summer vs winter times), and try to see whether you can match a generation period to a consumption period. For example, the week's evening off-peak consumption could be offset by feeding into the grid Saturday afternoon and all of Sunday. And the evening peak
  14. That might be your issue right there. At peak sunlight at midday you've got only 12x345W angled towards the sun. The other inverter with East and West-facing panels will spread your generation to the morning and afternoon, which is useful if that's the time you need power, but it reduces your peak and total generation. Also, if those 6 West and 6 East panels are on the same MPPT, you may be reducing your output further.
  15. To add to that, while the solar power idle during the day, already on this graph the battery capacity is not sufficient to carry you through the evening, running out and switching to grid at around 4am. Perhaps the best thing is to ask what of the evening loads can be shifted to the daytime so you don't have to draw that 2kwh from Eskom? One laundry load on a timer? Divert solar power to heating the geyser? Or possibly find ways to use power more efficiently at night? If you're adding for winter, mixing is not ideal. Panels should be ideally the same or very closely matched, or you won't
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