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Showing content with the highest reputation on 26/01/2018 in all areas

  1. 3 points
    SilverNodashi

    Panel (Array) ventilation

    Not saying it would be too expensive, but would you risk burning some panels which got too hot? It has happened before. Those diodes, the soldering and even the silicone wafers can only handle a certain temperature. Normal electronic components normally have an upper operating limit of 80 degrees celsius.
  2. 2 points
    SilverNodashi

    Panel (Array) ventilation

    That alone is a no-brainer to me. Proper mounting structure is expensive (as have been discussed many times on this forum in the past, by many people) but it has a very valuable purpose in your expensive investment.
  3. 2 points
    plonkster

    Panel (Array) ventilation

    Solar panels mounted far from the roof, such as mine that is tilted 35 degrees up from a flat roof, already operate well above 50 degrees Celsius in full summer sun. There is no reason to want to make this any worse. But from another angle, I manufactured my first two frames from steel, and the third one from aluminium with proper extruded rail. Yes, the third frame was about double the cost of the first two, but I will never again use steel for this. I will in fact go back and replace one with aluminium soon.
  4. 1 point
    SilverNodashi

    Panel (Array) ventilation

    I see this "cheap mistake" all over. Aluminium is expensive. Extruded aluminium even more so. And anything solar related just takes the cake. But you need to decide whether you want to remove, and repaint the frame every year or two, and possibly replace bolts & nuts every few years, or just let the proper stuff do what it's made for. P.S. Not aiming this at you, @plonkster
  5. 1 point
    plonkster

    Current Water Affairs.

    Dude, dignity is in our constitution. You'd get smacked even harder than those doodkis guys (still don't know what the heck they were thinking 1) doing it, 2) filming it, 3) distributing the film...).
  6. 1 point
    This lady, had the penny drop for here: https://brettfish.co.za/2018/01/24/day-zero-approaches-water-going-meet-shanas-realisation/#iLightbox[gallery20284]/null I smiled at this: "... combine a shower, hair wash and condition, teeth wash and leg shave all just using 5l of water." My sense of humour: - Shower - wet wipes, you can afford it - R0l of water. - Hair wash and conditioner - dry shampoo, you can afford it - R0l of water. OR shorter hairdo. -Teeth wash - swallow the water, ooo, you can't, toothpaste is bad for you, change that, you can afford it - R0l of water. - Leg shave, electric shaver, you can afford it - R0l of water. Total water used: ZERO! BUT, she does highlight a EXTREMELY important matter: “However, we have set our own higher target of at least: – one shared toilet to maximum of five households; and – one tap to 25 households and within a maximum walking distance of 200 metres.” Taking the above two things she realised, we are worlds apart. We being the affluent homes and the people living as above. We scamper for saving a few liters, spend thousands on water tanks and systems, yet we are not even CLOSE to the above savings. Therein the DA's plight, the inaction, the drawn out plans, the scrambling for solutions, not knowing what to say and what not, dealing with people worlds apart, different opinions, life experiences, expectations. To merge the worlds of all living where water is a problem in the Western Cape, is a near impossible task without very strong single minded leadership, autocratic even, for we are nowhere CLOSE to "Unity Creates Power". And if ANYONE think it is just one group causing the problem, think carefully on that. There are idiots blatantly wasting precious drinking water in all the people groups making up the Western Cape.
  7. 1 point
    YES! That I can also agree to IF the install is R3k or less.
  8. 1 point
    Chris Hobson

    Panel (Array) ventilation

    My feeling is that over the lifetime of the install R1-3k extra on the install will pay for itself in the extra efficiency.
  9. 1 point
    Not saying it won't make a difference, it will, but what is the exact number to justify the additional expense. So, it boils down to: It IS better to have them well ventilated, kept as cool as possible. But, if you have already mounted them, does it justify the cost to change, closing the holes in the roof and all the other little bits? Or would it be better to get another panel or two, mounted with ventilation? My panels are on adjustable frames (no, it is not worth the risk of life and limb on our roof) and they still get damn bloody in summer. It is a tough one.
  10. 1 point
    Yeah, I feel like this too, but people will say it's because the product I push is one of the most high end (aka expensive) of the lot and so OF COURSE I'll be saying that (or in technical terms, they commit a false dichotomy and assume that the only possible reason for my disagreement must be because I want to do them in financially). Then again, I'm not an installer, so I'm sure it's worse for you. I have similar issues with what I might call unbalanced setups. For example, an expensive inverter paired with crappy batteries (many many cringe-worthy strings in parallel). Or more often, an expensive battery paired with a very cheap inverter. The worst for me was a system where the battery was well over 100k, and it was rounded off with two Voltronics in parallel. Now this isn't just me bashing Voltronic (again), the reason it draws my attention is that it seems the installer has a hammer (aka reseller account with UPS/solar supplier), and now every problem becomes a nail. If the nail becomes bigger, get more hammers to pound it with. Had a discussion with someone recently about some suppliers up North who sell Fangpusun charge controllers (Fangpusun's entire business is to make fake copies of other people's products). They are of course careful not to advertise it outright on their (very poorly) constructed website, but I'm told they distribute these things along with the Victron software and manuals. Let me just say... if you read this... we know who you are...
  11. 1 point
    Chris Hobson

    Panel (Array) ventilation

    @Chris-Rmounted ½ his panels 200 mm clear of his roof and the other ½ flush and there is a significant difference in production between the two strings. Unfortunately I cannot remember the exact figures.
  12. 1 point
    SilverNodashi

    Panel (Array) ventilation

    It shouldn't need justification. A client decided, 2 years ago, to justify the cost of the panel mountings. I think his roof is 30 degrees and face due North. So it's basically perfect. I saw him quite some time after that and he was upset with me for selling him **** panels (his words). Production is so bad during the day that he often still pays eskom to run his pool pump and the washing machine. I didn't see the installation, but did quote on a proper mounting system to lift the panels off the roof by about 120mm. He refused, price was too much. Today he's paying for it in another way. It took me a while to explain to him there is nothing wrong with the solar panels. They could perform as they are designed, if installed as per recommendations. @mohammedbera2 If you REALLY, really cannot afford it, don't do it, but the panels will get too hot to produce much energy. Anything beyond 25 degrees celcius will see degraded performance. My tile roof often sees temperatures upto 55 degrees, and 34 underneath the panels. That's too hot for my liking, bu I can live with it. It does mean though that I'm not getting the maximum potential from the panels. 25 degrees are optimal for any panel, though often difficult to achieve.
  13. 1 point
    The Terrible Triplett

    Current Water Affairs.

    Things you thought you’d never hear yourself say to your kids … and then you found yourself living in Cape Town in the Summer of 2018: 1. WHO flushed the toilet??? 2. WHY did you flush the toilet?? 3. Have I NOT told you to NEVER flush the toilet until it’s ABSOLUTELY necessary?? 4. Please lick your plate clean! 5. We washed your hair a week ago, let’s give it a few more days … 6. No, you may definitely not shower/bath, you swam this afternoon! 7. PLEASE pee outside! 8. What are you doing washing your hands like that? Haven’t I told you to rather use the wet wipes? 9. Your face is fine, no need to wash it, nobody will notice the smear of Bovril on your chin. 10. You’d better finish all the water in your water bottle today, otherwise you’ll be drinking it again tomorrow! 11. Those shorts are just fine, one more mud or grass stain will not make a difference. 12. Let’s just leave these smelly socks that you’ve been wearing all day out in the sun for a while, shall we? They’ll be good to go again tomorrow! 13. You’d better not scratch your mozzie bites and leave blood spots on your sheets, your bedding isn’t due to be washed for at least another 3 weeks! 14. No, you cannot go to your friend’s house tomorrow afternoon, there’s 1mm rain predicted and we need everyone to be at home to catch it! Have I left anything out? #CapeWaterCrisis #FindingHumour
  14. 1 point
    plonkster

    Current Water Affairs.

    Even your old Isuzu won't like that! :-P I get the general drift of your comment (learning to be less consumerist), but in terms of oil... back in those days, when your car had 50k miles on it (80k km), it would be starting to smoke, use some oil, you might actually consider overhauling the engine. Now our cars do half a million kilometers before we reach that point. Back in the day when I learned to change oil on cars, we serviced cars every 5000km, and under extreme conditions you'd double up and service every 2500km. I still did 5000km services on my '86 Jetta, but now... service intervals are at least 15k km, and I'm told that technically our oils have improved so much that at 15km we're actually servicing them more often than we used to. Also, I've since learned about PCV (positive crankcase ventilation) and the degradation of oil due to contaminants getting past the rings and into the oil. The main reason you change oil as often as you do is not because it's full of iron shavings as in the old days... you change it because the counter-acting additives that prevents corrosion are used up :-) In other words... unlike water... you really shouldn't be recycling oil into other engines :-)
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