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Showing content with the highest reputation on 08/02/2020 in Posts

  1. It is difficult to motivate solar financially. Even more so when you're slaving away 12 hours or more per day. And you will have 64 cloudy and rainy days every year - just plan your solar maintenance for then .. Its rather like buying a car - difficult to motivate the purchasing price when you're a male (but boy we're good at supplying reasons why we must buy a certain model lol). Unless you do it when you're young and you'll be living in the same house till you die, payback is not going to happen. Its all about convenience and security and looking after your family. And when Eskom goes on stop off course.
    3 points
  2. Bobster

    Basic UPS system

    When I got my system, initial calculations suggested a 9 to 10 year payback. Which is not the whole truth because round about then I'd be having to replace batteries. But I think that as the price of power climbs (and it will) we get into a window where one can see an eventual payback (whether that would beat what the money would have done in a savings acct is another matter). But as @Johandup says there is the soft value too. What is it worth to have uninterrupted power, to know that you are not going to lose the contents of your freezer (as has happened to us twice because of long municipal cuts)? These things are harder to put a value to, but they are worth something. Yep! Same in Joburg. I'd have to convert from pre-paid to FIT, which means a flat fee every month, a special meter (at my expense) and then they pay you something like 45c per kw/h. There's no way I can justify it. If it was just putting the system into export mode I'd take the dribble of income, but with the extra costs I can't make it pay. As you say, it's almost like they are discouraging it. I think this is to be expected. Any utility will see solar systems as a loss of revenue. Why then should they reward you for depriving them of income they need to maintain their system? I have a solution for me, but I may be part of a bigger problem.
    1 point
  3. I cant give any technical explanation, my knowledge is insufficient. My problem was that the batteries would turn off despite (according to portal/EZ manager) there being plenty of charge. Was this the batteries actually going flat or the inverter somehow losing track? I dont know. There is a setting which allows the inverter to "kick start" the batteries, but only when there is PV power. The modified configuration has an extra box with the input side connected to the Revov BMS and the output side connected to the Goodwe. This has introduced a new, occasional problem - sudden changes of SOC. See attached image which shows SOC suddenly going from 78% to 100%. I think the 100% is a false reading, because the next morning the system halted, then restarted itself. <shrug/>
    1 point
  4. I'm Sure you are spot on at 125A DC fuse for 2 Pylon 3.6KW
    1 point
  5. daniemare

    Basic UPS system

    FIT is a joke. At R250 odd meter reading, which is 25% of my consumption bill, its as if they do not want you to feed in. Thanks Johan. Starting to realise that. Just funny how every solar website touts savings as this big motivation factor.
    1 point
  6. It's only on cloudy days that it might matter. You can wait and see if you get premature float on cloudy days, and if so, drop setting 02 to 30 A.
    1 point
  7. daniemare

    Basic UPS system

    Base UPS system Victron 12/1200/10 R11000 Omnipower 240Ah R7000 Install and other 25% assumption (hence my question) Total R22,500 Solar System Victron Multiplus II 3000 GX R20,000 MPPT Bluesolar 150/30 R4,500 Pylontech US2000 R15,000 Solar Panels (6x300W) R12,000 Install and other 25% assumption (hence my question) R65,000 Difference R42,500 The Calc I use 588kWh per month of which I assume 14 is during sunlight hours per day (averaged over year - Stellenbosch) Now if I self consume 60% of that or +-250kWh at my marginal municipal tariff of R1.90 for that bracket I save R475 per month of electricity costs If I use my bond rate of 9% as my cost of capital, and I assume an Eskom increase of 12% per year I work out a return adjusted payback period of 8 years. Now I do not even think my solar option of R65k is realistic any more the more quotes I get. So the payback is starting to look even worse. Maybe I was just unrealistic about what these things cost. But thanks for the input
    1 point
  8. I had the same issue with another inverter brand. The electrician then did the bond on neutral and earth (apparently this is common practice). According to the electrician it is illegal to have higher than 20v(If I can remember correctly) on the neutral. ( I am not an installer or electrician just sharing what happened during my installation) Have a look at this Goodwe installation video : (take note at 03:10)
    1 point
  9. gooseberry

    DC changeover switch

    This article explains it better. It seems there is something like this and it's called a DC transfer switch. https://www.solarpowerworldonline.com/2016/03/using-a-direct-dc-transfer-solution-to-better-back-up-solar/ I'm also told the Axpert can't be connected to the DB in any way, is that true? Would I need to install a separate charge controller?
    1 point
  10. Keep an eye on i-G3N. New to the game but geared right to take on Pylontech etc. Forced to bring in cells from China due to price. Local manufaturing is about 2-3 years behind but let's see if we can change that...
    1 point
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