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Thank you for the great forum, Safe Driving over the weekend. Sincerely Jason


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  1. Thanks for your replies gents. I tried both the 68k & 135k resistors....both work ok and I cannot see any difference in brightness of the LED. Did not use a cap.or diode! Why do I need these? I underrstand the reverse polarity of the AC supply but it seems to work ok without them. Comments????
  2. I have in the past driven a normal LED form 240VAC by using a resistor. Now I cannot find exactly what resistor value I used. However, one of my ref books gives the formula R=(Vsource - Vled)/Iled Does this formula work for 240VAC? Will a flashing LED work on 240VAC as well? If someone has an online reference to this subject I would appreciate a link. Thanks & "Dankie".
  3. Hi Mark and thanks to others for the replies. Interesting! I also have a 3ph farm connection but use very little power. Say about only 5 kWh/mth. However, I forgot to mention in my original post that there is also a "service" fee of R14.50/day. Still, I do ok out of it because I export about 1000kWh/mth so after all costs come out the utility deposits about R1500/mth into my bank a/c.
  4. How much in round figures do you folk pay (per kWh) for your grid supplied power in SA? Here in Oz we pay around A$0.30 (say R3) per kWh but with Federal elections just around the corner, the Gov't. says they will reduce this by 25%. Unlike with Eskom (I think??) our utilities are all now privately owned. Used to be Gov't. owned in the old days! We also get a Feed in Tariff of around A$0.20 for each kWh we feed back into the grid so that could well be affected if supply charges are forced down.
  5. The pricing of the Evac. tube systems in RSA is very interesting. Seems like you guys can get a 200L system supplied & installed for around R20k. That is only about A$2000. I had a new 200L system installed about 2 yrs ago on the East coast of Oz. and it cost me about A$4500(supply only), that is around R45k. Why the big difference??? Strangely, when I lived in SA in the 1970's the exchange rate was about the same.ie R1 = A$1. Given that now R10 = A$, I would have thought that the R had "devalued" but in fact some of your goods are much cheaper??? Hey "d3nominator"....I used to live in Alberton. How is it going these days?
  6. Thanks for the reply "Silver...." I had a look at that link but I think the scheme I am referring to was long before that. Say Late 1970's. Also, that Wiki link does not mention "pumped hydro" but maybe my poor old brain is a little confused....not difficult to do these days! Pumped Hydro is having trouble getting support even in Oz because it is a massive long term project and no Gov't. will start something that it's successor may get the benefit of. From what I see on this forum about the state of the power system in RSA these days a big project would have even more difficulty getting off the ground over there???? See this...interesting? https://www.abc.net.au/news/2019-01-30/snowy-hydro/10683112
  7. About 40 yrs ago a Civil Eng. friend of mine was working on a "pumped hydo" scheme somewhere just south of Durban. I have lost contact with that friend but I was wondering if that scheme ever got up and running and if so what were the results. There is a lot of talk atm about pumped hydro in Oz but to date I don't think much has happened. It does seem like a good way of storing offpeak PV or wind power for use during peak times. Like in RSA, we are short of water at times but surely with a pumped system there would not be a lot of wastage as the water could just be recirculated. Even salt water??? Thoughts/comments??? Cheers. Bill.
  8. Hi "TT", More details please! I have a BMV702 installed so I guess you are referring to the "relay" function in that unit?? I have been toying with the idea of using that relay to switch on/off a small home built HWS (geyser in SA taal). I have an evac tube heater but after a day or two of cloudy weather I have to turn on the inst. LPG water heater. Whereas the 1410AH batteries are already fully charged by midday, even on cloudy days, so I could be using the excess PV power to heat water???? Thoughts?
  9. Hi Chris....thanks for the reply. I did change the tail current seeting to 2.8% and yes, it made the SOC reading more accurate. In the overall scheme of things it doesn't really change the performance of the system. It just makes the SOC reading on the 702 a little more in line with the SOC shown on the XW8548. Cheers for now. Take care & all the best for 2019.
  10. Many thanks to those that replied. I think I now have the general picture..... Just as a rough comparison....given that A$1 = 1R (don't know what happened????I think when I was there they were roughly the same!!!) The domesic power price here in NSW is around 30c/kWh and I get paid 20c/kWh for every kWh I feed back to the grid. Connection fee is around $1.40 per day. The feed in tariff was originally 66c/kWh so since installation in 2010 my 10kW system has returned around A$58,000 but of course the purhase price was a lot higher then. (about A$45k) It will be interesting to see how FIT's go in the future as more and more peoiple install solar PV's.
  11. No replies???? Very srange! I must be asking the wrong questions. Surely I haven't offended the forum members after only 3 posts???
  12. It is a long time since I was in SA....I went there for a 2 week holiday in 1972 and stayed for 7 years.I still have many great memories of my times there around Hillbrow!!! Just a few general questions re electrical power in SA.... Does SA have feed in tariffs? (ie payment for power fed back to the grid) If so, how much per kWh? Cost of power purchased from the grid? Is Eskom still the only supplier of power?
  13. Mornin' Jaco, Thank you for the prompt and informative reply. I think that this solves one of my other queries I had with the BMV702...it was showing 100% charged whilst the XV8548 had only 3 or 4 of the five LED's lit. Five is fully charged!!! That meant that the BMV702 was indicating full charge too early. Not that it mattered all that much in the overall scheme of things. I will monitor the system and see exactly what has changed now that I have reduced the setting from 10% to 4%. Cheers. You have a good day.
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