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NigelL

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NigelL last won the day on January 30

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  1. South African Standard SANS 60364-7-712:2018 (which is based on the international standard IEC 60364-7-712:2017) - titled "Low voltage electrical installations - Part 7-712: Requirements for special installations or locations — Solar photovoltaic(PV) power supply systems" does not have any requirement for metal conduit. Section 712.522.101 states that "All non-metallic cable management systems exposed to sunlight shall be of a UV resistant type" I think that SANS 60364-7-712:2018 is likely to be the "applicable regulation" on this issue, but I am not 100% certain.
  2. For some useful info on solar panel performance, based on installation angle, orientation and your location, see https://www.pveducation.org/pvcdrom/properties-of-sunlight/solar-radiation-on-a-tilted-surface Edit: This page is probably more useful - https://www.pveducation.org/pvcdrom/properties-of-sunlight/calculation-of-solar-insolation
  3. The City of Cape Town introduced a second Feed-In tariff that is a bit more user-friendly - see the "Residential Small Scale Embedded Generation 2" in the attached document. This works out at R85.00 more than the standard monthly "Network Access" fee, so you need to feedback 108kWh/month or roughly 3.6kWh/day to offset this increased fixed cost. The only way this will work to your financial advantage is to maximise your feedback during summer months to try and offset your increased usage during winter months. Remember that you cannot be a net-exporter over any 12-month window.
  4. Honestly, I think they forgot about my application until I followed up with them in September. They quoted me a 2 week turn-around for a decision on the permission to install, in May. I was not in a hurry for the paperwork since the installation was already "completed" prior to the application . The City of Cape Town require you to sign a "Supplemental Contract" that basically lays out the rules and options available. Max inverter power Power Export or Non-export options Bi-directional energy meter (if exporting) Costs and Tariff structure (depends on whether one
  5. Another point to keep in mind is that PV Panels generate optimal power in sunny and cold conditions, whereas solar water panels work best when it is sunny and hot.
  6. The summary version: May 2019. Submitted my application September 2019. Inspection of premises October 2019. Sign and hand-deliver the required "Supplemental contract" October 2019. Permission to Install letter received. Feb 2020. Commissioning approval letter received (dated Jan 2020). I think that this would have gone a lot slower had I not followed up/queried the progress.
  7. Victron definitely support BlueNova batteries - see https://www.victronenergy.com/live/battery_compatibility:start . BlueNova batteries, with newer BMS firmware, also support the DVCC feature - it works well on my system
  8. Reminds me of the following XKCD webcomic
  9. It looks like sustainable.co.za also do higher-power versions which have higher-capacity batteries - e.g. https://www.sustainable.co.za/sustainable-1000wh-power-box.html
  10. If one has extra space in the DB, one can install an extra changeover switch so that the non-essential loads can be switched over to the Inverter Output. You must then carefully manage the loads so that you don't trip the inverter, but this could be really helpful in the case of an extended power outage.
  11. This is true if one uses the transfer switch in the Multiplus-II, however one does not need to do this. You can always use the alternative method shown below In this case the Non-Essential loads are not limited by the 15A breaker and you can still make use of the full 5kW to Essential loads if needed.
  12. Hi OCD75 The BAT terminal on the Shunt should be the only thing connected to the Battery Negative. All other "negative" connections (loads, chargers etc.) must be connected to the "Load" side of the Shunt. If you don't do this, the BMV712 shunt cannot properly measure current into/out-of the battery - and will then give an erroneous reading for the State of Charge.
  13. This reminds me - do check that your probes are not plugged into the mA/A/current-measuring input on the Multimeter! This will do a bit more damage than leaving a black mark...!
  14. This may be useful... https://lamphq.com/led-lights-glow/
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