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

GerhardK83

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  1. Hi All I trust that you are all well. I have the following questions regarding the cable thickness and lugs size supported by the Axpert King 5Kva unit, the book is not clear in this regard. A] What is the maximum size of cable supported by the AC In connector block? B] What is the maximum size of cable supported by the AC Out connector block? C] According to the book the battery connections are made by lugs but they do not specify how thick the bolt is that is used to hold the lug in place, so I want to know how thick is the bolt that holds the lugs in place? D] What is the maximum size of cable supported by the Solar In connector block? E] How long must the wires be stripped for the AC In connector block to make good contact in the connector block? F] How long must the wires be stripped for the AC Out connector block to make good contact in the connector block? G] How long must the wires be stripped for the Solar In connector block to make good contact in the connector block? Kind Regards GerhardK83
  2. Hi @TheRoDent if the supply from the utility is multi-phase and the multi-phase supply is broken down into single phase supplies then it is fine with only an earth leakage per phase, as long as the load is only a single phase load. If the load is a multi-phase load and the load has bare metal exposed where one might get an electric shock if there is an electric fault on the load then there must be a multi-phase earth leakage installed for the multi-phase load as well. Usually what they do in multi-phase installations is they split the incoming supply from the utility up with 5 bus-bars 3P+N+E and from there they supply 4 earth leakages 1 3P+N and 3 1P+N all wired in parallel, if you wire the earth leakages in series and there is an earth fault then the 1 with the lowest earth fault current will trip first which might be annoying and or problematic. Your setup is correct because each of your single phase DB's are protected by a single phase earth leakage.
  3. Hi Jatho I would only mount fans in the top of the cabinet sucking hot air out of the cabinet. On the inlet side I would put a filter to filter out dust. A fan which suck air out of an enclosed area is much more efficient than a fan which blows air over an object. The filter does not need to be a filter which is specially made for the purpose I would look at Fram or GUD air filter or pollen filters that you can buy @ a car spares shop. Fram and GUD have online catalogues available where you can search according to application and size. http://www.fram.co.za/index.php/filter-query or http://www.gud.co.za/index.php?option=com_wrapper&view=wrapper&Itemid=109 or you can download the GUD catalogue with pictures and install it then you can view the filters as well. What I would also do is use multiple outputs of the nodemcu and a couple more relays and switch more fans in if the temperature rises in stead of all the fans running even at a low temperature. If the fan cooling is not sufficient I would look at the fan which they use for the blower in a car with the resistor pack then you can also control the speed of the fan according to the temperature inside the case or an electric radiator fan that you also buy @ a car spares shop. Do not be scared to alter or modify the cabinet to suite your needs, after all you want the batteries to last as long as possible and keeping them cool @ 25 degrees Celsius would be a good idea to extend their life by a year or 3 or even more. I would also look at insulating material to insulate the sides of the cabinet on the outside, a good insulating material that I found are these carton trays which they use for the eggs (as per the attached picture). GerhardK83
  4. This is a nice setup @Hannes Bester, please advise where did you purchase the solar panels and do you have more info on the solar panels - a datasheet of the solar panels perhaps?
  5. Good afternoon Tsa As per SANS 10142:2006 the maximum allowable current for PVC insulated cables in a single phase installation when the cable is enclosed in conduit fixed to a wall or trunking fixed to a wall are as follows. For Multi-Phase the currents are lower. For GP cable - That is the individual Black, Red, Blue, White, Yellow, Yellow and Green cables which are not bundled together with a second insulation over the individual cores and with 1 solid core or multiple thick strands 1.5 mm2: 17.5A, 2.5 mm2: 24A, 4.0 mm2: 32A, 6.0 mm2: 41A, 10.0 mm2: 57A, 16.0 mm2: 76A, 25.0 mm2: 101A For Surfix and Twin and Earth - A cable with more than 1 cores with 1 solid core or multiple thick strands individually insulated with a second insulation over the individual cores 1.5 mm2: 16.5A, 2.5 mm2: 23A, 4.0 mm2: 30A, 6.0 mm2: 38A, 10.0 mm2: 52A, 16.0 mm2: 69A, 25.0 mm2: 90A The maximum cable operating temperature are not allowed to exceed 70 degree Celsius, if the temperature exceeds 70 degree Celsius a thicker cable must be used. Cabtyre -A flexible cable with thin strands used for appliances, power tools, extension leads etc are not allowed in a DB. The gap between the clamp of the MCB and the start of the insulation may not exceed 2mm. There is also a limit of the number of cables entering or leaving an MCB and that limit is 3. Another point that is misunderstood is that the MCB protects the cable and not the load supplied by the cable. If a cable leaving the DB is joined and the cable that is joined is thicker or thinner than the other cable then the MCB must be rated for the thinner cable, for example a gate motor is to be installed and the cable leaving the house is 2.5 mm2 but you cannot get a 2.5 mm2 cable only 1.5 mm2 is available then the MCB must be rated for the 1.5mm2 cable. Circuits are not allowed to be mixed on the MCB's eg Lights and Socket outlets on the same MCB. Open spaces in the cover of the DB must be closed off so that you are protected from a electric shock and to keep insects, bugs, spiders, bees and wasps out of the DB. MCB's must be marked with indelible ink or a proper label which is not easily removed. If a DB is supplied by another DB then the sub DB and the supplying DB must be properly marked the same way MCB's are marked. A Switch Dis-connector (isolator) must disconnect both L & N for single phase installations and all P's & N for multi-phase installations. A 2 pole or 4 pole MCB are not allowed to be used as a switch dis-connector (isolator). A MCB must trip all P's for multi-phase installations if there is a over current in any of the phases. An Earth leakage must disconnect both L & N for single phase installations and all P's & N for multi-phase installations PS CB is short for Miniature Circuit Breaker.
  6. Thanks for the feedback @Chris Louw I will pm you shortly.
  7. Hi All I trust that you are all well. I have the following questions regarding the Axpert King and Kodak King inverters. A] If I purchase the Kodak King inverters will I be able to use the Axpert parallel kit with the units or must I use a Kodak kit with the Kodak King inverters? B] What is the length of the Axpert parallel communication and the current sharing cables? C] Is there an easy way of solar panel grounding? Kind Regards GerhardK83
  8. That is a nice setup @jaqkar, please advise what is the Ah rating of the batteries?
  9. Wow what a nice setup that you have there @Trober I have the following questions A] Where did you purchase the inverters, solar panels and the batteries? B] What is your daily load on the inverters (if you are monitoring the daily load)? C] Does the inverters communicate with the batteries?
  10. Thanks @Jaco de Jongh, at this stage I am only doing research after the lock-down then I can start making decisions of how many of what to buy.
  11. Thanks for all the feedback and valuable information @Jaco de Jongh, @plonkster, @RikH, @Richard Mackay. @RikH Dankie vir die voorstel ek kan hulle ook seker kontak en vra of hulle nie na SA toe uitvoer nie, ek is seker hulle sal Afrikaans verstaan. Die grappie is ook uitstekend.
  12. Hi All I trust that you are all well. I have the following questions regarding solar panels: A] What commercial mounting system would be recommended for a corrugated roof or is it better to design and build your own mounting system? B] When the panels are to be installed on the northern slope of the corrugated roof and the inverters and batteries are to be installed on the southern side of the residence what protection does the cables from the PV panels require to be protected from the elements? C] Is there an advantage when the PV panels are installed with a space between the roof and the panels of 300 to 600 mm? D] Is there a disadvantage when the panels are installed as in question C? E] How can you protect the PV panels against hail damage? F] Must the PV panels be earthed? Kind Regards GerhardK83
  13. Thanks for the feedback @Halcyon, I will send you an e-mail in the next couple of minutes and then you can respond with the recommended suppliers/installers.
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