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Calvin last won the day on November 30 2020

Calvin had the most liked content!

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  1. Calvin


    I have used Banggood many times over the years, and can confirm that they work really well when using the SA Direct option. Avoid the SAPO option at all costs. The one negative experience was when I selected the "tax free" option. Buffalo Logistics still made me pay the same as I always do ("we cannot release without payment - take it up with your supplier"), and then used a terrible service called Pargo that required me to go and collect the parcel. In all other cases they delivered to my door using The Courier Guy.
  2. Maybe just a typo, but everything suggests that it is in fact a 16 x 3.2 cell battery. The 51.2 nominal voltage is 3.2 x 16, also 54V charging is far too high for a 15 cell battery.
  3. The physics is easy: the specific heat of water is about 4.2 kJ/kg. This means that 4.2 kW will heat 1 kg of water by 1C in 1 second. More practically a 3kW element will heat a 150l geyser by 1 degree in 210 seconds, or about 17C in an hour. These numbers do of course exclude heat required to warm up the geyser itself, as well as heat losses occurring during the heating. but they are relatively small.
  4. Don't forget about cooling the Pylontechs - they really want to stay at 20-30C for optimal lifetime. Remember that they generate heat due to their internal resistance, so unless cooling is provided they can get quite warm. The quoted 6000 cycle life is at 25C - it drops to 4300 at 40C and 2400 at 50C. I have my inverter/battery room on an outside wall. Whenever the outside air is cooler than the batteries air from outside is circulated through the battery enclosure to cool them (to minimum 20C). In the day they heat up due to charging - the heat generated goes up with the square of t
  5. It is a bit confusing - the class of inverter called "grid-tied" could have been called "grid-export" and it would have been clearer. Essentially these are inverters that are designed to export excess energy to the grid, and are hence subject to strict regulations as they could make live an utility line on which somebody is working. They generally use the grid as their "heartbeat" - if the grid goes down, so do they. All other inverters have provision for connection to the grid (or a generator) to supplement power when PV is insufficient. These are "off-grid" inverters and they cannot
  6. Two comments: 1. These solid state relays need huge heat sinks when running high current. 2. The losses from combining different orientation panels on a single MPPT are surprisingly small - 0 to 2% according to this https://portal.segensolar.co.za/reseller/images/Presentations/2018/Huawei Brochure/V8_23-10-2018.pdf, about 1% according to some other research that I have seen linked on this site.
  7. The curve shows that you lost about 10% charge in 6 hours. That equates to about 66W draw - not too far out of line with what one might expect (My Kings use 42W from the battery when in bypass mode) One further observation: certainly on the King the battery usage when in line or in bypass mode has changed significantly with different versions of the firmware. That makes comparisons difficult unless you also know the firmware versions.
  8. I have 3 in parallel same as yours, but I do not use ICC - I have developed my own solution on a microcontroller. One way that you can easily test: use WatchPower, connect to one inverter only. If you see all 3 inverters in Watchpower the problem is with ICC, otherwise the problem is with one of your inverters. By the way, the connection can be to any inverter - it does not have to be to the master.
  9. Remote Panel 02.60 : https://www.ostrovni-elektrarny.cz/support/Axpert/FW/RemotePanel_Reflash_MCU(02.60).rar For firmware 71.94 see downloads section on this site.
  10. The remote display handles all the parallel communications - could be important. When facing strange behaviour it is generally good practice to be on latest...
  11. This all sounds weird, but then Axpert firmware is not exactly written by geniuses... One thing that I would suggest - if you are not already there, make sure that you are on the latest firmware - 71.94 for the DSP (main unit) and 2.60 for the remote display. One other thing: is the "not logging inverter" always the same one? What happens if you connect to only that one (make it master by switching it on first) - can it see the others?
  12. What happens when you connect to only one inverter? ICC is designed to communicate to only one inverter - it gets the information for the others through the inverter parallel connections. I suspect that your multiple connections are the cause of the inverter appearing multiple times.
  13. This is surprising. I would expect them all to be the same. Most of the rest of what you write is unsurprising - the King's LiFePo4 integration is primitive and poor. The good bit is that the King gets the target charge and (I assume) discharge voltages from the BMS. If you have the ability to sets these in your BMS then you can solve at least some of your problems. The bad news is that the King is fundamentally designed around lead-acid technology. That means that it really does everything using voltages rather than BMS reported SOC. Examples are back-to-grid and back-to
  14. See the thread below - it was the same issue - a Remote Display that "died" during an upgrade. https://powerforum.co.za/topic/3759-axpert-king-inverter-firmware/page/8/
  15. Minor correction (certainly applicable to King): QPGS0 returns Master QPGS1 returns first inverter QPGS2 returns second inverter etc.
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