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Calvin

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Everything posted by Calvin

  1. I have 3 Kings in parallel and have similar issues in the past. In my case it was related to heat. The SCC has a control loop that derates its output when the SCC temperature gets to 87C. Now that sounds a lot, but when you have high inverter output AND high PV that is quite easily reached. You can read the relevant SCC temperature by using the Q1 command. The SCC temperature is in ASCII in bytes 22-24 of the reply. I resolved the problem by: a. reversing the fans in the inverter. The default setup blows the hot air out the bottom, from where it rises and gets sucked in at the inlets again. Not Voltronics's finest engineering.... b. improving ventilation in my inverter room to reduce ambient temperature. One disclaimer: this was all on earlier versions (71.8x) of main firmware. Things may have changed with later firmware, although this code may live in the SCC which has not been updated.
  2. I don't know if this applies to all manufacturers, but my Pylons (US3000B batteries on firmware 2.8) use Equivalent Full Cycle as a cycle. That mean that for a 74Ah battery like the US3000 the cycle count is incremented by one for every 74Ah of discharge. Even when the battery capacity (SOH) decreases with age they still use the full original capacity as a cycle.
  3. I don't know about the Hubble, but the Pylons use Equivalent Full Cycle as a cycle. That mean that for a 74Ah battery like the US3000 the cycle count is incremented by one for every 74Ah of discharge. This is clearly the most conservative and most consumer friendly way of calculating it. Whether Hubble uses this I do not know. I suspect that they do - anything else would be arbitrary.
  4. From the web site: "Q: What are we selling? A : Sun Wind Hydro Charged Portable Tripler Power Generator "The GGII green portable backup genset is a combination of mechanical-electrical motor-alternator dynamos-solar-wind-battery storage unit which can produce safe, clean, reliable, free off grid electricity 12 or 24 hours as needed." All lubricated with a generous dose of snake oil....
  5. Well, it certainly suggests that the picture may not be quite as dire as @Gnome suggests. Given the early-life abuse that your cells appear to have experienced, 12.5 years and counting is very reassuring.
  6. Battery Brand/Model: Pylon US3000B (x8) Installation Date: Jan 2020 Cycles: 270 Performance: Very good. Remaining capacity (SOH) is reported as 97.3% by BMS. This is a calculated value - the Pylon BMS (firmware 2.8) reduces remaining capacity by 0.1% for every 740Ah (equivalent to 10 complete discharges). This will probably flatten out later.
  7. @Gnome I am very interested in this research you found - do you have any links? I have spent many hours looking for data on calendar based aging for LiFePO₄ batteries but have not found much of use to me. The biggest issue is that they generally perform the tests at far higher temperatures than the 20-30ºC that my batteries experience. Another question: I am curious how some vendors can sell "2nd life" cells of unknown (to the customer anyway) calendar age if they indeed may last only 6 years from new. Do you have any thoughts on this? It is my understanding that those cells would already be 5+ years old when sold.... @Coulomb, from your signature you are running "ex-EV" LFP cells. Any comments on age / performance / capacity decrease?
  8. I think that it is a national requirement that you must be a net consumer (in kWh, not in Rands) - it certainly is in Cape Town. That means that you can at best get about a one third reduction in the energy cost by exporting to your limit. There was a user on this forum who claimed to get back thousands of Rands every month from COCT, but he never provided proof and seems to have gone off air. Not sure what that was all about....
  9. Using todays prices: You purchase: USD1968 / 3 * 15.74 (R/USD) = R10 324. Local Pylontech 2000B (Powerforum Store): R12 822 Not exactly half. 80% in fact.
  10. Try https://www.yr.no/en or the YR app. Works very well for me (Stellenbosch). Having said that, current weather patterns are very disrupted and I think all the forecasters are struggling a bit.
  11. I finally on Monday received a Hubble AM2 that I ordered in November, and which had been promised for "first week of December" I understand that the November load shedding caused a huge spike in orders and that had inevitable consequences on deliveries. The part that I found very disappointing and frustrating is the lack of feedback and honesty - lots of promises made and not kept. I made many calls and I suspect that the only reason I got the battery is that I made a complete nuisance of myself. If I had patiently waited I would still be waiting...
  12. Yes. You can have a changeover switch to bypass the system, or use the bypass feature of the inverter. Yes. It is not available on paralleled Kings but that should not be an issue for you.
  13. I don't know about other manufacturers, but the cycle counter in my Pylons (US3000B on firmware 2.8) is based on full original capacity cycles. They see a cycle as 266400 Coulomb (74Ah) irrespective of the battery's SOH. So for a Pylon the internal cycle counter will reach 6000 after 6667 cycles at 90%DOD, or 7500 cycles at 80%DOD.
  14. Everything on their web site looks suspicious - be VERY careful. Almost certainly a scam...
  15. Just to confirm - 3 micro Volt, or a typo? Either way - thanks. Happy with my Pylons but your DIY journey has given me itchy feet...
  16. I have Kings in parallel and Pylontechs so I might be able to help, but you really need to post more information on your setup. Are you using the Kings in USE or PYL mode, or ICC or some other management software? The firmware version and all the settings on the Kings. Ideally also some photos of the inverter screens.
  17. We differ on many things, but not on this. I used the word entity deliberately - it can be anything from a person to a large corporation. Google it.
  18. Welcome to the world of "alternative facts"... Apparently the city even gives him back his property taxes and "Surage" (which I assume means sewerage) If only...
  19. The announcement by Mr Ramaphosa lifted the limit for entities producing their own electricity without a license from 1MW to 100MW. Unless you have a REALLY big installation it makes no difference to you. I have never suggested that local government can override national laws - of course they cannot. The rules of the COCT (no net exporting and feed-in compensation of a maximum of one third of consumption) are not unique to Cape Town - this is the national policy. (see Outdated thinking and reactionary rules hold back elect... (dailymaverick.co.za) You have still provided no evidence that one can "get money from the council". I wish you could and would - it would be great news. Sadly, despite your claims to the contrary, it seems to be impossible at this time.
  20. If I understand you correctly you are saying that there are laws or regulations that compel municipalities to allow you to be a net exporter of energy and to pay you at such a rate for the exports that they will actually owe you money. Furthermore I understand that the COCT is actually doing this with you (giving you money back), despite publicly saying that they will not do it. These laws / regulations appear to be a very well kept secret - I can find no reference to them. Perhaps you would be so kind as to provide a reference to this information? I am sure that many members here will find it very useful.
  21. From a press release on COCT web site (February 2021): (CoCT and Feed-in Tariff - NRS/SSEG Regulations - Energy Talk) "‘The feed-in tariff works when customers are net consumers of electricity over a rolling 12-month period. They must therefore consume more electricity from the network than what they put back in over the course of a year. The feed-in tariff offsets their electricity bill and, while they will never receive money from the City, the excess power that is generated back into the City’s grid, will be used to balance out their month’s bill." The feed in tariff is about one third of the usage tariff, so even if you export as much energy as you use you will still pay two thirds of normal price. Last time I looked Melkbos was part of City of Cape Town. Something does not add up...
  22. If the battery is rated 5.5kWh that means you can take out 5.5kWh if you discharge it from 100% to 0% SOC and will "use" 1 cycle. If you do that 3000 times you will have taken out 16500kWh. If you discharge it from 100% to 50% SOC you will take out 2.75kWh and use half a cycle. If you do that 6000 times you will also have taken out 16500kWh. Correct. But you cannot use them alone - they need to be charged, and inverters are required to generate the AC. In practice PV panels and inverters have finite lifespans, so the effective cost of using them is not zero.
  23. A few corrections. Not to nitpick but some of your terminology and calculations will confuse some. Remember that kWh is a measure of energy, whilst kW is a measure of power. If you have a geyser that has a power rating of 2kW that you run for 3 hours, you will have consumed 6kWh of energy. Clearly you mean kWh, not kW. But, it would be 0.2c per Wh, not 2. Actually, 6000 cycles at 50% DOD will yield exactly the same energy as 3000 at 100% DOD. There is normally no good reason to cycle your battery several times in one day - once it is full you will simply use your input power (grid or PV) to power your loads, keeping the battery full. Discharging the batteries whilst you PV exceeds your loads makes no sense at all.
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