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PowerUser

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  1. I need some help sizing a correct string for a SunSynk 5KW inverter. The inverter specs are as following: PV String Input Data Max. DC Input Power 6500W PV Input Voltage 370V (100V~500V) MPPT Range 125~425V Full Load DC Voltage Range 240~425V Start-up Voltage 150V PV Input Current 11A+11A No. of MPPT Trackers 2 No. of Strings Per MPPT Tracker 1+1 I would like to size a string for one MPPT Tracker and possibly half of the input power for now. Later I'll add more panels for another sting on the second MPPT. The panels I have in mind have the following specs: Electrical Characteristics STC Maximum Power (Pmax) 250 W Maximum Power Current (lmp) 8.31 A Maximum Power Voltage (Vmp) 30.1 V Short Circuit Current (lsc) 8.83 A Open Circuit Voltage (Voc) 37.4 V Electrical Characteristics NOCT Maximum Power (Pmax) 185 W Maximum Power Current (lmp) 6.57 A Maximum Power Voltage (Vmp) 28.2 V Short Circuit Current (lsc) 7.12 A Open Circuit Voltage (Voc) 35.0 V First question would be - Do I look at the specs at STC or NOCT? Another question - What does it mean when they say "Full Load DC Voltage Range 240~425V"? Is the MPPT going to stop working above 425V? And thirdly - What do they mean by "No. of Strings Per MPPT Tracker 1+1"? Can I put 2 strings per MPPT and use a combiner box or only 1 string per MPPT, as there is only 2 PV inputs on the inverter? If I want to be as close as possible to half the inverter DC power 6500W/2 = 3250W Let's say the panels are old already lost 10% of the max power, so they should be 225W now. 3250W/225W = 14.4 panels. Let's say 14 panels in one string per this calculation. Or, as per NOCT - 185W - 10% = 166.5W 3250W/166.5 = 19.5 panels. Let's say 19 panels in one string per this calculation. The inverter say - Full Load DC Voltage Range 240~425V 425V/37.4V = 11.4 panels. Let's say 11 panels in one string per this calculation. Or if I look at the NOCT Voc 35V: 425V/35V = 12.1 panels. Let's say 12 panels in one string per this calculation. Which of the above calculation and string size would be best given the above specification?
  2. @AlexTZA If you only need this systems to provide power during loadshedding, you might not need solar panels at all. Just an inverter and battery should be sufficient. What are trying to achieve by adding the solar panels? Rather use the budget for the panels, towards good inverter and battery. There is nothing wrong with 3Kw, 24V system for your requirements, as the power demand for the guard house should not raise.
  3. That happens when the small nuclear reactor kicks in, inside your SunSynk inverters
  4. That website is a very obvious SCAM!!!
  5. Very good idea @Sarel. Probably the best place is the "General" or "Solar Power" section. However, I don't see much point of "Solar Power" section, since 90% of the forum content is about solar power.
  6. There are many discussions about those elements in various treads on this forum. Use the search function
  7. Either one of the Voltronic 5kW inverters or Growatt SPF5000ES. I think both options are priced at the same range. You need to do some research into the settings and behaviours of both options when used off-grid and see which will suit you better. For batteries, lead acid will be the most budget option but do you really want to go that way. For lithium batteries - either PylonTech or Hubble.
  8. @87 Dream What is a “massive hole in the pocket”? Show us some examples and numbers of one system vs another?
  9. According to the above video, without battery, you shouldn't connect anything to the essential load.
  10. Most likely there is voltage drop outside the inverter tolerance values during lighting and the SunSynk sees it as no power from the grid and shuts off. Here is a video from Keith explaining "no battery" operation of the inverter:
  11. There is something else to consider as well, you might find a great BMS for your setup and order from China. Wait 3 or more months to arrive and get everything working. But if the BMS fails down the line after few months or a year - then what? Your whole system will be down for several months, while waiting for another shipment from China. Not having good options available locally is really a big issue.
  12. His problem with QUCC BMS was the balancing current was too low to be useful. Apparently, JK and Heltec BMS come with 2A active balancer build-in. Andy has another video lined up for the weekend to test the JK BMS.
  13. @Tariq Thank you! I'm even on a later version already - MCU:3363
  14. Is this V1? Brand new is R2960 - https://www.pace-energy.co.za/products/hubble-lithium-riot-cloudlink
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