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Kilowatt Power

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Everything posted by Kilowatt Power

  1. Yes. 3 CT coils are installed with the same polarity on each phase. Had to change the direction of all 3 CT coils when I realised energy was being exported to the grid. Shall get pictures when I next visit the site.
  2. The 3-phase string inverter doesn't have the exact menu options as the hybrid but enabling unlimited export is still worth a try. I doubt if the utility meter will enter into tamper mode as a result. The worst that can happen is for the meter to count exported energy forward. The string inverter has options for a limiter or smart meter. Opted for the Eastron CT smart meter. Thanks. SUN-25K-G03 is a grid-tied inverter. Everything is on the grid side, after the main incomer MCCB.
  3. Shall be able to share tomorrow's graphs now that WiFi is available in the basement.
  4. The mounting structure is fixed. The 5° tilt angle was to allow for rain to naturally clean the panels. Having said that, I'll get the panels hosed down once again to completely eliminate the possibility of dust curtailing production. Wasn't measured. Shall try getting readings with the clamp meter thermocouple probe at high noon.
  5. I stumbled upon an old Deye Inverter Catalogue with the below block diagram and efficiency curve for SUN-20/25K-G02 EDIT: Looks like 660Vdc is the sweet spot even though the MPPT operating range is specified as 200~850Vdc. I don't know if the formula Vdc = sqrt(2) x Vrms applies to the DC bus as is the case with rectifiers.
  6. The 15kW load runs from 8am to 4pm. Maximum solar production is at 12 noon when the sun is directly overhead. North East happens to be the building azimuth angle. I would however want to believe that direction becomes less significant as the tilt angle approaches 0°. I read somewhere that a horizontal roof has a tilt angle of 0° and an azimuth angle of 0° I want to believe so. It's correctly displaying V, A, %THD, Hz, PF, kW, kVAr, kVA, kW and import/export kWh and kVArh. Most importantly it's communicating with the inverter and preventing grid feed-in. Shall peruse the manual once more and go through all settings just to be sure.
  7. Or could the Grid Standard be throttling production? Which Grid Standard allows unlimited inverter power output for 240/415Vac distribution systems? The Grid Standard is currently set to IEC61727. Other available options are: INMETRO EN50549 EN50438 IEC61727 CUSTOM VDE_AR_N_4105 UTE_C15_712_1 RD_1699 CEI_0_21 G98_G99 AS4777 NBT-32004 AS4777.2 Australia A AS4777.2 Australia B AS4777.2 Australia C AS4777.2 New Zealand MEA PEA Norway Switzerland R25
  8. Greetings, I'm trying to figure out what could be encumbering production of a grid-tied installation very near the equator. The maximum power generated under a clear blue sky is 8.5kW (55% of capacity) against a variable torque motor load of 15kW driven by a 18.5kW VFD at 50Hz. The balance 5.5-6.5kW required is purchased from the grid. Particulars of the Installation Inverter - Deye SUN-25K-G03 three-phase string inverter with 2 MPPT trackers running the latest firmware Panels - 14s1p Jinko JKM555M-72HL4 modules (7.77kWp, 696Voc, 574Vmp) on each MPPT, totaling 15.54kWp Orientation - 5 degrees tilt angle from the horizontal, 45 degrees East clockwise from magnetic north Cable run - 60m 4sq.mm PV1-F cable from the furthest panel on the rooftop to the inverter in the basement There's an Eastron SDM630MCT 3-phase RS485 Modbus RTU smart meter installed for zero export management The DC voltage displayed on the inverter when the motor is off is roughly 675Vdc which then drops to around 600Vdc when the motor is running. Would increasing the string voltage to 745.8Voc and 614.85Vmp by adding a panel to each string (15s1p) improve the overall efficiency? The maximum DC input voltage of the inverter is 1000Vdc.
  9. I've had great success at a student hostel with the 4A version of these current limiting protective devices. Culprits get disconnected for 60s whenever the load exceeds 920W.
  10. Below is the front panel of the battery in question. Close but not exactly the same as the link you've posted.
  11. Upon further scrutiny of the manual, it's become clear that the 3rd or rightmost port is a combined RS485/CAN port for inverter comms. That leaves the 2nd or middle RS485 port free for battery-to-battery comms.
  12. It sure does look like a Seplos BMS with the exception of a left most RS232 comm port.
  13. The second dilemma is the battery has only 3 comm ports; RS232, CAN and RS485. How then does one connect additional batteries in parallel if the only RS485 port has been used for comms with the inverter?
  14. Greetings, According to the manufacturer of SEG-48100H 15s 48Vdc 4.8kWh battery modules, communication with Deye hybrid inverters is possible using RS485 Pylon low voltage new protocol design 9600. Am I right to assume that the battery can also talk to Voltronic Power Axpert inverters with "detachable" displays eg. Axpert VM III and King using the same protocol?
  15. I wouldn't really refer to setting 13 as a transfer time setting. It's the AC voltage range setting. For Axpert inverters, changing the AC input voltage range from APL to UPS has the effect of shortening the transfer time from 20ms to 10ms. What type of power supply does your radio use? Linear (transformer based) or switched (SMPS)?
  16. Do you have specs for your panels i.e. Pmax, Vmp, Imp, Voc & Isc? MPPT, short for maximum power point tracker, is electronic circuitry (DC to DC converter) that optimises power extraction from solar panels (or wind turbines) to the inverter or battery system, as weather conditions vary. A good analogy of an MPPT as a vehicle's transmission system, offering power from the engine to the wheels is explained here.
  17. Off the top of my head, your PS4 power supply cannot "ride through" the 20ms transfer time of your SNA 5K inverter. Not sure but try changing the AC input voltage range setting from APL to UPS to reduce the transfer time from 20ms to <15ms.
  18. What's the exact make & model of your inverter? Does it have any communication interfaces at the bottom or sides labeled "RS485" or "CAN"? Did you purchase and install the system yourself or did you engage an installer?
  19. Finally found it. The factory model is SEG-48100H manufactured by Shanghai Electric Gotion and sold in SA by Power and Sun Solar Solutions, Johannesburg.
  20. What could be the factory model of JKS-B48100-HI (100Ah, 15s, 48Vdc 4800Wh) LFP battery pack with Gotion IFP27175200A-100Ah cells? Specifications attached.
  21. 35 sq.mm battery cable and 160A fuse would have been more ideal from the onset. What's the cross sectional area of your battery cable?
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