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

Kilowatt Power

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    Nairobi, Kenya
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    Renewables, Power Electronics, Linux, Javascript,

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  1. Sometime back I contrived a power failure alarm using a 2P 1NO+1NC contactor with a manual control switch, a 22mm panel mount red flashing buzzer and 22mm panel mount green pilot lamp. The wiring diagram is shown below. Working: Position auto: mains available -> red OFF, green ON Position auto: mains failure -> red ON, green OFF Position 1: mains failure -> red OFF, green OFF (used to silence the alarm) Position 1: mains available -> switch automatically returns to auto position Position 0: red ON, green OFF (used as test) The contactor and LED indicator lamps have been working well the last 3 years or so without getting hot to the touch. I hope this helps.
  2. One objective is to save on electricity bills by supplementing grid intake with solar especially for the central air conditioner. I'm pretty sure you don't mean that I simply bolt the 3 incoming phases together at the DB.
  3. No. The proposed design has solar panels connected to the 3-phase Ginlong Solis grid-tie inverter and batteries on the single phase Axpert 5K inverter.
  4. Hi All, I trust we are all well. I just wanted to pick your collective brain on a residential self-consumption 3-phase grid-tied solar system with battery backup design. Essential loads night time energy demand: 2600W, 9.70kWh (during grid-loss events) Non-essential loads day time energy demand: 45kWh Solar panels: 16S1P Jinko 390Wp (49.3Voc, 41.1Vmp) Battery Bank: 4S2P 12V 200Ah VRLA AGM Off-grid single phase inverter: Axpert MKS 5K 3-Phase Grid-tie inverter: Ginlong Solis 3P6K-4G Electrical installation works are yet to commence and I've proposed putting all essential loads on one phase. The only 3-phase equipment include a 28kW central air conditioner and a pool pump. In your opinion, is there a better and more affordable way of maximising the solar investment other than using an expensive 3-phase true hybrid inverter?
  5. Are CEIL Solatron batteries still widely used in South Africa?
  6. Victron Quattro with two AC inputs and PowerAssist feature comes to mind.
  7. I guess they meant with sufficient solar power. The footnote is even more confusing.
  8. I'm planning on test driving the UrVolt PH-5000E-D Hybrid ECO from Taiwan after it was recommended by an installer in India. The CT clamp export limiter is a plus for me. Price is US$ 750 FOB Taiwan.
  9. Why aren't InfiniSolar VII hybrids popular when Axperts rule the roost in the off-grid world? Is it an issue of NRS approval, reliability or cost?
  10. @timematcher Just keen to know how you found out one cell was shorted when series voltage for two batteries was above 24.2 VDC. Sorry to take you back to 2016.
  11. Thanks Coulomb. The batteries are VRLA Polygel (a mix of AGM+GEL chemistry) with the following characteristics: Standby use - 13.5V - 13.8V, initial current - no limit Cyclic use - 14.4V - 15.0V, initial current - 50A max. I couldn't possibly sit and wait 10 hours (600 mins) watching them charge so I'll try 4 hours bulk charging time at 50A, 13.8V per block as per the attached charge characteristic graph. I'll therefore change settings 02 -> 50A, 11 -> 50A, 26 -> 55.2V (i.e. 4*13.8V - below gassing voltage ), 27 -> 54.0V (i.e. 4*13.5V) and 32 -> 240 minutes then see if performance improves. P.S: I tested individual batteries using a 100A load tester and voltage dropped from an average 13.6 to 11.9V within 5 seconds. A second test using a conductance battery analyser did not reveal any internal resistance > 3 milliohms.
  12. What are the implications of changing setting 32 - Bulk charging time from AUt to say 600 minutes with a maximum utility charging current of 20A? I'm asking because I have a set of 1 year old 4 x 200Ah Gaston GT12-200AG polygel (AGM+GEL) batteries that discharge pretty fast (< 3 hours) from >48V to 42V low DC cut-off voltage at an average load of 600W and suspect they are not getting sufficient absorb time.
  13. As basic as this may sound, are "cyclic use" and "standby use" markings on batteries synonymous with absorb (bulk?) and float voltages?
  14. Going by the image you posted, your Synapse 3.0+ 24V inverter is a genuine Voltronic Axpert VM 3000-24 Plus.
  15. Hi, I predominantly use two types of VRLA AGM batteries with the following characteristics @ 25°C a) Ritar DC12-200 (AGM 12V [email protected]) Cycle Use Voltage: 14.6V ~ 14.8V (-3mV/°C/Cell), max current: 60A Float Charging Voltage: 13.6V ~ 13.8V (-4mV/°C/Cell) b) Gaston GT12-200AG (AGM+GEL 12V 200Ah/C20) Cycle Use Voltage: 14.4V ~ 15.0V (-30mV/°C), max current: 50A Float Charging Voltage: 13.6V ~ 13.8V (-20mV/°C) I have the following settings on 24VDC and 48VDC Axpert MKS inverters with 2*200Ah and 4*200Ah batteries in series: 02 - Maximum charging current: 20 05 - Battery type: USE 11 - Maximum utility charging current: 20 26 - Bulk charging voltage (C.V voltage): 29.2 & 58.4 on 24VDC and 48VDC models respectively. NB: Maximum on MKS inverters 27 - Floating charging voltage: 27.4 & 54.8 on 24VDC and 48 VDC models respectively 29 - Low DC cut-off voltage: 21 & 42 on 24VDC and 48 VDC models respectively 32 - Bulk charging time: AUt (5K model only) 33 - Battery equalization: Ed5 (disabled) In my part of the world, the high/low temperature typically varies from 22/13°C to 27/16°C and is rarely below 10°C or above 30°C over the course of the year. In your opinion, are these battery settings optimal for power backup applications?
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