July 3, 20196 yr Battery Specification: Charge parameter: Charge Voltage Minimum 53.2V; Typical 55.0V; Maximum 56.4V Charge current: 0.1C to 0.2C Battery discharge parameter: Discharge voltage: Minimum 40.0V; Typical 48.0V; Maximum 53.0V I current have the following inverter settings: 02: 10A 05: USE 12: 44V 13: 52V 26: 56V 27: 55V 29: 42V I have noticed that the batterye voltage will drop with 40minutes from 46V to 44V. I have also noticed that the charge will slow down from 52V to 55V and will take almost 3 hours to reach 55V. Charge from 46V to 52V will be reached within less than 2 hours. Edited July 3, 20196 yr by Johanf
July 3, 20196 yr 2 hours ago, Johanf said: the batterye voltage will drop with 40minutes from 46V to 44V. Does this happen under load, or under idle? Your battery is only 50AH by the looks of things, so under a heavy load it will not last long. 2 hours ago, Johanf said: the charge will slow down from 52V to 55V and will take almost 3 hours to reach 55V. Likely due to the preset Lead acid battery charging algorithm. You will have to program custom settings. Coulomb is usually best with those settings.
July 4, 20196 yr Your voltages make more sense to me if it's a 16S battery. [ Edit: but it seems more likely to be 15S after all. If so, multiply my 16S values by 15/16. ] On 2019/07/03 at 11:46 PM, Johanf said: I current have the following inverter settings: 02: 10A 10 A is such a weak charge current. You'll likely need more of these in parallel. Quote 12: 44V 13: 52V I would increase those a lot. I'd start with 51 and 53; those are the figures I use for my own 16S LFP battery (prismatic cells). Quote 26: 56V 27: 55V Those are a bit high. I use 55.2 and 53.7. Quote I have noticed that the batterye voltage will drop with 40minutes from 46V to 44V. That's because it's nearly empty, and is in one of the steep parts of the voltage versus SOC curve. I would not let the battery go below 51 V no-load and rested (hence setting 12 at 51 V). Quote I have also noticed that the charge will slow down from 52V to 55V and will take almost 3 hours to reach 55V. That's because the voltage versus SOC curve for LFP is very flat, with a plateau at around 3.33 VPC. For 16S, that's about 3.33 x 16 = 53.3 V. So for a long time, while the SOC is steadily increasing, the voltage will stay close to 53.3 V. Quote Charge from 46V to 52V will be reached within less than 2 hours. Again, that's because you're at the low end of the voltage versus SOC curve. There is another flat area on the curve, at 3.29 VPC (52.6 V). So you're just getting to the first flat part. Edited June 6, 20206 yr by Coulomb
June 5, 20206 yr HI Does anyone have the full list for the King 5kva inverter battery settings. I just installed mine and only use for backup. I just charged it up for the fist time, then turned council off and within a minute the voltage dropped from 53.7V floating to around 49.5V. On the inverter display it showed the battery was already on half, but on the cell itself it showed all 4 lights so full. If anyone can please assist. I also do not want to exceed the 80% discharge dod.
June 6, 20206 yr 7 hours ago, RudolphC said: I charged it up for the fist time, then turned council off and within a minute the voltage dropped from 53.7V floating to around 49.5V. On the inverter display it showed the battery was already on half, but on the cell itself it showed all 4 lights so full. It seems that these must be 15S after all. In that case, 53.7 V is very high. You should use the voltages for Pylontechs; see a recent post of mine today (sorry for the lack of link, AFK).
June 6, 20206 yr On 2020/06/06 at 6:12 AM, RudolphC said: I also do not want to exceed the 80% discharge dod. Usually a BMS or monitoring program such as ICC would do this best; relying on the King to stop discharging the battery is crude. But if you insist, you could try something like 47.8 V in setting 29 (low DC cutoff voltage). This will mess with the back to utility voltage setting. If your grid is reliable (cough), then you can rely on setting 12 to send you to utility mode first, and keep setting 29 at about 46.5 V (will switch to bypass mode at a battery voltage of 48.5 V). More in FAQ question 2 (see also question 1). Edited July 9, 20205 yr by Coulomb
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May 15, 20233 yr Hi, just came across this after a customer asked me to check his Axpert / Shoto settings. The manual / brochure and suggests 56.4V charge, see from manual and brochure. @Coulomb would you still suggest the Pylontech 5.2V? Edited May 15, 20233 yr by Colin
May 15, 20233 yr 4 hours ago, Colin said: The manual / brochure and suggests 56.4V charge, see from manual and brochure. @Coulomb would you still suggest the Pylontech 5.2V? The information in that datasheet is inconsistent. Note how the 16S typical value is 3.60 VPC, but the 15S value is 3.76VPC! The 15S values should all be at least 3V less than the 16S values. Yet the typical values differ by only 1.2V. That suggests at least a typographical error. The BMS will start disconnecting at 54.0V, which is 3.60 VPC. I still suggest a maximum of 52.5 V. Edited May 15, 20233 yr by Coulomb
May 15, 20233 yr 1 hour ago, Coulomb said: The information in that datasheet is inconsistent. Note how the 16S typical value is 3.60 VPC, but the 15S value is 3.76VPC! The 15S values should all be at least 3V less than the 16S values. Yet the typical values differ by only 1.2V. That suggests at least a typographical error. The BMS will start disconnecting at 54.0V, which is 3.60 VPC. I still suggest a maximum of 52.5 V. Thank you, appreciate the input
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