Tsa Posted February 21, 2020 Share Posted February 21, 2020 Anyone know the correct\best settings for the Dyness B4850 2.4kwh batteries for Bulk and Float voltages? I see a lot of data on the Pylons, but havent seen a spec sheet detailing these 2 settings yet. OR just not looking where I should. TIA Quote Link to comment Share on other sites More sharing options...
charl Posted February 24, 2020 Share Posted February 24, 2020 Dyness 3.6kwh.pdfDyness 2.4kwh.pdf Im not sure if these help. Im also looking to buy 2 3.6kwh I have not been able to find much info or reviews on these batteries Tsa 1 Quote Link to comment Share on other sites More sharing options...
Fazil Posted February 24, 2020 Share Posted February 24, 2020 we use Float = 51V Bulk = 52V cut off = 47V Quote Link to comment Share on other sites More sharing options...
Tsa Posted February 24, 2020 Author Share Posted February 24, 2020 Thanks, actually saw in the manual it indicates Charge Voltage as 52.5 - 54 V ___ 1 Quote Link to comment Share on other sites More sharing options...
Fazil Posted February 24, 2020 Share Posted February 24, 2020 my supplier recommends not exceeding 52V so we keep it at 52V. I know manual states 54V but try it and find what works. Same logic that applied to Pylon until the magic 53.2V was decided upon. Quote Link to comment Share on other sites More sharing options...
Tsa Posted February 25, 2020 Author Share Posted February 25, 2020 Agreed, interesting though is that when you set the Batt Type to Lithium on Growatt inverter and select L01 profile it then sets Bulk & Float to 54V. I was informed by Growatt that L01 is the profile for Dyness and L02 we know is for Pylontech from what others have posted on the forum. However when you do this method you are actually making use of that expensive BMS one paid for with the battery and would hope that it is the better option. Quote Link to comment Share on other sites More sharing options...
Fazil Posted February 25, 2020 Share Posted February 25, 2020 6 hours ago, Tsa said: Agreed, interesting though is that when you set the Batt Type to Lithium on Growatt inverter and select L01 profile it then sets Bulk & Float to 54V. I was informed by Growatt that L01 is the profile for Dyness and L02 we know is for Pylontech from what others have posted on the forum. However when you do this method you are actually making use of that expensive BMS one paid for with the battery and would hope that it is the better option. Never tried it. We just set it as USE = 52V Perhaps I must run it with L01 for a bit and see the effect. Make sure the BMS is actually working. Tsa 1 Quote Link to comment Share on other sites More sharing options...
Tsa Posted March 23, 2020 Author Share Posted March 23, 2020 Quick one for the technical guys. Based on the below specs... Ignoring losses and other technicalities for this example. One would be able to discharge this battery at 2,4kw for one hour. 1,2kw for 2 hours, etc etc. 1) Is it more damaging to the battery to discharge at 2.4kw vs 1.2kw vs 0.6kw? Sure BMS will have some sort of protection in place if discharge current is too much, but thinking more in terms of prolonging battery life\health. 2) Is there any benefit in only discharging Lithiums to 20% vs discharging to 10% (what about 5%?) ? How does the above change when you have say 3 of these in parallel? Quote Link to comment Share on other sites More sharing options...
Tsa Posted March 30, 2020 Author Share Posted March 30, 2020 Just bumping this one in case it got missed. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 30, 2020 Share Posted March 30, 2020 (edited) On 2020/03/23 at 5:16 PM, Tsa said: 1) Is it more damaging to the battery to discharge at 2.4kw vs 1.2kw vs 0.6kw? Sure BMS will have some sort of protection in place if discharge current is too much, but thinking more in terms of prolonging battery life\health. It's hard to say. It says you can discharge at 2.4 kW, but what factor of safety have they included in this figure? It's always better for battery life to discharge a battery more slowly (lower power). The practical question is, at what point does the battery life benefit outweigh the hassle of lower discharge power? These cells are presumably designed for energy, not power. Generally, these seem to get around the 1C rating, as these do. So I'd say 2.4 kW is a practical figure. Quote 2) Is there any benefit in only discharging Lithiums to 20% vs discharging to 10% (what about 5%?) ? I believe so. 80% DOD seems to be the accepted figure. Occasional excursions to 10% SOC or even more rarely to 5% SOC should be relatively safe. Quote How does the above change when you have say 3 of these in parallel? All the power figures treble, i.e. 7.2 kW should be safe. The SOC figures stay the same: stick to 80% DOD or less most of the time. Edited March 30, 2020 by Coulomb Added "SOC" twice to clarify Quote Link to comment Share on other sites More sharing options...
Tsa Posted March 30, 2020 Author Share Posted March 30, 2020 (edited) Thanks @Coulomb, appreciate the replies. 3 hours ago, Coulomb said: I believe so. 80% DOD seems to be the accepted figure. Occasional excursions to 10% or even more rarely to 5% should be relatively safe. I have set my back to grid at 15% and low power cut off @ 10%. I have not seen the 15% yet, so far worst has been 19%. 3 hours ago, Coulomb said: All the power figures treble, i.e. 7.2 kW should be safe. The SOC figures stay the same: stick to 80% DOD or less most of the time. Understood, was more referring to it now being able to technically handle 7.2kw for 1 hour, but now the 2.4kw doesn't draw doesn't sound that bad vs just having 1 battery at 2.4kwh. I also found the following data regarding these batteries which gives some more detailed info and basically confirms what you have also said. My only reason for asking all of these questions was to be able to answer the question you also asked, getting the balance between battery life and discharge power. If it will extend my battery life considerably I would rather set my back to grid @ 20% instead of 15% for instance. Also to try and make a plan to be sure the load isn't more than 2.4kw at any point when on batteries. This is a bit difficult as I have seen that the batteries get charged to 99/100% and then PV is disconnected automatically and load is covered by the batteries only, until it gets to 95% again where PV kicks in again and starts the charging up to 99/100%. Edited March 30, 2020 by Tsa Quote Link to comment Share on other sites More sharing options...
Tsa Posted April 26, 2020 Author Share Posted April 26, 2020 Further to the above. Some clarity please. If nominal discharge is 25A (0.5C), and you have 3 batteries in parallel, is nominal discharge then 75A total? 50A if it was 2 batteries in parallel? OR will nominal remain 25A no matter how many batteries you have in the pack as that is the characteristics of the cells? Basically I'm just worried about driving my battery bank too hard. 3x of the above batteries in parallel but sometimes do see a load on batteries of around 2kw which is above 25A (nominal discharge) for 1 battery. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted April 26, 2020 Share Posted April 26, 2020 3 hours ago, Tsa said: If nominal discharge is 25A (0.5C), and you have 3 batteries in parallel, is nominal discharge then 75A total? Yes. Battery modules in parallel means the current limits add. Quote Link to comment Share on other sites More sharing options...
Tsa Posted April 27, 2020 Author Share Posted April 27, 2020 19 hours ago, Coulomb said: Yes. Battery modules in parallel means the current limits add. Thanks for the confirmation. So then even 2.4kw draw (max power for 1 battery as per spec) would not be an issue on a 3 battery stack. Quote Link to comment Share on other sites More sharing options...
Tsa Posted May 11, 2020 Author Share Posted May 11, 2020 When running from batteries, would it be normal for the lights to flick for a millisecond when a microwave starts(1kw) or the fridge motor kicks in(1A)? Don't see it happening when on grid power, only on batteries. Overall load at that stage is 200W - 400W max prior to appliance coming on. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted May 11, 2020 Share Posted May 11, 2020 4 hours ago, Tsa said: When running from batteries, would it be normal for the lights to flick for a millisecond when a microwave starts(1kw) or the fridge motor kicks in(1A)? Don't see it happening when on grid power, only on batteries. Yes, it's normal. Some lights are more susceptible to flicker than others, and some humans are more annoyed about it than others. A bigger, newer battery will probably cause less flicker. Tsa 1 Quote Link to comment Share on other sites More sharing options...
Eddiechizz Posted February 8, 2021 Share Posted February 8, 2021 My 5 months old battery is failing to power on? Its was drained and switched off, now its failing to power on and can not be recharged. What should i do? Has it packed? Quote Link to comment Share on other sites More sharing options...
master chan Posted October 26, 2021 Share Posted October 26, 2021 i have 5kw rct solar inverter and 2 * 3.5 dyness lithium battery and what it doing when i set it at pylon , give me 61 flashing i have this problem, now change setting to use Master Quote Link to comment Share on other sites More sharing options...
Coulomb Posted October 27, 2021 Share Posted October 27, 2021 22 hours ago, master chan said: dyness lithium battery and what it doing when i set it at pylon , give me 61 flashing According to this post, Dyness use the same CAN bus protocol as the Pylontechs. But Pylontechs also have RS-485 protocol, and RCT/Mecer/Kodak/Axpert inverters use RS-485 protocol when talking to the Pylontech BMS. It's possible that Dyness didn't also copy the RS-485 protocol, or perhaps you are using a cable designed to talk to a BMS via CAN bus. Where did your cable come from? Do you know its pinout? Quote Link to comment Share on other sites More sharing options...
Charlie28 Posted December 6, 2021 Share Posted December 6, 2021 Good Day Everyone. Programmed may inverter yesterday according to what I have read off this thread. One more question? At what voltage should my battery begin working again. At the moment I have set it to 54V but should I rather say that the battery needs to be fully charged before working again? Quote Link to comment Share on other sites More sharing options...
Peter K. Posted June 24, 2022 Share Posted June 24, 2022 Hi guys, could anyone advise me,I have Solis RHI-6K-48ES-5G inverter and dyness batteries 2.4kw X2 and getting Can communication failure error messages every few hours, Google few suggestions but not sure if someone has the same set up and wouldn't mind to advise? much appreciated Quote Link to comment Share on other sites More sharing options...
Ismail786 Posted September 16, 2022 Share Posted September 16, 2022 On 2020/03/23 at 9:16 AM, Tsa said: Quick one for the technical guys. Based on the below specs... Ignoring losses and other technicalities for this example. One would be able to discharge this battery at 2,4kw for one hour. 1,2kw for 2 hours, etc etc. 1) Is it more damaging to the battery to discharge at 2.4kw vs 1.2kw vs 0.6kw? Sure BMS will have some sort of protection in place if discharge current is too much, but thinking more in terms of prolonging battery life\health. 2) Is there any benefit in only discharging Lithiums to 20% vs discharging to 10% (what about 5%?) ? How does the above change when you have say 3 of these in parallel? Hi is there any settings for the dyness A48100 battery Quote Link to comment Share on other sites More sharing options...
mzezman Posted September 17, 2022 Share Posted September 17, 2022 21 hours ago, Ismail786 said: Hi is there any settings for the dyness A48100 battery Hi ismail What inverter are you using with the 48100? Does the inverter communicate with the battery? Quote Link to comment Share on other sites More sharing options...
Namreh Posted November 17, 2022 Share Posted November 17, 2022 On 2020/02/24 at 8:13 PM, Fazil said: we use Float = 51V Bulk = 52V cut off = 47V Hi, is this in the custom settings as when you connect the BMS it seems to override all settings Quote Link to comment Share on other sites More sharing options...
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