July 29, 20232 yr 10 hours ago, cp69 said: Anyone pulling the trigger on some cells from apexium? Price seems brilliant? Which cells did you go for? I'm keen to get mine and do testing.
July 29, 20232 yr Author I'm going for the 230ah cells. First diy battery attempt. Just deciding what bms to use
July 29, 20232 yr 5 hours ago, Energy-Jason said: Just waiting for them to complete their commercial section on the forum. (ETA: Tuesday) Very excited to have the onboard for all of us. Sincerely Jay
July 29, 20232 yr 1 minute ago, Greglsh said: Do you have a link to these please. Sure we waiting on them to complete the info for the commercial section. We have been promised this info by Monday/Tuesday. Sincerely Jason
July 29, 20232 yr 16 minutes ago, cp69 said: I'm going for the 230ah cells. First diy battery attempt. Just deciding what bms to use There are a number of bms options. Just make sure you use a bms that has CAN communication with your inverter if possible. Also with those size cells get a 200A bms. @Energy-Jason hope you don't mind us talking about DIY batteries for now. We won't advertise until Apexium are setup here. Edited July 29, 20232 yr by Chris_S
July 29, 20232 yr 16 minutes ago, Chris_S said: There are a number of bms options. Just make sure you use a bms that has CAN communication with your inverter if possible. Also with those size cells get a 200A bms. @Energy-Jason hope you don't mind us talking about DIY batteries for now. We won't advertise until Apexium are setup here. I don't mind at all. Go for it. It's your forum. Best. Jay
August 11, 20232 yr On 2023/07/29 at 9:45 AM, Chris_S said: There are a number of bms options. Just make sure you use a bms that has CAN communication with your inverter if possible. Also with those size cells get a 200A bms. @Energy-Jason hope you don't mind us talking about DIY batteries for now. We won't advertise until Apexium are setup here. Do you really think its critical for comms between the battery and inverter? With my DIY batteries I am going with a JK BMS although, so there won't be comms between the 2 batteries or to the inverter. I know one of the issues which can happen in such a situation is the one battery reaches full charge before the other and stop accepting charge which can then cause too much charge on the other battery and can cause that to shut down / go into protection mode due to overcharge current.
August 11, 20232 yr Author I'm about to order a seplos v3 bms. It's going to be around 3k landed in SA for the 150A. I can add one for you I would think if you're running 2 batteries in parallel you would need them communicating with each other?
August 11, 20232 yr 2 hours ago, PsyCLown said: Do you really think its critical for comms between the battery and inverter? @PsyCLown, definitely not critical. In fact, I have seen a few occasions where the 'wrong / incorrect' comms between battery and inverter causes endless issues. My firsthand experience with 5kW Sunny Island and later 8kW Sunsynk which always worked very reliable just using voltage settings. A number of friends are using using voltage settings on 48V and 24V Axpert type inverters which also just work without any issues. For a DIY battery, using voltage settings opens up the choices of BMSs. I used 300A JBD BMSs (in 5 builds) and Seplos 200A BMSs (in 7 builds). Except for 2 of the Seplos builds which use battery/inverter comms, the rest are all running reliably using voltage settings. I don't want to hijack this thread so please start a new thread to further discuss or PM me if you need more information or assistance in sourcing a BMS/Cells/Enclosure.
August 11, 20232 yr 9 minutes ago, DeonBez said: @PsyCLown, definitely not critical. In fact, I have seen a few occasions where the 'wrong / incorrect' comms between battery and inverter causes endless issues. My firsthand experience with 5kW Sunny Island and later 8kW Sunsynk which always worked very reliable just using voltage settings. A number of friends are using using voltage settings on 48V and 24V Axpert type inverters which also just work without any issues. For a DIY battery, using voltage settings opens up the choices of BMSs. I used 300A JBD BMSs (in 5 builds) and Seplos 200A BMSs (in 7 builds). Except for 2 of the Seplos builds which use battery/inverter comms, the rest are all running reliably using voltage settings. I don't want to hijack this thread so please start a new thread to further discuss or PM me if you need more information or assistance in sourcing a BMS/Cells/Enclosure. @DeonBez, I've been running my 48 V LBSA battery on voltage settings for two years now, no issue so far, pretty satisfied with the way the Seplos BMS controls the voltage and once the cells reach 3.5 V starts to equalize. I still get SOC to 99% it's been like that from day 1, there is one cell out of the 16 that never get over 3.46 V but my battery health still shows 100% see attached dashboard. I charge the battery at 36 Amps and voltage set at 56 V as per OEM specification. All the information on this dashboard is retrieved from the Seplos BMS using Modbus protocol.
August 11, 20232 yr 2 hours ago, cp69 said: I'm about to order a seplos v3 bms. It's going to be around 3k landed in SA for the 150A. I can add one for you I would think if you're running 2 batteries in parallel you would need them communicating with each other? Maybe give this video a watch before you make the purchase, rather make an informed decision and know what you're getting yourself into. I am not saying don't go for the Seplos, just be informed.
August 11, 20232 yr 1 hour ago, PsyCLown said: Maybe give this video a watch before you make the purchase, rather make an informed decision and know what you're getting yourself into. I am not saying don't go for the Seplos, just be informed. That's why I'm sticking with the version 2 bms. It works so well with the sunsynk inverters. Andy just had a few issues but mainly because of the victron
August 11, 20232 yr My issue with using voltage settings 1. State of charge not accurate 2. Parallel battery communication 3. I prefer the bms to dictate to the inverter how it wants the battery to be charged. This helps with the passive balancing and absorption. Yes voltage settings can still work but there's benefits to having communication.
August 11, 20232 yr On 2023/07/29 at 9:29 AM, cp69 said: I'm going for the 230ah cells. First diy battery attempt. Just deciding what bms to use Let us know when your stuff arrives and how it all looks if you don't mind.
August 11, 20232 yr There is already a module that @BritishRacingGreenhas made as open source for the JBD BMS comms to a Sunsynk. It has been in operation for the last 3 months without any issues.
August 11, 20232 yr 3 minutes ago, Steve87 said: There is already a module that @BritishRacingGreenhas made as open source for the JBD BMS comms to a Sunsynk. It has been in operation for the last 3 months without any issues. @Steve87 thank you for sharing. If possible, please provide a link or thread with more information.
August 11, 20232 yr @BritishRacingGreenplease can you send us a link for such...the only reason he can't build this for people is that I am keeping him too busy on Solar projects 🤣🤣🤣 He has provided the entire blue print so that someone can benefit from this project in the absence of him having time to build the module. I will post the link that he has very kindly built for one of my Installs. It's a 280ah EVE DIY build and is paired with a Sunsynk 12kW Inverter.
August 11, 20232 yr Check out page 2 of this thread. @Raj35is also currently building one of these modules as provided by @BritishRacingGreen. The entire module as described in the long post from the above on page 2 of this link. https://powerforum.co.za/topic/18165-12kw-sunsynk-24-x-475w-akcome-bi-facial-solar-panels-15kw-eve-jbd-lfp-pack-with-battery-comms-to-the-sunsynk/
August 11, 20232 yr For the JK BMS people as well I have the CAN bus JK BMS protocol document as well as the Sunsynk Modbus document. @BritishRacingGreencan provide this comms integration. But I have him quite tied up with ATESS installations but I'm pretty sure the same module can be built while he is preparing the integration. I myself have not ever used JK BMSs however, having the correct docs & Guru like we have on this forum anything is possible. I have maybe put the cart in front of the horse here. Maybe we should ask @BritishRacingGreenif he can accommodate such because as I know the man is very busy & I know much the same as me we view the forum as a community type of effort.
August 12, 20232 yr @Steve87 yes we are currently busy with this build appreciate your support. @BritishRacingGreen his extensive knowledge is golden and his layout are simple to follow I know Steeve keeps you busy and appreciate you assistance with this.
October 12, 20232 yr Received my cells yesterday. They look great. Not a single mark. Definitely grade A. I was surprised that they even included 4 pieces of seperation material in each box. Will begin capacity testing next week.
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