LIFEPO4 Battery discussion thread

denmendez65 said:
FYI for those interested in the 15kWh five star battery. It has a PACEBMS 200A
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Most of these batteries hace Pacebms. Only the proprietary brands like Sunsynk might have something different but all these budget well priced batteries have pacebms.

Which also means passive balancing so if you start with a 4Ah imbalance because the battery was standing in the shops or warehouse it will take a long time to clear.
 
cavedog said:
Most of these batteries hace Pacebms. Only the proprietary brands like Sunsynk might have something different but all these budget well priced batteries have pacebms.

Which also means passive balancing so if you start with a 4Ah imbalance because the battery was standing in the shops or warehouse it will take a long time to clear.
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I feel the imbalance thing isn’t really a big problem. We are just finicky with it as we like to meddle with stuff.

If the array is sized correctly and you spend 80% of the year fully charging everyday the imbalance should take care of itself, even with a cheap PACE BMS
 
denmendez65 said:
I’m sure it has one or maybe it doesn’t and that’s why it’s priced the same.

I would never trust lithium without bms.
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I never said it doesn’t have a bms. It 100% has a bms. I’ll even put my cock on a block im that confident it has a bms.
I should have said why does bms make matter to avoid confusion.
 
cavedog said:
Most of these batteries hace Pacebms. Only the proprietary brands like Sunsynk might have something different but all these budget well priced batteries have pacebms.

Which also means passive balancing so if you start with a 4Ah imbalance because the battery was standing in the shops or warehouse it will take a long time to clear.
Click to expand...
And has a 3.7V OVP
 
If you guys like to tinker with some YAML or you good at copy and paste and a bit of AI, take a look at this project. I have been running this for about a year and it works well for me. You can mix and match different BMS's and it controls charging etc. I bought an M5stack ESP32-S3, a M5stack CAN base and a RS485 isolated module from here (https://m5stack.com/). Next upgrade with be the Lilygo T-Connect (https://lilygo.cc/products/t-connect), more powerful and has more connections. On my current setup I have the SunSynk inverter, A DIY 14.3kw Seplos lithium battery, a DIY 14.3Kw JK inverter BMS and then I have the Victron Smart Shunt all connected to the M5stack (Victron and JK via Bluetooth, Seplos via RS485, CAN to inverter.
It does require Home Assistant so that might put people off but I love it, I am not very clued up on all this but the guys have really helped me on the forum especially the developer @Sleeper85

YamBMS

Currently the JK is not connected.
 

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Greglsh said:
If you guys like to tinker with some YAML or you good at copy and paste and a bit of AI, take a look at this project. I have been running this for about a year and it works well for me. You can mix and match different BMS's and it controls charging etc. I bought an M5stack ESP32-S3, a M5stack CAN base and a RS485 isolated module from here (https://m5stack.com/). Next upgrade with be the Lilygo T-Connect (https://lilygo.cc/products/t-connect), more powerful and has more connections. On my current setup I have the SunSynk inverter, A DIY 14.3kw Seplos lithium battery, a DIY 14.3Kw JK inverter BMS and then I have the Victron Smart Shunt all connected to the M5stack (Victron and JK via Bluetooth, Seplos via RS485, CAN to inverter.
It does require Home Assistant so that might put people off but I love it, I am not very clued up on all this but the guys have really helped me on the forum especially the developer @Sleeper85

YamBMS

Currently the JK is not connected.
Click to expand...
Is this like the iBMS?
 
I am not to sure about the iBMS, I think with iBMS you buy the hardware and software from the same guy, I did see it on Andy's YouTube, but if I remember correctly it was expensive as I think you need 1 per battery or something like that. This is open source, you basically just have to get the correct hardware and then I compile the firmware on my pc with esphome installed and a custom YAML file that you get from the GitHub site. I had no idea what I was doing so the developer setup my YAML file and off I went I have slowly started to learn the config, I am running the dev version which is 1.7.0 which will be the stable version very soon.
 
denmendez65 said:
The first part could refer to the cells themselves and the 200A max could be the BMS limit. But yeah, not a good look.

This battery is better than the fivestar one. 10 year warranty and has a "better" balancer than the fivestar unit.
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Also, the experts should mention how many amps the balancer is but it is refreshing finally seeing active balancers.
 
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