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diy solar

Trying to match settings of overkill bms to what i have on inverters

Bleedingblue

Solar Enthusiast
Joined
May 12, 2020
Messages
544
I have 6 strings of 280AH batteries on a 48 volt system. Last weekend I installed my 4 mpp 5048MGX inverters and programmed them to charge the way that off grid solar recommended on his site.
I tried looking at his bms settings and match them into the overkill but get confused on the language used. It could be the covid I've been sick from his week I dunno. But each battery bank seems to be off dramatically from each other even though they are all connected to a common bus bar.

The only thing I can think of that is effecting each pack is the settings on the bms. The only thing I've done is change it from. 100AH pack to 280AH and it automatically assumed 80% use at 224AH. That's all I've done on the bms. Oh also tried to change the names of the packs to know which ones which but won't work behind the first one. You know change the name unlink and hit refresh 2x . I've done that many times. Even Uninstalled the app and still didn't work.

These are the settings I used on the inverters


I also want to use the settings he has below the inverter settings in my overkill bms.






Screenshot_20220819-115029_xiaoxiang.jpgScreenshot_20220819-115047_xiaoxiang.jpgScreenshot_20220819-115125_xiaoxiang.jpgScreenshot_20220819-115149_xiaoxiang.jpgScreenshot_20220819-115220_xiaoxiang.jpgScreenshot_20220819-115238_xiaoxiang.jpg
 
I had no problem changing the names of my BMS from within the app. As I recall, there is a icon to save the change. It's been a couple years though.

For the parameter setting, I have my charge devices set lower than the BMS. For example, the BMS my have a high voltage disconnect at 14.6 volts but the charger only goes to 14.2 volts.
 
I had no problem changing the names of my BMS from within the app. As I recall, there is a icon to save the change. It's been a couple years though.

For the parameter setting, I have my charge devices set lower than the BMS. For example, the BMS my have a high voltage disconnect at 14.6 volts but the charger only goes to 14.2 volts.


Does your show the wild imbalances between battery banks? My settings are stock on the bms except for the 280AH.
 
You can see my cells and batteries. The batteries should all be equal since they are charged by a common bus bar.
 
I did find out something after messing around with the app. I fixed the wild differences between packs.


Screenshot_20220820-195822_xiaoxiang.jpgScreenshot_20220820-195831_xiaoxiang.jpgScreenshot_20220820-195839_xiaoxiang.jpg


All the packs read the same now
 
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