I’m down in warmer Yuma now, no further issues.
The only other change I’ve made is that the BMS is ratcheting down the battery capacity when I don’t charge to 100% every day. I did reset that. I’m currently charging to 13.7v on the Victron with a two hour absorb time.
The battery box I...
They started diverging again after 15 minutes under a mild load. Load was switched off before disconnect. At 20 minutes they may have ‘stabilized at 2.37 and 4.12. They now appear to be leveling again, with no load.
Cells were roughly at 2.6v and 4.0v. They are now at roughly 2.9 and 3.6 after a half hour. The high cell has been one consistently but modestly out of balance, ~60 milivolts.
Strangely, I have one cell triggering an under voltage disconnect and another triggering an over voltage disconnect.
I presume the error has something to do with the average between the two cells, but that’s pretty vague.
The bms is a jbd, 4 cell 280ah battery about 1.5 years old. I...
One way to think about the comparison is that lead acid only gives you 50% of capacity while your application is estimated at only using 80%. In addition note that heat is also damaging to LFP.
Lastly do note that charging up to 100% on occasion, say in advance of a Hurricane, would be...
There are possible issues with two batteries on a single controller.
The issue I’m aware of is that both batteries need to be relatively similar in capacity, age etc. Matched and balanced, if you will. This would apply to both a series and parallel connection between the two batteries. This...
As I understand it the Growatt is popular with 48v residential folks.
I too am looking at 24v, as an upgrade on my current system. I’m not convinced of the benefits of a combined inverter/charger over a separate component system. Following.
You could always lower the settings on the BMS, if possible, to a slightly more conservative setting. It is preferred to have this done by the charger by most. At the very least the BMS can act as training wheels while you figure out what is going on.
In a similar regard lower amps will be...
Check out Will Prowse’s YouTube reviews, prices have gotten cheaper. If you controllers will do 24v and you can series up your panels the 24v server rack batteries might be the best. 5kwh for $1500 and up.