Once the battery is fully charged, adding more electrons causes dendrite growth. OSLT...
No its will not.
Float do not mean it charge somting.
And a bms will stop this if the cell go up.
My float is 13.9volt on the battery .
And it stay that way till the sun go down.
No amps go in the battery if it hit the 13.9volt wall
It just stop charging.
If somtings go on like a inverter the solar system and the battery will be use on that moment.
But if you always draw power from the systeem even if the battery is full and the Float option is on.
Nothing will happen it go to the systeem what use power on that moment
Energy do the same like water.
It always go to the place with les resistance.
A battery you have to Pump in .
A lamp light pul out of the systeem so it flows to that direction.
On the moment both are on the same volt the charge and the battery the flow will stop .
Only a lead battery have a problem.
A lead battery is slow discharge so it need to be charge or it go slow empty.
And if you always Float charge and do not have a user than a lead battery will kill it self. (Reason a drip charger is use )
But normal you charge a battery wilt solar and use that energy in the night .
So you have always a discharge.
If you use the battery for backup only .
A lead battery need drip charger and lipo4 do not need this it have not self discharge. (Bms and bluetooth will slow discharge)
I have 30ah lipo4 backup portable unit .
Its now 70% charge the last time i have charge this unit is summer 2023 ( 1 year ago) on 100%
The discharge is from the bms unit that use some power draw to function.
Reason float option is not need on the lipo4 is that the cells will not discharge .
It only discharge thanks to a bms and the Bluetooth systeem beult in.
So that unit will always use some energy .
But the company that makes the battery are not the one that makes the bms and more .
That is for the company and user setting to use.
Float a problem ?
No not if you have user running from the battery systeem .