Ohms_Cousin
New Member
- Joined
- Nov 6, 2020
- Messages
- 59
Given the latest data suggests that charging up to 3.4v max can result in more cycles from the batteries (life span) is it feasible to use 17 3.2v cells in series for a 48vnom setup using a Victron Inverter ? Victron can accept up to 66v. 17 x 3.4v = 57.8v, 18 x 3.4v = 61.2v. If we charge up to 3.6v before a disconnect of charging then we could hit (17 x 3.6v) = 61.2v or if 18 cells we could hit (18 x 3.6v) 64.8v.
It gets close to the victron input limit, so some protection needed. A cut off relay driven by a sensor to cut off at 64v maybe?
Why? Need to pack as much energy into a tight spot as I can. If I do the usual 16S then I lose some capacity with cells that may not deliver the full amp/hrs and then if I only charge to 3.4v there is a little lost there, then there is the 10-15% at the bottom of the discharge cycle that I do not want to use.
All in all if I could put at least 1 extra cell in to make a 17S then I can at least compensate for some of the losses.
Of course the BMS must be able to support a 17 or 18S setup.
Is anyone doing this ?
It gets close to the victron input limit, so some protection needed. A cut off relay driven by a sensor to cut off at 64v maybe?
Why? Need to pack as much energy into a tight spot as I can. If I do the usual 16S then I lose some capacity with cells that may not deliver the full amp/hrs and then if I only charge to 3.4v there is a little lost there, then there is the 10-15% at the bottom of the discharge cycle that I do not want to use.
All in all if I could put at least 1 extra cell in to make a 17S then I can at least compensate for some of the losses.
Of course the BMS must be able to support a 17 or 18S setup.
Is anyone doing this ?
