I finally got delivery of all my parts from china, partly due to me been busy, and partly due to delivery times
So I have 4 x 100ah CALB cells, which I've top balanced over the last couple of days. and a Bluetooth\USB enabled BMS. All of which are wired up and working quite nicely with my old 12v UPS.
So now time to start fine tuning. I'm using the android app and the default settings are
Overvoltage: 3.75v
Overvoltage Release: 3.6v
UnderVoltage: 2.7
UnderVoltage Release: 3.0
Discharge Overcurrent 30.0a
Cycle Capacity : 16ah
Nominal Capicity : 20ah
Open Balance - open
Balance Mode - charge balance
Balance turn-on 3.4v
Balance Precision 0.015v
Hardware Overcurrent protection 70a
Hardware short circuit protection 445a
Okay so straight away the nominal capacity is 100ah, but I'm thinking of charging 20-80 so does the Cycle Capacity need to be 60ah?
The BMS is a 20amp model so it makes sense to change the Discharge Overcurrent to 20amp??
Both the undervoltage settings are as high as they can go which is a little disappointing, however I can change the Overvoltage to 3.6v and 3.5v ?
While on the subject I vaguely remember someone logging data with a Pi Zero connected to either the Bluetooth or USB, can anyone point me to the project, ideally I want to log BMS information along with a sonoff POW before and after the UPS to see what sort of efficiency I'm getting.
The sonoff units can also then be used to control the load and charging to preserver the battery.
So I have 4 x 100ah CALB cells, which I've top balanced over the last couple of days. and a Bluetooth\USB enabled BMS. All of which are wired up and working quite nicely with my old 12v UPS.
So now time to start fine tuning. I'm using the android app and the default settings are
Overvoltage: 3.75v
Overvoltage Release: 3.6v
UnderVoltage: 2.7
UnderVoltage Release: 3.0
Discharge Overcurrent 30.0a
Cycle Capacity : 16ah
Nominal Capicity : 20ah
Open Balance - open
Balance Mode - charge balance
Balance turn-on 3.4v
Balance Precision 0.015v
Hardware Overcurrent protection 70a
Hardware short circuit protection 445a
Okay so straight away the nominal capacity is 100ah, but I'm thinking of charging 20-80 so does the Cycle Capacity need to be 60ah?
The BMS is a 20amp model so it makes sense to change the Discharge Overcurrent to 20amp??
Both the undervoltage settings are as high as they can go which is a little disappointing, however I can change the Overvoltage to 3.6v and 3.5v ?
While on the subject I vaguely remember someone logging data with a Pi Zero connected to either the Bluetooth or USB, can anyone point me to the project, ideally I want to log BMS information along with a sonoff POW before and after the UPS to see what sort of efficiency I'm getting.
The sonoff units can also then be used to control the load and charging to preserver the battery.