I will give an example of how I connected Lifepo4 batteries to the EPS30-4815AF power supply (it contains two 15A power modules).
For example, the first battery was US2000C Pylontech 50Ah 48V.
First of all, you need to look at the maximum permissible battery charging voltage, for example, for US2000C it is 53.5V, and the EPS30-4815AF power supply by default supplies equalizing 56.5V (function for lead-acid batteries), and floating 53.5V. The US2000C has 15 3.2V cells instead of 16, so you have to be careful that the power supply doesn’t supply more voltage than it can handle.
The floating voltage in EPS30-4815AF cannot be disabled, or rather, it can be disabled until the power supply is rebooted or until it is reconnected to the OLT, since when connected, the charging mode will return to automatic.
Also, in order for the charging voltage to change after executing the commands, it is necessary to disconnect the communication cable so that the OLT loses connection with the EMU (EMU state: failed), then connect it, without this the voltage will not change, you can only change the charging mode:
display emu
display emu 3
...
EMU state : normal
...
interface emu 3
display power run info
display power system parameter
power charge mode floating
power charge mode automatic
Example of voltage change for equalization and float charging for Lifepo4 battery US2000C Pylontech (the values I specified):
power charge voltage equalizing-voltage 53.1
power charge voltage floating-voltage 53.0
Example of indicating the charging current (60 * 0.25 = 15A):
power battery parameter 1 0.25 60 60
I would like to note that when turned on, the EPS30-4815AF can deliver a 30A surge of current to the battery, and after a few seconds it levels out to the set value, so in the EPS30-4815AF, I had to replace the battery fuse with a 25A one, the factory one was 20A.
display power system parameter
EMU ID: 3 Power system information
------------------------------------------------------------------------------
Charge control state: Automatic control
Equalizing voltage : 53.00V Floating voltage : 52.90V
Charge Lmt quotiety : 0.25 Equalizing time : 60 days
Battery number : 1 Battery 0 capacity : 60 AH
Batt_temp_test_upper: 80 C Batt_temp_test_lower : -20C
Batt_temp_Alam_upper: 50 C Batt_temp_Alam_lower : -15C
Temp redeem quotiety: 80mV
Batt temp Monitor : Enable
AC over alarm voltage : 280V AC lack alarm voltage : 180V
DC over alarm voltage : 58 V DC lack alarm voltage : 45 V
Power module number : 0
Load off permit : Forbid Load off voltage : 44.00V
Battery high-temperature-off permit : Permit
Battery high-temperature-off temperature: 53 C
Battery-lack-voltage-off-permit : Permit
Battery-lack-voltage-off voltage : 43.00V
Battery barcode : -
Load off voltage – load shutdown, the power supply remains on, Battery-lack-voltage-off voltage – battery shutdown and power supply shutdown, this voltage must be higher than the voltage at which the BMS is turned off, otherwise, for example, in order to start charging the battery later, you will have to press the OFF / ON switch on it, it itself may not start. Unfortunately, on different Huawei OLTs, you can specify a value no higher than 44.9V (checked on MA5683T and MA5800) or 44V (checked on MA5608T). Moreover, the power supply turns off with a delay of several minutes, during this time the battery voltage will drop even lower. I also tested the 4830 power supply from another manufacturer, there you can specify a higher voltage at which the power supply is turned off and there is a web interface for remote configuration, but there are some nuances and bugs. Also on test is Huawei ETP4860-B1A2-30A (smu11b) with one R4830G 30A power module, you can install a second backup and have 60A.
power off battery-off-voltage ... (default 43V)
power off battery-off-state <permit,forbid> default permit
display power environment parameter
display power run info
EMU ID: 1 System run information
----------------------------------------------------------------------------
Limit State : No limit Charge control : Automatic control
Charge state : Floating
Module number : 2
Module 0 address : 1 Module 0 type : AC/DC
Module 1 address : 2 Module 1 type : AC/DC
Module 0 voltage : 53.51V Module 0 current : 0.83A
Module 1 voltage : 53.46V Module 1 current : 0.83A
DC voltage : 53.45V AC voltage : 234.17V
Load current : 1.39 A Battery current : 0.07 A
For example, the floating voltage can be specified as 3.45V per cell, and the boost is no more than 3.6V, it depends on the cells and you need to make sure that the power supply correctly sees the battery capacity, so that at 100% charge it uses only floating charging. There was a case when the power supply saw that the battery was charged by 30%, but in fact 100% and floating charging in this case will never turn on.
It is better to leave the BMS parameters at factory defaults. User and password for the application below version Pylontech Batteryview V3.7 – Administrator/pylontech for Batteryview V3.8 and newer – Pylon2019001!
It is necessary to monitor the battery charging voltage and charging current values via SNMP, OID can be found in my article:
SNMP MIB/OID for Huawei ETP4830
I also ordered and connected Tewaycell 51.2V 50A batteries (Gotion 52ah cells), which had the following parameters:
Maximum charging upper limit voltage 58.4V
Floating voltage: 56.8V
Discharge lower limit voltage 43.2V
Continuous maximum charging and discharging current 50A
I specified the parameters:
power battery parameter 0.25 60 1 60
power charge voltage floating-voltage 55.2
power off load-off-voltage 44.9
power off battery-off-voltage 44.8
power off load-off-state permit
power off battery-off-state permit
power charge voltage equalizing-voltage 56.9
power supply-parameter 280 180 58 46
display power system parameter
EMU ID: 3 Power system information
----------------------------------------------------------------------------
Charge control state: Automatic control
Equalizing voltage : 56.90V Floating voltage : 55.20V
Charge Lmt quotiety : 0.25 Equalizing time : 60 days
Battery number : 1 Battery 0 capacity : 60 AH
Batt_temp_test_upper: 60 C Batt_temp_test_lower : -40C
Temp redeem quotiety: 100mV
Load off permit : Permit Load off voltage : 44.90V
Battery off permit : Forbid Battery off voltage : 44.80V
Shunt quotiety : 100A
AC over alarm volt : 280V AC lack alarm voltage : 180V
DC over alarm volt : 58 V DC lack alarm voltage : 46 V
Power module number : 3
Module 0 address : 1 Module 0 control state: On
Module 1 address : 2 Module 1 control state: On
Module 2 address : 3 Module 2 control state: On
Load high-temperature-off permit : Forbid
Load high-temperature-off temperature : 65 C
Battery high-temperature-off permit : Forbid
Battery high-temperature-off temperature: 50 C
If you specify an incorrect value, the following message will be displayed:
Failure:Not match this relation:DC over voltage -1 > equalizing charge voltage >floating charge voltage > DC under voltage +2V,and DC under voltage > Load off voltage > Battery off voltage