Rentech BTESF Series User manual

Version: 1.0 | Date: April 2020 | Rev: 2020/04/02
LITHIUM IRON PHOSPHATE
SOLAR BATTERIES QUICK START GUIDE

INTRODUCTION
CONNECTIONS AND START-UP
DO NOT CONNECT THE RS485 OR RS232 PORTS TO
UNSUPPORTED INVERTERS OR COMMUNICATIONS
DEVICES
Each Lithium Iron Phosphate (LFP) battery has a built-in Battery Management
System (BMS) which controls the charge and discharge voltages, currents,
temperature, state of charge (SOC), state of health (SOH) and safety of the
battery.
It includes a RS485 communication port and DIP switches for parallel operation
and communication with the Rentech Oryx inverter, as well as a RS232 port for
factory and support testing. Communications protocols are custom and can not
be used with other Inverters or RS485/RS232 communication devices unless
approved by Rentech.
Please refer to the User manual for details.
Ensure that you have the correct battery voltage for the charger/inverter.
Do not use a 24V battery on a 48V system or vice versa.
With the charger/inverter off, measure the input impedance on the battery
terminals to ensure there is no short circuit.
Connect the battery positive and negative terminals to the battery terminals
of the charger/inverter using the correct cable size and battery fuses/
breakers ratings. For a single battery, the address DIP switches must be set
to: Off-Off-Off-Off – “0000”.
For multiple batteries in parallel up to 15 maximum, follow the instructions in
the User Manual.
1.
2.
3.
4.
LFP batteries are shipped from factory in a partially charged state and with the
batteries switched off. A high impedance voltage of ~ 8Vdc to 18Vdc on the
terminals are normal and an indication that the battery’s BMS is on, even though
the battery is off.
!
DO NOT CONNECT RENTECH 24V LFP BATTERIES
IN SERIES TO FORM A 48V SYSTEM
!

Connect the RS485 cables from A to B, A to B, etc.
Don’t “daisy chain” the battery cables: Connect each battery’s cables to a
common + and – busbar or terminal.
Address DIP switch settings:
Master battery : 1000
Slave 1 : 0100
Slave 2 : 1100
Slave 3 : 0010
Etc.
(Note it is binary in reverse (mirror image)).
a)
b)
c)
i)
ii)
iii)
iv)
v)
vi)
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Double check that the polarities are connected correctly and all nuts/screws
properly tightened.
Make sure the battery cables are not connected to the inverter’s PV terminals
or the PV cables connected to the inverter’s battery terminals.
With the battery fuse or breaker not connected and the loads on the inverter
disconnected, start-up the battery by pressing down and holding the RESET
button for approximately 3 seconds until the LEDs come on, then release the
RESET button.
The SOC LEDs on the battery will indicate the %SOC and the green RUN
LED will flicker at ~1Hz (1 second). If the red ALM (alarm) LED flickers at
~2Hz (0.5 seconds), it indicates a low SOC warning and NOT that the battery
is faulty. Measure the battery voltage with a voltmeter to determine the actual
voltage.
If the red LED is permanently on, the BMS has detected a health or safety
event and disabled the battery – Contact your supplier or Rentech.
Close the battery fuse/breaker to connect the battery to the charger/inverter.
Switch-on the charger/inverter while checking the battery current with a
clamp-meter to verify it is only the standby power rating of the charger/
inverter.
Program the charger/inverter for the correct battery type (Lithium/User
defined), charge voltage and current and end of discharge (EOD)/low voltage
disconnect (LVD) settings for the specific battery from the table below.
NB: For inverters, ENSURE that the inverter low voltage disconnect value is
set at least 1V (preferably 2V) higher than the battery EOD voltage to ensure
the battery’s BMS does not switch-off the battery under load conditions
before the inverter does. This will enable you to start-up the battery when the
AC power has returned or the PV power is sufficient to re-start the inverter
before connecting loads again.
NB: Before connecting loads, first charge the battery to full capacity to
prevent EOD/LVD disconnect under load conditions due to insufficiently
charged battery.

BATTERIES SPECIFICATIONS SUMMARY
Model: BTESF
Nominal voltage (V)
Rated capacity (Ah)
Total energy (Wh)
Usable energy to 80%DOD (Wh)
Charge voltage¹ (V)
Battery EOD/LVD voltage (V)
Preferred charger/inverter LVD volts
Maximum charge current² (A)
Peak discharge power 3 seconds (W)
Operating temperature (°C)
48V 50-R
51.2
50
2560
2048
55.2
44
46
10
3360
0-50
48V 100-R
51.2
100
5120
4096
55.2
44
46
20
6720
0-50
48V 150-R
51.2
150
7680
6144
55.2
44
46
30
10080
0-50
24V 100-R
25.6
100
2560
2048
27.6
22
23
20
3360
0-50
24V 200-R
25.6
200
5120
4096
27.6
22
23
20
6720
0-50
Notes:
This applies to float and bulk charging. Equalization charging should be
disabled or also set to same charge voltage.
For batteries in parallel, ensure the maximum charger/inverter charge current
is limited to the correct value (or less) of the number of batteries in parallel.
Also ensure that the combined maximum charge current for multiple
chargers/inverters in parallel is correctly limited.
1.
2.
Email: [email protected]
Tel: +27 11 776 4300
140 North Reef Road, Elandsfontein 1429
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