Narada NPFC Series Operation Manual page 9

Fig. 4-2 Layout of paralleling connection for NPFC Series Batteries
4.Power on for battery module
■ When installation is accomplished, battery module is in dormant state. Once power on for the
power plant and battery module, battery will go into normal running status, and discharge/charge
can be available.
■ Parameter settings for lithium battery modules in power plant are shown in Table 3-1.
5.RS232/RS485 communication connection
■ If there is only one battery module in operation, communication between battery module and
computer can available through RS485.
■ If there are more than one battery modules in operation, parallel communication can be available
using RS485.
■ The last battery in each rack have an empty RS485 port for CAN cable terminal resistor. The other
end of communication cable, use the electric tape to seal it.
■ RS232 communication port just for software upgrade.
■ Communication protocols for RS485 are shown in Annex 3.
■ Dry contact should be connected when battery connected in electric circuit.
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Fig. 4-3 How to handle the empty RS485 port for NPFC Series Batteries
6.Discharge with dummy load
■ Dummy load cannot be larger maximum discharge current of each battery model according to the
datasheet, and BLVD is larger than 43.2V.
■ Voltage drop on cable between battery module and power plant shall be less than 0.5V. Method of
calculation for cross sectional area of cable is shown as below.
A=ΣI×L/(K×△U)
In the above formula, A is across sectional area of wire (mm2), ΣI is the total current (A), L is length
of cable, △U is the permit voltage drop on cable (V), and K is electrical conductivity of wire. For
example, for copper, K = 57.
NPFC Series
LiFePO Battery Module for Telecom
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