Battery Connection - MPP Solar MPI 12KW WP User Manual

7. Battery Connection

CAUTION: Before connecting to batteries, please install separately a DC circuit
breaker between inverter and batteries.
NOTE1: Please only use sealed lead acid battery, vented and Gel battery. Please check
maximum charging voltage and current when first using this inverter. If using Lithium
iron or Nicd battery, please consult with installer for the details.
NOTE2: Please use 60VDC/300A circuit breaker.
NOTE3: The overvoltage category of the battery input is II.
Please follow below steps to implement battery connection:
Step 1: Check the nominal voltage of batteries. The nominal input voltage for inverter is
48VDC.
Step 2: Use two battery cables. Remove insulation sleeve 12
mm and insert conductor into cable ring terminal. Refer to
right chart.
Step 3: Remove battery cover and follow battery polarity guide
printed near the battery terminal! Place the external battery cable ring terminal over the
battery terminal.
RED cable to the positive terminal (+);
BLACK cable to the negative terminal (-).
WARNING! Wrong connections will damage the unit permanently.
Step 4: Make sure the wires are securely connected. The reference tightening torque is
5.5~7.0 N.m.
WARNING! It's very important for system safety and efficient operation to use
appropriate cable for battery connection. To reduce risk of injury, please use the proper
recommended cable size as below.
Model Nominal Battery
MPI 12KW
WP
MPI 15KW
WP
Conductor cross-
Voltage
48V
48V
section (mm 2 )
107
151
13
AWG Protective earthing
no. (battery side)
4/0 150mm 2
300 150mm 2
(300kcmil)
(300kcmil)