On-Grid & Back-Up Connection - LG LGES-5048 User Manual

Battery Protection
Battery will provide charge/discharge current limitation under the following conditions:
• Battery SOC is lower than I-DOD (Depth of discharge).
• Battery voltage is lower than discharge voltage.
• Battery over temperature protection.
• Battery communication is abnormal for lithium battery.
• BMS charge/discharge limitation.
When charge/discharge current limitation protection happens:
• Battery charge/discharge operation could be abnormal.
• Under grid outage condition, Back-up supply will shutdown.
• It is not allowed to use the inverter in a pure off-grid scenario.
Note:
• The inverter and battery cannot be used in o -grid designs
• Under on-grid mode, battery is protected from over discharge by DOD and discharge voltage.
• The DOD setting of a battery prevents the inverter from discharging battery reserve power. As soon as
the DOD is reached the load of building will only be supported by either PV power or the grid. If there
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are continuous days when little or no battery charging occurs, the battery may continue to self-con-
sume energy to support communications with the inverter.
2.4.3 On-Grid & Back-Up Connection
An external AC breaker is needed for on-grid connection to isolate from grid when necessary. The
requirements of on-grid AC breaker are shown below.
Inverter model AC breaker specification
LGES-5048 40A / 230V (e.g. DZ47-60 C40)
Note: The absence of AC breaker on back-up side will lead to inverter damage if an electrical
short circuit happens on back-up side.
1. Use separated AC breaker for individual
inverter.
AC Breaker AC Breaker
AC Breaker
2. On the AC side, the individual breaker
should be connected between inverter
and Grid but before loads.
AC breaker
Loads
Grid
AC cable is required to connect to both on-grid and back-up side.
Make sure the inverter is totally isolated from any DC or AC power before connecting AC
cable.
Note:
1. Neutral cable shall be blue, line cable shall be black or brown (preferred) and protective
earth cable shall be yellow-green.
2. For AC cables, PE cable shall be longer than N&L cables, so in case that the AC cable slips or
is taken out, the protecting earth conductor will be the last to take the strain.
Step 1
Prepare the terminals and AC cables according to the right table.
A
Step 2
Put AC cable through terminal cover as shown
in the figure.
Note: Please use the terminals in accessory
box.
Step 3
Press the 6 connectors on cable conductor core tightly.
Note: Make sure cable jacket is not locked within the connector.
Grid
B C
Grade Description
A Outside diameter
B Separated wire length
D
C Conductor wire length
D Conductor core section
Screw Cap The Insulator
Cable Single Hole Seal Ring
Value
13-18 mm
20-25 mm
7-9 mm
4-6 mm
2
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AC Cover
Connection Terminal