RESU Salesbook

4. Deep Discharged Battery & Charging Caution Letter
Introduction
This guide covers units with the AUX switch, before Disconnect Switch is applied,
with production serial numbers in the table below.
※ For Europe region,
Disconnect switch is applied to RESU HV(Type-R) models based on manufacturing date written below.
- RESU7H(Type-R) : 21th, Sep, ’18 and forward
- RESU10H(Type-R): 24th, Nov, ’18 and forward
Dear Valued Customers,
LG Chem has addressed this potential concern for all new production RESU HV (Type R) batteries
since late 2018 by adding a new smart BMS controlled breaker for additional protection.
Since 2017 LG Chem has notified the market with bulletins, product stickers and updated user manuals
explaining the ways to protect already installed batteries from potentially becoming deep discharged.
This letter serves a reminder to installers and also the system owners of how to ensure this models battery
is not deep discharged in a protection mode due to the Auxiliary (AUX) power drawing small amounts of energy
over time during a system fault state stopping the system’s ability to charge the battery.
Reminder
1. The Battery DC/DC Circuit Breaker must be turned OFF first and then
importantly the AUX Power switch turned OFF second for any of the below cases immediately
then contact your installer or LG Chem to resolve the fault.
Potential States where system must be turned off
• System not operating immediately after installation and commissioning test
• Battery DC/DC Circuit Breaker (CB) is automatically tripped by fault diagnosis
• DCDC Converter Link Overvoltage (Ex. inverter error code: 3 or 8)
• Communication fault between the inverter and the battery. (Ex. error code : 3x6b)
• Failure of remote firmware update
• Failure of an inverter or PV system
• In case of not using the battery (Ex. When leave home for a long time)
• In case of turn off the battery for any other reasons
Product (Type-R) Production Before Battery Serial No. Before
RESU10H September 17
th
2018 R15563P3SSEG11809179045
RESU7H September 19
th
2018 R11163P3SSEG11809199001
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