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LG Chem RESU Batteries

LG chem is one of the world's largest lithium-ion battery manufacturers with 29,000 employees and manufacturing facilities in South Korea, China and the US. Their large range of stationary lithium battery systems has positioned them as one of the industry leaders in home solar battery systems and larger commercial energy storage (ESS) installations.

LG Chem RESU Tech Specs

  • Battery Type: DC coupled battery system (48V and 400V options)
  • Cell Chemistry: Lithium NMC pouch cells
  • Sizes available: 6.5kWh, 9.8kWh, 13kWh, (New 16kWh)*
  • Usable Capacity: 90% capacity, (100% for 16kWh)*
  • Power output - 5kW continuous, 7kW peak (11kW for 16kWh)*
  • Cycle life: up to 4000 cycles (claimed) - Ref warranty doc
  • Price: approx $7000 (RESU10), $8000 (RESU10H)
  • Warranty: 10 years - Ref warranty doc

The LG RESU Battery Range

The RESU or 'Residential Energy Storage Unit' range consists of both 48 volt and higher voltage 400 volt lithium-ion battery options.
The 48V (LV) series is available in 3 sizes - 3.3kWh, 6.5kWh, 9.8kWh and 13kWh.
The 400V (HV) batteries are available two sizes - 6.5kWh and 9.8kWh.
A new Gen3 16kWh high-voltage battery was released in late 2020

All size figures are based on the total available capacity (kWh), however usable capacity is limited to 90% for the 48V version, and 95% for the 400V series. For larger residential systems a maximum size of 19.6kWh can be achieved by linking two of the 9.8kWh (RESU10) battery units together using the LG RESU plus battery combiner unit - the RESU plus.

LG Chem 48V RESU battery Specifications

All LG Chem RESU batteries are IP55 weather-rated. The batteries can be installed in a semi-outdoor location  but it is not advisable to be installed in a place exposed to direct sunlight as excessive and prolonged heat will be detrimental to the performance and life of the system.

Download the detailed LG chem specification data sheet here

High Voltage Battery options (400V)

An emerging trend towards higher voltage 300 - 400 Volt battery systems is seen nowadays as these systems have several benefits over the traditional ELV 48V batteries. They have increased efficiency, lower cable losses and the ability to be DC coupled with the solar array which operates at a similar voltage. However, all dedicated off-grid battery inverters operate within the traditional 48V range so the higher voltage batteries will generally not work for off-grid installations.

New for 2020 - Gen3 RESU 16H

LG released their third-generation (Gen3) battery system, the RESU 16H in October 2020. Demand has been growing rapidly for larger, more powerful battery systems which can compliment the movement towards all-electric-homes and electric vehicle charging. The Gen3 RESU battery from LG Chem addressed the limitations of previous gen batteriers with a much greater 16kWh storage capacity and higher continuous power rating of 7kW. The most significant boost is in regards to peak power which has increased to an impressive 11kW. The larger peak power rating means the backup loads on a typical household can now include high-surge power appliances like pumps and air-conditioners. The new Gen3 RESU 16H battery is the largest and most powerful residential battery from LG chem

More power = more weight

Wide range of compatible inverters

LG Chem has been working with many inverter manufacturers to ensure their product is compatible and easily configured with almost all of the best and most popular hybrid and off-grid battery inverter/chargers on the market. Their range of compatible inverter brands for the RESU range (LV) now includes a vast range of 48V hybrid and off-grid inverters.

All-in-one Hybrid Inverters - 48V

SolaX Power hybrid

Ingeteam hybrid

Sungrow SH5K-20 hybrid

Goodwe SE

Off-grid / Hybrid Inverters - 48V

Selectronic SP PRO

Victron Energy

SMA Sunny Island

Hybrid Inverters - HV 400V

SolarEdge Storedge

SMA SBS-2.5 and SBS-5.0

Huawei SUN2000L

Fronius Symo

LG chem are also working closely with several leading inverter manufacturers including SMA, Fronius and SolarEdge and will be delivering an even greater range of battery options throughout 2020.

Safe Laminated Lithium Polymer Cells

As opposed to many other manufacturers which use cyclindrical battery cells LG chem use a unique Polymer 'pouch' flat laminated battery design (PH3) which LG claim enables much higher energy density with increased reliability and safety. Layering the battery cell sections rather than rolling or bending the cell structure reduces the likely hood of failure and enables even heat dissipation across the cell area.

Fire Safe - The LG chem lithium modules have been fire tested to the UL1973 test standard which requires there to be no explosion or sign of fire when the battery cells is forced into a thermal runaway condition.

LG Chem Warranty

The LG chem RESU warranty is 10 years which is based on 2 main factors, the remaining capacity and energy throughput based on charge and discharge cycles. All batteries reduce capacity over time due to internal cell degradation, the LG chem warranty ensures the retained storage capacity is greater than 60% of the original amount.

See the full LG chem warranty document here

Careful in hot climates

The warranty also contains detailed operating criteria which limits the operating temperature and energy throughput over the battery life. This can be problematic for installations in hotter climates such as regional Australian towns and remote locations. Since exposed outdoor installation can easily reach 45 degC during the afternoon in many Australian towns, careful consideration needs taken when locating the battery. Preferably locations include inside a garage or a well insulated/ventilated area as high ambient temperatures above 45 degC can accelerate battery aging and reduce storage capacity.

The LG RESU batteries have built-in sensors to monitor cell temperature and voltage to help extend battery life. To reduce degradation or the chance of thermal runaway the LG battery management system de-rates the power output by 50% once the internal cell temperature rises above 50 degC and further de-rates power output completely once the temperature goes above 55 degC. 

LG Commercial & Utility scale batteries

LG chem also supply a range of battery units designed for high capacity rack mount commercial and utility energy storage systems with long duration applications (greater than 1 hr). These are made up of 52V modules which are connected in series to create modular and scalable high voltage (LV) energy storage systems.

LG chem have a range of ‘Power modules’ designed for high output short duration applications (less than 1 hour) which are ideal for commercial installations where ‘peak lopping’ (also known as peak shaving) is required to maintain power draw from the mains below a preset level. This reduces strain on the electricity network and eliminates the extremely high usage charges associated with peak demand that cannot always be reliability sustained by the mains supply.

The large scale storage systems can also be utilised by utility companies to help balance the electricity grid during peak times and of course help with the transition to a renewable energy power grid.


LG chem RESU is one of the best battery systems on the market with an extremely good reputation for quality and affordability. The RESU’s success is based on several factors, including the unique cell design, safety, performance, and service backed by a huge multi-national company.

The only concern is in regards to systems installed in high-temperature environments or exposed locations. Prolonged high temperatures above 40 degC or direct sunlight could result in reduced performance or even system shutdown to prevent overheating. Another issue is the battery will automatically shut down after a short amount of time if communication is lost with the inverter. However, this is only problematic with off-grid systems.

LG Chem stands out from the crowd of lithium battery manufacturers due to high build quality, value for money, diverse range of batteries, and compatibility with most leading inverters on the market. On the service side, the high level of industry interaction, training and support, has helped improve reliability and ensured the RESU systems are installed correctly.



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