LG RESU placed over a modern room

Most of us are blissfully unaware of LG’s subsidiary, LG Chem, who despite their lack of media attention is a worldwide leader in chemical, plastic, and battery manufacturing.

It is even more unlikely that the average Australian homeowner is aware of LG Chem’s RESU, or Residential Energy Storage Unit.

Yet, the majority of Australians who have bought a home battery in the past few years have chosen to buy an LG Chem RESU. In fact, 30% of all batteries sold in the first half of 2016 were LG Chem units.

So, given that this battery is clearly popular among interested homeowners, why haven’t you heard about it before?

Well, unlike Tesla, LG Chem doesn’t do PR. In fact, their entire marketing strategy boils down to having a good product and hoping people notice.

Thankfully for the unknown giant, it seems like the strategy has paid off. LG Chem now holds nearly US$18 Billion in assets.

With the release of their second generation battery unit, the RESU, LG Chem has become a serious contender for top spot in the race to dominate the burgeoning battery market.

Five different models, two voltage options, and three colour schemes: the RESU offers a buffet of choice to homeowners looking for the right battery.

While Tesla and Sonnen, both great systems, focused on marketing and intelligent monitoring, LG Chem has focused on perfecting one thing and one thing only: it's proprietary Li-Ion battery cell that gives the LG Chem’s battery a longer life, better energy density and all-around improved performance over the competition.

For anyone looking for an easy-to-understand, reliable solution, then look no further than what LG Chem has to offer.

A Buffet of Choice: 5 Unique Models, 2 Voltage Ranges

The LG chem is the everyman’s battery.

While the Sonnenbatterie is the Mercedes-Benz of the industry and Tesla is the, well, Tesla of the industry, the RESU is the Toyota RAV 4: reliable and made to accommodate a wide range of lifestyles.

To that end, LG has built not just one unique solution, but an array of them. That means that no matter what, there is a RESU for your household.

Whether you’re looking for a small 3.3kWh battery in pink for your beach house or a 9.8kWh 400V high-performance monster for the family home, LG has a battery for you.

High Voltage and Low Voltage Models

The LG has produced a low 48V range of batteries and two larger 400V models.

The reason for this is that high voltage Li-ion batteries are arguably better suited for residential use, whereas 48V batteries are more common in telecommunications.

This is because it's generally understood that the higher the voltage, the faster and more efficiently the battery will charge.

As well as this, an HV DC battery is more similar to a solar array and therefore is better suited for residential applications.

That being said, low voltage batteries have been more common up until now, which makes it more likely to find a compatible inverter.

Currently, LG Chem has produced three low voltage batteries and two high voltage batteries, and which battery you choose is important, as each range of products is compatible with a different set of inverters.

Five Unique Battery Capacities

The trick to making the most out of your battery system is to not overinvest in a battery that is too large or underinvest in a battery that is too small.

Getting the best ROI is only possible if you get a battery system perfectly sized for your needs.

By providing five unique battery capacities, LG Chem has given homeowners the opportunity to find the right system.

LG Chem’s most popular models fall within the low voltage range, which you can see below:

LG Chem RESU models lined up

Additional Specs and Details

While each model differs in size, they are all built upon the same core technology.

LG has gone to market with a markedly unique battery cell.

While most others have opted for the standard ‘cylinder cell’, LG has rejected the status quo and instead built a patented battery cell. They say it is more energy-dense and less likely to be damaged during charge cycles.

This image from their site explains it best:

Instead of ‘rolling’ the cells into cylinders, the cell is ‘stacked and folded’, to create a more energy-dense cell.

What LG failed to mention is that by opting out of the cylindrical model, they have avoided dead space both within the cell, but also between the cells.

This has had a huge effect on the size of LG’s battery. While the Tesla Powerwall is more than a meter tall, the largest RESU stands only 452 mm from the ground.

Yet it carries 9.8kWh of storage, an impressive feat.

Here is the rest of the RESU’s datasheet:

[wpdatatable id=13]

As seen above, LG Chem’s high voltage range is larger in size when compared with the low voltage model.

Not mentioned above, however, is that the 400V models have a 95% DoD, where as the low voltage models have a 90% DoD.

All in all, the RESU is technically a solid battery and, based on the warranty, should last you a full 10 years.


A Better Warranty for the Lifecycle

Like the Tesla Powerwall, the LG Chem RESU is under warranty for 10 years.

The LG Chem is also covered by warranty for 3,180 cycles and the amount that is repaid upon failure is dependent on how many years it has been running.

For example, in the first two years, a homeowner can expect a 100% cashback warranty upon the failure of their RESU.

However, once the unit is three years old, LG will only replace 72% of the total purchase value.

Over the ten year period the replacement value looks like this:

[wpdatatable id=14]


The LG Chem is a great battery, that’s it. Don’t expect any flashy software or inbuilt inverter. But if you’re looking for a tool that gets the job done, then look no further.

The LG Chem is a DC coupled Li-Ion battery with a buffet of models to choose from, no matter what your home needs in a battery.

Choose between a high voltage or low voltage model depending on your size preference and budget.

Or choose between a 3.3kWh, 6.5kwh, 7kwh and 9.8kWh storage capacity, depending on how much energy your home is using during the night.

Whatever you choose, you will be pleased with how much more solar energy you get to keep in the home!

Next Step

If you want to see how much solar or battery storage could save you over the next 5 years, then take our solar saving calculator quiz below!

Or talk to an Instyle Solar expert about the best solutions for home energy storage or PV-panels.

Otherwise, head back to the solar blog to find even more great educational content.

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