LG has long been a household name for electronics and has two main offerings when it comes to residential battery storage that appear to be coming out of two separate divisions of the company. Contact online >>
LG has long been a household name for electronics and has two main offerings when it comes to residential battery storage that appear to be coming out of two separate divisions of the company.
In this article, we’ll explore both of LG’s solar battery offerings, beginning with a quick recap of how LG got into the residential energy storage business.
LG is one of the leading companies in the home battery industry. While most homeowners are familiar with LG''s electronics and home appliances, fewer are aware of the industry-leading home battery storage products that LG offers.
LG Energy Solution is a subsidiary of parent company LG Chem, which has extensive experience manufacturing lithium-ion batteries. LG Chem supplies battery packs for some of the most popular electric vehicles in the world, including the Chevy Bolt.
Launched in 2021, the LG Chem RESU10H and RESU16H Prime were the company''s best DC-coupled batteries to date and offered compelling alternatives to the Tesla Powerwall.
LG’s home batteries provide all the standard advantages of solar batteries, including backup protection against grid outages, time-of-use load-shifting, and greater energy independence.
The RESU10H Prime, RESU16H Prime, and Home 8 are similar in several ways. However, there are some key differences that should be considered when you’re shopping for home battery storage.
Unlike the Tesla Powerwall, the LG Home 8, and other popular battery options, the RESU10H Prime and RESU16H Prime are DC-coupled batteries. One of the biggest advantages of a DC battery is that it has better round-trip efficiency than an AC battery.
The difference is due to the number of times electricity is inverted from DC to AC (and vice versa) before it is used to power the home. Each time the current is inverted, a little bit of energy is lost to heat, which reduces the round-trip efficiency.
While DC batteries are much more efficient, they can be significantly more difficult to add to existing solar systems. So, if you already have solar panels, the AC-coupled Home 8 is likely the more cost-effective LG battery option, even if it isn’t as efficient as a DC battery.
The best of these inverters on the market today is the SolarEdge StorEdge, which provides a single-inverter (DC-coupled) solution for both a solar PV system and a home battery, reducing energy loss and overall system costs.
As a result, DC batteries like the LG RESU10/16 Prime are more difficult to retrofit to existing solar systems, as doing so requires replacing the existing solar inverter. If the existing system uses microinverters, then it won''t be possible at all — in which case the Home 8 is an obvious alternative.
Being a DC battery also means that the LG RESU10/16 Prime’s output cannot stack, so the system''s output is limited to 24 amp circuits and below, even with multiple batteries.
Therefore, while buying two batteries will increase the system''s backup duration in an outage, it will not increase the amperage of the circuits that can be backed up.
On the other hand, the LG ESS Home 8 is stackable and homeowners can combine up to four units to increase their power output and gain up to 57.6 kWh of usable energy.
So, if you have larger loads to power in backup mode, like an air conditoner, stacking two or three Home 8’s is likely a better option than the RESU 10/16 Prime.
The LG Home 8 is has a forced air cooling system, which is more effective than passive cooling and less effective than liquid-cooling. This likely won’t be a make-or-break feature for most homeowners, but it’s worth considering if you live in extremely hot climates.
Finally, we come to LG’s biggest competitive advantage — price. Battery prices vary based on size, technology, and scope of project, but, in general, LG batteries are very competitively priced.
The LG Chem RESU 10H typically runs about $9,000-$11,000, fully installed and before the 30% federal tax credit for battery storage. That includes all of the ancillary components needed to make the battery function — see our article on solar battery pricing for more information about the factors that contribute to battery pricing.
Given that the Tesla Powerwall typically runs about $12,000-$14,000, the LG Chem can undercut Tesla''s pricing by 20-30%. While it does have less capacity (9.3kWh vs. 13.5kWh), it will still meet most homeowners'' backup and load-shifting needs just fine, and do so at significantly lower cost than the Tesla Powerwall.
LG Home 8’s typically cost around $10,000 before installation and incentives. After installation and the 30% federal tax credit, we estimate the average total project cost to be around $9,750 — or around $680 per kWh of capacity.
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