LG Chem’s Residential Energy Storage Unit (RESU) batteries are part of the new technology of solar batteries that present power storage and backup power for properties. They are designed to pair with a residence solar system and join straight to a storage-ready solar inverter for charging and discharging.

The LG RESU battery can be put in in both on or off-grid photovoltaic techniques, and is one of the main Tesla Powerwall alternate options. Let’s dig into more about how the LG Battery works and whether or not it’s proper for you.

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How the LG Chem battery works

In a residence solar-plus-storage system, one or more LG Chem RESU batteries are linked straight to your solar inverter, charging them utilizing direct present (DC) power produced by your solar panels. 

The batteries can maintain between 7 and 9.8 kilowatt-hours (kWh) of electrical energy, relying on the dimension you select. That corresponds to mannequin # RESU7H for the 7-kWh battery and mannequin # RESU10H for the 9.8-kWh model.

Throughout the day, when the solar is excessive in the sky, residence solar techniques produce more electrical energy than the home wants. That saved solar power can be used to power the residence later in the night, after the solar units. It’s additionally potential to set the battery to retain a specific amount of its saved power in case of a power failure.

Whether or not you select the 7 or 10-kWh dimension, RESU batteries are divided into two sub-models that are each constructed to talk with particular manufacturers of solar inverters. 

Mannequin numbers with “-C” at the finish work with SMA Sunny Boy Storage inverters, and these with “-R” work with Fronius, Huawei, and SolarEdge StorEdge inverters. Your installer will choose the correct mannequin to work with your solar system.

Particulars about LG Chem RESU batteries

LG Chem RESU batteries particulars
Mannequin identify LG Chem RESU7H-R LG Chem RESU7H-C LG Chem RESU10H-R LG Chem RESU10H-C
Whole power capability (kWh) 7.0 7.0 9.8 9.8
Usable power (kWh) 6.6 6.6 9.3 9.3
Energy score (steady) 3.5 kW 3.5 kW 5.0 kW 5.0 kW
Peak power (10 sec) 5.0 kW 5.0 kW 7.0 kW 7.0 kW
Voltage vary (V) 350~450 430~550 350~450 430~550
Spherical journey effectivity 94.5% 94.5% 94.5% 94.5%
Dimensions (W X H X D, inches) 29.3 x 27.2 x 8.1 29.3 x 35.7 x 8.1 29.3 x 35.7 x 8.1 29.3 x 35.7 x 8.1
Approximate weight (lb) 168 192 214 220

Every mannequin has a guarantee of 60% capability after 10 years or 22.4 MWh.

Extra info and knowledge sheets accessible on the LG Energy Storage System site.

Benefits that set LG batteries aside

Like all residence solar batteries, LG Chem RESU batteries are designed to cost from your solar panels and preserve electrical energy accessible for you at evening and in the case of a power outage. 

However the LG battery has some particular benefits over other varieties of batteries.

LG Chem battery advantages

  • Battery backup for use at evening or throughout a power outage
  • Extra compact dimension and lighter weight than opponents like the sonnen eco
  • DC-coupled for better effectivity and integration with solar storage inverters
  • Simple set up and servicing
  • Can be discharged up to 95% of capability (depth of discharge)
  • 94.5% round-trip effectivity outputs 9.45 kWh for each 10 kWh saved (exceeds competitor efficiency)
  • 10-year guarantee
  • Accessible from many solar firms, together with Sunrun

As a result of they use lithium ion batteries, LG battery packs can be discharged to virtually their full capability each day, and final a long time. On common, LG Chem battery techniques can cost and discharge each day for 10 years and nonetheless retain 60% of their authentic capability.

As well as, LG’s superior manufacturing course of produces batteries that are more compact, more environment friendly, and lighter than many alternate options. And the LG Chem RESU batteries are all DC-coupled, that means they cost straight from solar panels, which is more environment friendly than charging from power that has been transformed to AC earlier than reaching the battery.

Lastly, the LG Chem RESU battery is accessible from many completely different solar installers throughout the nation, together with Sunrun, which sells the LG batteries for a low month-to-month fee as a managed power storage resolution they call “Brightbox.”

The LG Chem battery guarantee

LG Chem’s guarantee guarantees that its RESU batteries will preserve at least 60% of their preliminary rated power storage capability after 10 years OR earlier than the battery has been used to present 22.4 megawatt-hours (MWh) of electrical energy.

That distinction is vital, as a result of if you’re absolutely charging and discharging the battery day by day, you’ll run by way of that quantity of MWh sooner than 10 years. To unfold 22.4 MWh over 10 years, you’d have to guarantee the batteries discharge an common of solely 6.14 kilowatt-hours (kWh) per day, which is 62% of their capability.

This could be nice for most people, as day by day biking of the battery isn’t essentially the plan. Speak to a licensed installer to find out whether or not you ought to count on to use more than 6.14 kWh of battery storage per day.

The guarantee doesn’t embody specific protections from defects in supplies and gear, which is a pretty main oversight. The guarantee implies that LG will restore or change the battery if it’s discovered to be faulty, but that doesn’t meet a very excessive customary. 

It would be higher if LG explicitly assured safety for faults in supplies and workmanship for 10 years.

Price and incentives

Like many other solar system parts, the value of the LG RESU batteries adjustments over time, and relies upon on the place you set up it and who does the work. 

As of October 2020, it prices between $5,000 and $7,000 to purchase a RESU10H battery, earlier than set up prices. If you embody set up prices from a solar installer, a RESU 10H may cost a little between $7,000-$9,000.

That’s not low cost. Fortunately, there are solar battery incentives that can assist convey down the prices. 

As a result of the LG Chem batteries cost solely from solar panels, they qualify for the federal solar tax credit score, bringing your whole price to buy the battery down to one thing like $5,000 – $6,500 after the first yr. 

Some states and utility firms additionally supply solar battery incentives. The preferred is the Self- Era Incentive Program (SGIP) in California. 

Is the LG Chem RESU battery price it?

Whether or not battery storage is price it to you relies upon on the value you put on peace of thoughts. 

If you completely can not bear the thought of struggling by way of a blackout in the darkish, then the LG battery is an glorious selection. And, with Californians now seeing “deliberate outages” of more than a day or two on a common foundation, it would possibly show its price in quick order.

The one way the LG battery turns into financially price it is if you use it to keep away from time-of-use or demand fees. In that case, you’d have to be saving over $.50/kWh on each kWh of storage in order to make it price it over the 10-year lifespan of the battery.

No place on earth has a distinction of $.50 between its on- and off-peak electrical charges, so the price of the LG battery will principally by no means be repaid.

Nevertheless, if you look at this more like a balancing act, between the “peace of thoughts” advantages and the tangible monetary advantages, it would possibly begin to look higher. Particularly if you reside in California.

How a lot can you save by going solar?

Key takeaways

  • The LG Chem RESU battery is one of the hottest residence batteries accessible.
  • One LG RESU battery can maintain between 7 and 10 kilowatt-hours, primarily based on the mannequin (sufficient for about a third of your residence’s day by day wants).
  • If put in alongside a solar set up, the battery qualifies for the federal solar tax credit score, and some state incentives additionally exist.

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