Solar Battery

NO SUN NO PROBLEM. 
Power up with solar battery generation. 

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Battery Generation 
 
The LG RESU 10H packs 10kWhr of lithium ion cells rated to 6000 cycles or more and is the first entry in LG Chem's new high voltage range. These batteries are designed to be compatible with the SolarEdge StoreEdge Inverters. The LG Chem is capable of putting out 5kW of peak power or 3.5kW continuously. The battery has 9.8 kWh of usable capacity with a round trip efficiency of greater than 90%. 
A LG solar battery can store surplus energy generated from rooftop solar panels for use when needed. When the sun has set, energy demand is high, or there is a black-out, you can use the energy stored in your LG solar battery to meet your energy needs at no extra cost. Unlike a grid-tied solar system which automatically switches off, a battery storage system allows you to keep generating and consuming energy when the grid goes down. In addition, a LG solar battery helps you pursue the goal of energy self-consumption and ultimately energy-independence.
Compact Size & Easy Installation

The compact and lightweight nature of the RESU is world-class. It is designed to allow easy wall-mounted or floor-standing installation for both indoor and outdoor applications. The inverter connections have also been simplified, reducing installation time and costs.
Compatible with our SolarEdge Solar PV Optimizer Kits
The best solution for interfacing a LG RESU battery with solar panels and the utility grid. are our solar kits with SolarEdge StorEdge compatible systems are a single inverter for solar panel grid-tie applications that also manages DC battery backup storage power. It includes the hardware required to provide automatic backup power to backed-up loads in case of grid interruption. The SolarEdge also includes all of the interfaces needed for DC battery connection.
Electricity Bill Saving

• Charge during off-peak times.
• Discharge during peak times.

Self-consumption

• Store solar energy generated from your solar panels for future use.

Emergency Power Backup

• Discharge during a blackout, functions as back-up power
LG Chem RESU Warranty
10 years from the date of purchase.

Warranty of Performance

LGC warrants that the battery retains at least 80% of Nominal Energy for 7 years after the date of invoice and at least 60% of Nominal Energy for 10 years after under proper conditions of the use during the Term of Performance Warranty. Please contact us for details.

RESU 10 Certifications
LG Chem places the highest priority on safety and utilizes the same technology for its ESS products that has a proven safety record in its automotive battery. All products are fully certified in relevant global standards.

Safety
Cell: UL1642
Battery Pack: UL1973 / CE / RCM / TUV(IEC 62619)
Emissions: FCC
Hazardous Material Classification: Class 9
Transportation: UN38.3
Ingress Rating: IP55

Creating Energy Independence With Solar Panels & Storage Battery Systems In The Home

This home in Nova Scotia has PV panels that supply most of the energy required for the home.
This home in Nova Scotia has PV panels that supply most of the energy required for the home.PHOTO COURTESY OF ADAM CORNICK, ACORN ART & PHOTOGRAPHY FOR DOWNSIZE: LIVING LARGE IN A SMALL HOUSE
When designing a house, one of the most important issues is energy efficiency. That means there needs to be the right amount of insulation in the foundation, walls and roof, energy efficient windows, and well placed on the periphery of the house. The house also should be placed on the property for optimal solar orientation. With these factors covered, the house will require minimal energy for heating and cooling.  

A perfect solution for efficiently providing the energy for electricity is to install photovoltaic (PV) solar panels on the roof or next to the house. The house can get energy from the grid when there is no sun or inclement weather and feed energy back to the grid where this is allowed. 

A diagram showing how a solar panel/battery system works.
A diagram showing how a solar panel/battery system works.PHOTO COURTESY OF SOLAREDGE
Some houses are totally off the grid because connecting to the grid would be too expensive or unavailable in that area. These houses require photo voltaic (PV) panels to provide energy and batteries to store the energy for periods when there is no solar energy and/or inclement weather. When a household stores solar energy produced on site and uses that energy when solar production is less than than the energy requirements in the house - it is called “self consumption.”

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The house may also be connected to the grid and return excess energy to the grid when the battery is full or during peak periods of the day when the grid is overloaded.

I interviewed Lior Handelsman, VP of Marketing & Product Strategy and Founder of SolarEdge, a global leader in smart energy technology to get very up-to-date information on solar energy. The interview with Handelsman follows:

1. How have the batteries improved in the last several years?

The past decade has seen impressive improvements in battery technology, in areas such as performance, lifespan, charging and discharging rates, efficiencies, energy densities, and more. This all means that batteries provide consumers with more value. There are a number of drivers influencing technology improvements, such as the large demand from the mobile market this past decade and the expected demand from the electric vehicles (EV) and solar market in the coming one. We will likely see increasingly specialized batteries for the different markets, such as faster discharge rates for the automotive market so that EVs can accelerate more quickly.

The interior mechanisms for a battery backup system.
The interior mechanisms for a battery backup system.PHOTO COURTESY OF SOLAREDGE
2. Have they come down in price? Is that due to new technology.

Over the past decade, Lithium-Ion batteries prices have globally declined nearly 90% in manufacturing prices according to Bloomberg NEF. This is in all sectors, not just in photo voltaic (PV) or residential PV panels. The same report by Bloomberg NEF forecasts another 50% drop in Lithium-Ion battery prices by 2023. This decline is due to a variety of reasons, such as improved technology, advancements in manufacturing, and economies of scale. For instance, the burgeoning EV market is one of the sectors driving the growth of batteries. Fortunately, the solar energy storage market is benefitting from this, making it more cost-effective for consumers and businesses to generate and store their own solar energy.

3. Can you give me a simple explanation for how inverters works?

At their most basic level, solar inverters are responsible for converting solar energy into energy that can be used in the home and the grid. However, inverters are becoming much more than that; they are turning into smart energy managers. They still manage solar energy, but they can now also manage energy storage in a battery, how energy is consumed in the home, EV charging, and can also support grid stabilization. They are becoming both the brain for smart energy management in the home and the point of contact to manage a smart grid.

4. Is there a simple explanation for a virtual power plant?

The energy grid is beginning to transition from one based on centralized, polluting power stations to an interconnected, distributed network of solar energy and battery systems. A virtual power plant can manage, in real time, all of these distributed sites, in a neighborhood, as one large, virtual power station. So how does this work in reality? When a network operator sees that there will be an energy demand peak at a certain time and day, the virtual power plants (VPP) can be used to send a signal to all the inverters to start storing energy in the distributed network of batteries. Then when the demand peak is reached, these inverters discharge the energy from the batteries into the grid in order to supply enough energy.

5. What are the factors that determine how large the system should be? What are the subsidies offered in the United States?

The main factors in designing a solar-plus-storage energy system are energy needs, roof size, and subsidies. The energy patterns are important for understanding how large of a solar energy system is needed to offset or minimize energy bills. The roof size will determine how much power can be put on the roof and how much energy can be produced. And the type of subsidies can also impact system size and the type of system. For instance, there are some subsidies that limit how much solar energy can be fed into the grid, so this will impact system size. In a market that focuses on feeding as much energy into the grid as possible at a high price point, then the solar energy system size can be maximized. But there are markets that don’t allow any solar energy feed-in to the grid. It is these types of markets that batteries are the most useful, since batteries allow consumers to produce solar energy during the day, and then store that energy for use in the evening and mornings. The size and amount of batteries are determined based on household energy patterns. There is an investment tax credit (ITC) of 26% for solar and storage installations throughout the US. However, this is only applicable to batteries if, and only if, the battery is charged exclusively from solar. Additional incentives for solar energy varies widely based on the state. However, in general, the US market offers a solar subsidy called net metering. This is when the cost of the electric energy consumed from the grid is offset by the electric energy generated by the renewable source. There are some larger and more advanced solar markets that offer time of use. This is when the price of electricity varies based on the time of day and week it is used or produced. An example of this would be California. While Hawaii has the highest penetration of solar energy, it now has zero export, in which solar energy systems with storage are not at all allowed to export energy to the grid at any time. Some other types of battery-specific subsidies include California Public Utility Commission’s Self-Generation Incentive Program (SGIP) that offers a direct subsidy from the State for batteries. There are of course some specific requirements to quality for this program. Another example is the Solar Massachusetts Renewable Target (SMART) Program. This program offers a generous incentive for batteries as part of its overall solar program. Incentives to install batteries are also being provided by utility companies, such as National Grid’s Connected Solutions program in Massachusetts and Rhode Island, in which participants receive financial incentives for battery access.

6. Do you have any idea what percentage of homes today have PV panels? Batteries? - compared to 5 or 10 years ago?

According to PEW research, only 6% of homeowners already have solar panels on their homes. So, while the residential PV market in North America is at its early stages, it is quickly growing. Wood Mackenzie data put the PV residential market in 2013 at only 799 megawatts (MW), but by the end of 2018 it was already reaching 2,422 MW, showing more than 200% growth. The solar battery market seems to be following the same path of the PV market, but is in its early stages. According to Wood Mackenzie, in 2015 there was less than 10 MW of solar storage deployed in the US residential market, and by mid-2019, this ballooned to nearly 70 MW. In fact, the increased demand in the second quarter of 2019, which was 35 MW of new residential storage, represented a new benchmark in terms of quantity and was nearly a 33% increase over the previous record. Also predicted by Wood Mackenzie is that 20% of residential solar installed in 2020 will be paired with storage. A main driver of the demand for solar-plus-storage installations is the power “shutoffs” (Power shutoffs are power outages, but unlike all power outages, power shutoffs are intentional. Some power outages can be unintentional, i.e. caused from a storm. that have occurred during the past few months in California.)

7. What is driving the sale of PV/ battery sales?

There are two major trends driving the sale of solar energy and battery systems: Grid parity and grid independence. Grid parity means that the cost of producing solar energy is lower than the cost of buying energy from the grid. There are many states in the U.S. that have already reached grid parity. So, financially, it makes sense for people to generate and consume their own solar energy. Grid independence is when consumers want to use the energy that they themselves produced. This can happen in areas where the grid is unstable and suffers from frequent black outs.




                                  (Solar Inverters)

Inverters play a crucial role in any solar energy system and are often considered to be the brains of a project, whether it’s a 2-kW residential system or a 5-MW utility power plant. An inverter’s basic function is to “invert” the direct current (DC) output into alternating current (AC). AC is the standard used by all commercial appliances, which is why many view inverters as the “gateway” between the photovoltaic (PV) system and the energy off-taker.
Inverter technologies have advanced significantly, such that in addition to converting DC to AC, they provide a number of other capabilities and services to ensure that the inverter can operate at an optimal performance level, such as data monitoring, advanced utility controls, applications and system design engineering. Inverter manufacturers also provide post-installation services that are integral to maintaining energy production and a high level of performance for the project, including preventative maintenance, O&M services and a quick mean time to repair (MTTR).
As the price of modules fall, inverters and additional system components have become a focus in price reduction for EPCs looking for a new competitive edge. As a result, inverter manufacturers are continually trying to drive down the cost curve of products.
Some companies have been able to do that successfully with modifications to manufacturing strategies and building additional manufacturing facilities within emerging solar markets. Additionally, companies have taken the core concept of “design for manufacturability”—meaning they design a product with ease of manufacturing in mind—to design inverter products that are quicker and cheaper to produce, without sacrificing performance. Inverter manufacturers have also been able to achieve lower-cost success through well-maintained partnerships with vendors.
The continued challenge of providing higher and higher value at lower cost is something the industry must work to overcome.
Grid integration and inverters
High PV penetration and the impact it will have on our aging electric grid is another challenge the entire solar industry faces. The challenge itself isn’t specific to inverters, but the solution may be entirely inverter-driven. Because inverters serve as a gateway to the system, advanced utility controls, such as low-voltage ride through, can help mitigate the issues that stem from higher PV penetration on the grid, such as predictability of output and distributed generation. These functions help ease the transition as more solar is built, without the need for major and expensive infrastructure upgrades. Utilities are keen to support the development and use of inverters with the most proven functionalities when it comes to grid interconnection.
Design flexibility
Given the growth in distributed generation projects along with continued development of utility-scale projects, solar project developers are seeking inverter manufacturers that can provide a robust suite of commercial products and technology topologies. A flexible inverter manufacturer can offer a centralized and decentralized inverter design, referring to an architecture that uses multiple inverters throughout a project to achieve the lowest levelized cost of energy (LCOE) possible. Although there’s still growing demand for a common system architecture using a centralized inverter, designing in three-phase string inverters for a decentralized PV system design is gaining in popularity. This is particularly true in commercial applications where space is at a premium or in an odd form.
Inverters have evolved from much more than simply inverting the electrical currents of a solar energy system. Inverters must continue to innovate and bring down cost, while maintaining key attributes for a solar energy system (reliability, efficiency and features such as data monitoring), in order to drive more PV penetration.
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