Energy Storage 101

What’s an energy storage system?

Many solar-energy system owners are looking at ways to connect their system to a battery so they can use that energy at night or in the event of a power outage. Simply put, an energy storage system is a battery/inverter system that is charged by a connected solar system, such as a photovoltaic (PV) one.

Solar panels have one job: They collect sunlight and transform it into electricity. But they can make that energy only when the sun is shining. That’s why the ability to store solar energy for later use is important: It helps to keep the balance between electricity generation and demand.

Lithium-ion batteries are rechargeable because their chemical reactions are reversible, allowing them to absorb power and discharge it later. Lithium-ion batteries can store a lot of energy, and they hold a charge for longer than other kinds of batteries.

How does the energy storage system work?

When you install a solar battery as part of your solar panel system, you can store excess solar electricity instead of sending it back to the grid. If the solar panels produce more electricity than what is being used or needed, the excess energy goes towards charging the battery. Electricity will only go back to the grid when your battery is fully charged, and electricity will only be drawn from the grid when the battery is depleted.

You will need to have an inverter to convert DC energy being produced by your solar panels and store it in a battery as AC power for later use. The higher your battery’s capacity, the larger the solar system it can charge.

Ready to learn about the Coolisys Energy Storage System?

Digital Power’s Parent Company, Coolisys Technologies Corp. Announces New Energy Storage System (ESS) Product Line

New ESS Provides Comprehensive Solution for Home and Small Businesses

MILPITAS, Calif., Oct. 08, 2020 — Digital Power Corporation’s (“DPC”) parent company, Coolisys Technologies Corp. (“Coolisys”), has released the details of its new Energy Storage System (ESS) product line, that the Company believes is well-suited for homes and small commercial buildings. The new ESS solution can be coupled with Photovoltaic (“PV”) solar systems or can be used off-grid, grid-tied or as a string inverter.

Digital Power will be providing service and support for the Coolisys Energy Storage System product line. With over 60 years of expertise in power technologies, Digital Power and Coolisys will provide the ultimate Energy Storage Solution that increase the value of your power.

The new ESS product is comprised of three major elements including a hybrid inverter to support a wide-range of deployment scenarios, a battery pack for energy storage and a data logger featuring a web-based monitoring portal. The Coolisys hybrid inverter supports a load up to 5.5kW off-grid and 7kW grid-tied. The ESS product is designed for a wide range of applications, including off-grid, self-consumption, net-metering, power backup and time-of-use optimization.

The battery pack features an energy storage system with either one cabinet that can store power of up to 12kWh or two cabinets that can store up to 24kWh. The lithium ferrite phosphate battery pack is ideal for extreme conditions including those in rural or isolated locations.

The web-based monitoring portal provides remote access for system maintenance and performance monitoring.

Coolisys and DPC’s President and CEO, Amos Kohn said, “We are pleased to announce the introduction of a new comprehensive Energy Storage System to the Coolisys product portfolio. This new solution is well-positioned to address the rapid expansion of PV solar systems for private homes and small businesses. Our ESS improves the stability and reliability of power from a renewable energy source and during grid interruptions.” Mr. Kohn concluded, “Entering the energy storage market expands the breadth of our product offerings as we continue to build on our strong reputation for delivering high-reliability power solutions designed to serve emerging markets.”

About Digital Power Corporation

Digital Power Corporation, a wholly owned subsidiary of Coolisys Technologies Corp. designs, manufactures and sells high-grade customized and off-the-shelf power system solutions. Its products are used in the most demanding telecom, industrial, medical and military applications where customers require high density, high efficiency and ruggedized power solutions. DPC’s headquarter is located at 1635 South Main Street, Milpitas, CA 95035;

Contacts: or 877-634-0982