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A Guide to Solar Plus Storage

Updated: Jun 13

solar plus storage

Solar panels and battery energy storage go together like peanut butter and jelly or wine and cheese. Solar plus storage technology enables the solar power industry to grow more quickly and provides an increasingly vital role in the clean energy mix. Offering solar storage options to your customers helps you to grow your business and increase your revenue.

Solar energy is an intermittent power supply because the sun doesn’t shine 24/7. Between cloudy weather and nighttime hours, the sun doesn’t shine quite a bit of the time. Yet, our homes and businesses still rely on electricity to run. Solar plus storage capabilities allow solar photovoltaic systems to store excess power using solar batteries.

What Is Solar Plus Storage?

Solar plus battery storage refers to a combined system that incorporates both solar panels for electricity generation and energy storage solutions, typically in the form of batteries. The integration of solar panels and energy storage enables a more comprehensive and flexible approach to managing and utilizing solar energy.

By design, most solar power systems without batteries do not supply power when the grid is down. Having a solar battery bank allows the solar system to operate independently of the power grid.

NMC Vs. LFP Solar Plus Battery Storage

The two most widespread lithium batteries used with solar energy systems are lithium nickel manganese cobalt oxide (NMC) and lithium iron phosphate (LFP). Numerous manufacturers offer lithium solar batteries, including Tesla, LG Chem, SimpliPhi, Blue Planet, and Sonnen. Lead-acid batteries are decreasing in popularity in the solar industry because they require more maintenance and have a shorter lifespan.

Comparing NMC and LFP Solar Plus Storage


NMC Batteries

LFP Batteries

Battery Composition

Nickel Manganese Cobalt (NMC)

Lithium Iron Phosphate (LFP)

Energy Density

Higher energy density, potentially more compact

Slightly lower energy density, larger in size

Cycle Life

Moderate cycle life (typically 500-1000 cycles)

Long cycle life (often exceeds 2000 cycles)

Solar Battery Safety

Generally good safety record, but may be more prone to thermal runaway compared to LFP

High safety profile, less prone to thermal runaway


Often a lower cost than LFP solar batteries

Initially higher upfront cost, but lower total cost of ownership over the lifespan

Temperature Sensitivity

May exhibit higher sensitivity to high temperatures

Less temperature-sensitive, performs well in a range of conditions

Battery Charging Efficiency

Generally good charging efficiency

High charging efficiency

Use Applications

Widely used in electric vehicles and grid storage

Commonly used in stationary energy storage systems, power banks, and some electric vehicles

Types Of Solar Plus Storage

There are two main types of solar power systems with battery storage, depending on their setup with the utility company.

Grid-Tied Solar Systems

These solar power systems with battery banks can either feed surplus power to the grid or charge the batteries. Thus, at night, these customers can either get power from the batteries or the electric grid. For this reason, such systems are referred to as hybrid solar systems. Most residential and commercial solar systems with storage are grid-tied systems.

Off-Grid PV Systems

Off-grid solar energy systems are not connected to the electric grid. Therefore, they need adequate energy production and storage capabilities to meet the power needs of the home or business or else a backup generator. Typically, these help power rural homes or businesses where it’s too costly to extend the power grid.

Off-grid solar systems are sized differently than grid-tied systems due to the need to meet all energy demands independently. Off-grid systems must be designed with larger solar arrays and battery storage capacities to ensure sufficient energy production and storage for periods without sunlight, meeting the entire energy demand without relying on a grid connection.

Why Is Solar Battery Storage So Popular?

As solar battery technology advances and prices fall, solar plus storage is increasingly appealing to a broader audience. What might have been unaffordable to many households just 5 or 10 years ago is now feasible. As battery capabilities grow, they are becoming more attractive than a backup generator in many markets. In states without net metering laws, batteries enable homeowners to store energy instead of receiving credits on their electric bills.

Also, some recent high-profile power outages have concerned home and business owners about the power grid’s reliability. On the West Coast, wildfires have led to blackouts due to public safety power shutoffs. The 2021 Texas power crisis left 4.5 million households without power at its peak and many without safe drinking water. Even the pandemic has prompted some households to become more concerned with self-sufficiency and resiliency. Understanding your customers’ concerns and needs makes it easier to design and sell a solar plus storage system that will pique their interest.

solar plus stoarge

Benefits Of Solar Plus Storage

Adding energy storage capabilities to solar panel systems will benefit your customers in several ways. Keep in mind that some benefits vary by location due to programs offered by the local utility company and state incentives.

Energy Security

Having dolst batteries enables the home or business to be resilient in the face of power outages and even prevent costly property damage in some cases. During blackouts, these customers can rely on batteries to power critical power loads. For businesses, batteries enable them to reduce the downtime and productivity losses from blackouts. As an installer, it’s helpful to give customers guidance on selecting critical loads to maximize their value from the solar panel system while staying within the design confines of the system.

Time-Of-Use Rates & Energy Bill Savings

Some utility companies offer time-of-use rates depending on the time of day, day of the week and season. These customers then pay a higher rate to consume power during times of peak demand. This means that a kilowatt-hour of energy doesn’t cost the same amount throughout the day or the year. In utility districts with time-of-use pricing, your customers can pull power from the batteries during times when electricity rates are highest, resulting in utility savings.

Energy Storage In Areas Without Net Metering

In states like Hawaii, without net metering programs, batteries allow solar system owners to store excess power because they will not get compensated by the utility company at the retail rate for surplus electricity. Having a solar battery enables these system owners to save energy for later use.

Solar Plus Storage Incentives And Programs

It’s relatively costly to add energy storage capabilities to a solar array. Thankfully, government incentives can reduce the total system cost, boosting the project’s return on investment. In many cases, these programs make a project financially viable when it might not have been otherwise.

Self-Generation Incentive Program (SGIP)

The new California Public Utility Commission (CPUC) program is available for both residential and non-residential projects and is intended to boost emergency preparedness with backup power. This battery rebate program can dramatically reduce the cost of installing solar power storage. The SGIP has two categories that determine the dollar value of the eligible rebate. In some cases, the CPUC rebate covers nearly 100% of the cost of the battery bank.

When installing battery storage systems in California, it’s critical to determine if your potential customer qualifies for this solar plus storage incentive. Meeting the program requirements can significantly boost the chance of making a sale.

Federal Investment Tax Credit for Solar Plus Storage

The federal solar tax credit, also known as the investment tax credit (ITC), applies to solar systems with batteries. The tax credit is a percentage of the total system cost. Thus, solar systems with batteries can qualify for a larger tax credit because the additional cost of the batteries increases the total system cost. The tax credit is currently in effect at 30% through the end of 2032 and then will decrease to 26% for systems installed in 2033.

State-Level Solar Battery Incentive Programs

Some states, especially in the Northeast, have programs that reduce the net cost of installing battery storage systems. In some cases, installers must be approved contractors for their customers to qualify for an incentive.

  • The Maryland Energy Storage Income Tax Credit enables residential and commercial taxpayers to benefit from installing energy storage capacity with an income tax credit.

  • The Solar Massachusetts Renewable Target (SMART) Program has an adder for solar systems with battery storage. Eligible residential customers can earn payments of hundreds of dollars a year or thousands of dollars over 10 years. Commercial customers can earn payments for 20 years. The value of the incentive depends on the size of the solar system and the battery’s energy capacity.

  • The Oregon Solar Plus Storage Rebate Program provides up to $2,500 in rebates for installing a solar battery through the Oregon Department of Energy.

Solar Battery Warranties

Most solar battery manufacturers offer product warranties. An end-of-warranty capacity rating guarantees that the battery bank will hold a certain percentage of the original capacity for the warranty period. A throughput warranty relates to the total energy the battery is expected to deliver throughout its life and is measured in megawatt-hours (MWh) for residential projects. The throughput warranty is intact until the solar storage system has provided that amount of electricity.

Is Solar Plus Storage Worth It?

Lower equipment costs and increased storage capabilities have made solar batteries more appealing than ever before and one of the fastest-growing segments in the solar PV industry. When available, time-of-use pricing from the utility and government incentives boost the returns customers will enjoy. As the solar battery storage market expands, solar installers have an exceptional opportunity to upsell customers by adding storage.

solar plus storage

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