How Solar Panels Work: A Step-by-Step Guide

Solar energy describes the radiation emitted by the sun, which is harnessed using a range of evolving technologies, including the photovoltaic solar panels used by Sun Solar Pros. The sun theoretically sends enough energy to power countless homes and businesses, and the energy is clean and renewable. That is why many have turned to solar as a means of combatting climate change.

Photovoltaic solar panels are made up of a semiconductive material, such as polycrystalline or monocrystalline silicon. They operate on the principle of the photovoltaic effect. When sunlight strikes the cells, it energizes the electrons present in the semiconductor material. This process creates an electric field across the cells, causing electricity to flow. The greater the intensity of the sunlight, the greater the flow of electricity. This is why solar panels must be placed and configured in optimal positions to best capture the available sunlight on a given property. In many cases, solar panels will be placed on roofs, though they can in some circumstances be placed on the ground or mounted as a carport.

Inverters play a crucial role in the utilization of solar energy within homes and businesses. They function to convert the direct current (DC) produced by solar panels into alternating current (AC), which is the standard used by all commercial appliances. In other words, without an inverter, you would have a wealth of solar energy but be unable to use any of it. An inverter accomplishes the conversion through a process known as switching. By rapidly flipping the DC electricity back and forth, the inverter causes the current to change direction, “or alternate.” The resulting AC electricity is then ready to be used by everything from kitchen appliances to industrial machinery. It is important to note that the inverter's efficiency in this conversion process significantly impacts the amount of usable power generated from solar energy systems.

Electrical panels, also known as circuit breakers or breaker boxes, play a pivotal role in the distribution of solar electricity within a residential or commercial building. Once the inverter has converted the direct current (DC) into alternating current (AC), the electrical panel steps in as the heart of the electrical system, directing this electricity to different circuits within the building. Each circuit is protected by a breaker that trips or switches off in case of an overload, preventing potential electrical fires.Electrical panels also play a key role in monitoring and measuring energy consumption within a building. Inside the panel, each circuit is fitted with a meter that records the amount of electricity it distributes. This data can provide valuable insights into your energy usage habits, highlighting areas where you could potentially reduce consumption and save even more on energy costs.

In the case of a solar-powered system, any excess electricity generated that is not used immediately can be sent back to the local grid through the electrical panel. This process is known as net metering. It involves a special meter that can spin both ways, recording the electricity your home draws from and supplies to the grid.

• This allows solar customers to receive credits for excess electricity they generate and feed back into the grid. These credits can offset future electricity bills when solar production is lower than consumption.
• Conversely, should your solar system be unable to supply sufficient power at night or on an especially cloudy day, you will be able to instead draw power from the grid, which is then credited against the electricity you have already diverted to it over time.

At the end of each billing cycle, the energy utility company calculates the “net” energy used by subtracting the energy you supplied to the grid from the energy you consumed. If you supplied more energy than you consumed, you might receive credit or a financial return, though California’s newer “3.0” net metering rules incentivize you to rely on a battery storage solution versus drawing power from the local grid.

Solar battery systems play an increasingly crucial role in harnessing and optimizing the use of solar energy, particularly in California, where net metering rules make it more beneficial to draw on your own stored power versus getting grid power. These systems work by storing excess energy produced by the solar panels during peak sunlight hours for use during nighttime, cloudy days, or during power outages, providing a continuous and reliable power supply without having to draw from the local grid.

The process starts when the solar panels generate direct current (DC) electricity, which then gets converted into alternating current (AC) by the inverter. If the energy produced exceeds the demand in the building, rather than sending this excess power back to the grid (as in net metering), it gets directed to the solar battery for storage. The inverter changes the AC electricity back to DC to be stored in the battery, as most solar batteries require DC input.
When solar production is low, or during a power outage, the system will utilize stored power in the battery to avoid interruptions to energy supply. The DC electricity in the battery is converted back to AC by the inverter to be used in the building's electrical appliances.

Solar panels installed on rooftops or in open areas capture sunlight and convert it into electricity through photovoltaic cells, which produce direct current (DC) electricity. This electricity is then converted into alternating current (AC) by an inverter and used to power homes or businesses.

NEM is a billing arrangement that allows solar energy system owners to receive credit for the excess electricity they generate and export to the grid. This surplus energy can be used to offset electricity consumption during times when the solar panels aren't producing enough power, such as at night or during cloudy days. Essentially, NEM enables solar users to save money on their electricity bills by leveraging their solar production effectively.

When considering the integration of backup batteries into your solar energy system, it's essential to weigh the benefits and implications of both NEM 2 and NEM 3. Factors such as your energy consumption patterns, budget, and long-term goals should inform your decision-making process. Consulting with reputable solar energy providers and staying informed about evolving policy developments can help you navigate the complexities of solar energy adoption and maximize the benefits for your home or business.

While both NEM 2 and NEM 3 aim to incentivize solar adoption and promote renewable energy generation, there are notable distinctions between the two, particularly concerning backup battery integration.

NEM 2

• Battery Integration: Under NEM 2, homeowners and businesses can install backup batteries alongside their solar energy systems. These batteries allow users to store excess solar energy generated during the day for later use, such as during the evening or in case of grid outages.
• Billing Structure: With NEM 2, surplus energy exported to the grid is credited at the retail electricity rate, providing financial incentives for solar users to maximize their self-consumption and minimize reliance on the grid.
• System Size Limitation: NEM 2 imposes a limit on the size of eligible solar energy systems, typically up to 1 megawatt (MW), to qualify for net metering benefits.

NEM 3

• Enhanced Battery Benefits: In contrast to NEM 2, NEM 3 offers expanded benefits for backup battery integration. This includes increased flexibility in storing and utilizing solar energy, as well as potentially accessing additional incentives or credits for grid support services, such as demand response or peak shaving.
• Updated Billing Structure: NEM 3 introduces revisions to the billing structure, which may impact the way solar users are credited for their exported energy. While specific details may vary, NEM 3 aims to align incentives with evolving grid dynamics and promote grid stability and resilience.
• Future-proofing Solar Investments: By embracing NEM 3 and its provisions for advanced energy storage technologies, solar adopters can future-proof their investments and contribute to a more sustainable and resilient energy infrastructure.