A Beginner's Guide to the PV/Energy Storage Industry

Many people hear "photovoltaic" or "energy storage" and immediately think of high-tech industries with steep entry barriers. In reality, it's not that complicated.

This article will guide you from scratch in the simplest, most straightforward way-explaining what photovoltaic power generation is, what energy storage systems are, how they work, and the benefits they bring to both daily life and businesses.

No prior expertise needed. After reading this article, you'll gain a clear, comprehensive understanding of this industry.

Before diving into the industry, grasp two key terms: photovoltaics and energy storage.

1. What is Photovoltaics?

Photovoltaic power generation, simply put, is "using sunlight to generate electricity."

The blue solar panels you often see on rooftops are photovoltaic modules, designed to convert sunlight into electrical energy.

Think of it this way:

Photovoltaics are like installing a "solar generator" on your house-as long as the sun shines, it continuously produces electricity.

The key advantages of photovoltaic power generation are:

No fuel required

Zero pollution emissions

Low operating costs

Relatively simple maintenance

That's why more and more homes, factories, and shopping malls are now installing photovoltaic systems.

2. What is Energy Storage?

The core function of energy storage is to store electricity.

Photovoltaic power generation has a distinct characteristic:

It can only generate electricity during daylight hours when the sun is out. At night or on cloudy days, power generation decreases significantly or even stops entirely.

However, our electricity demand is constant around the clock. This creates a mismatch between "power generation time" and "power consumption time."

The role of energy storage systems is to:

Store excess electricity generated during daylight hours

Then release it during evenings or peak consumption periods

Think of energy storage as a "giant power bank" specifically designed to manage and distribute electricity.

3. Why combine photovoltaics with energy storage?

Using photovoltaics alone means electricity is only available when the sun is shining;

Using energy storage alone means it can only store electricity from the grid.

The "photovoltaics + energy storage" combination enables:

Direct use of photovoltaic power during the day

Storing excess electricity in batteries

Using stored energy at night

This approach delivers more stable, economical, and reliable power supply.

To understand photovoltaics and energy storage, it's crucial to know their respective core components.

(I) Main Components of a Photovoltaic System

A typical photovoltaic system consists of three core parts:

1. Photovoltaic Modules

Commonly known as "solar panels," these convert sunlight into electricity and serve as the system's power generation source.

Common module types currently available on the market include:

Monocrystalline silicon modules

Polycrystalline silicon modules

New high-efficiency modules such as TOPCon and HJT

While efficiency and pricing vary across different modules, their fundamental operating principles remain consistent.

2. Inverter

Photovoltaic modules generate direct current (DC), but our daily appliances run on alternating current (AC).

The inverter's role is to convert DC into AC, making solar power usable for household and industrial equipment.

Think of the inverter as:

The "power conversion hub" within the photovoltaic system.

3. Mounting System

Though seemingly unremarkable, the mounting system is critically important.

Its functions include:

Securing the modules

Adjusting the installation angle

Withstanding wind, rain, and severe weather

A stable and reliable mounting system directly impacts the safety and power generation efficiency of the photovoltaic system.

(II) Core Components of Energy Storage Systems

Energy storage systems are relatively complex, primarily comprising the following elements:

1. Energy Storage Batteries

These form the core of the entire system, functioning as a "power warehouse."

The most prevalent types currently are:

Lithium Iron Phosphate (LFP) Batteries: High safety, long lifespan

Ternary Lithium Batteries: High energy density

Residential and commercial/industrial storage predominantly utilize LFP technology.

2. BMS (Battery Management System)

The BMS acts as the battery's "brain," primarily responsible for:

Monitoring battery status

Ensuring battery safety

Balancing cell voltages

Extending service life

Energy storage batteries cannot operate safely and stably without a BMS.

3. PCS (Power Conversion System)

The PCS functions similarly to an inverter but is more complex:

During charging: Converts AC power to DC power for storage in batteries

During discharge: Converting DC from the battery into AC to power loads

It can be considered the "energy dispatcher" of the storage system.

4. Energy Storage Cabinet or Container

Integrates the battery, BMS, PCS, and other equipment into a complete storage unit, providing protection and integration.

Let's break down the entire process using the simplest logic.

Daytime:

Solar panels generate electricity

Inverters convert power to AC current

Households or factories prioritize using solar power

Excess electricity is stored in batteries

Nighttime:

Solar panels stop generating power

Batteries begin discharging

Powering household or business needs

Automatically switches to grid power when insufficient

The entire process is fully automated, with users experiencing virtually no perceptible switching.

IV. Where Are Solar Power and Energy Storage Applied?

This technology is already widely adopted, with common applications including:

1. Residential Rooftop Solar

Reduces electricity bills

Serves as a backup power source

Excess electricity can be sold back to the grid

Ideal for households with high electricity costs and significant consumption.

2. Commercial and Industrial Settings

Factories, shopping malls, office buildings, and similar venues represent the largest current demand:

Extensive rooftop space

High electricity consumption

Significant electricity costs

Combining PV with storage can substantially reduce operational expenses.

3. Large-scale PV power plants

Concentrated PV plants built in deserts, Gobi regions, etc., paired with large-scale storage, provide stable power to the grid.

4. Off-grid applications

In areas without grid coverage:

Remote regions

Islands

RV and outdoor scenarios

PV + storage directly solves independent power needs.

This is the question on many people's minds.

Residential Scenario

A typical home system includes:

10kW solar panels

20kWh energy storage

Total cost ranges from tens of thousands to over a hundred thousand yuan.

Revenue streams primarily come from:

Electricity bill savings

Revenue from feeding surplus electricity back to the grid

Policy subsidies in certain regions

The payback period typically ranges from 8 to 12 years, making it a long-term, stable income-generating investment.

Commercial and Industrial Scenarios

Commercial and industrial users, with their high electricity consumption and rates, see more pronounced benefits:

Reduced peak-hour electricity costs

Arbitrage through peak-off-peak electricity rate differentials

Enhanced power supply stability

The payback period generally falls between 3 and 6 years, making it a key strategy for many businesses to reduce energy costs and improve efficiency.

VI. Key Factors Affecting Returns

Whether installing solar PV and energy storage is suitable primarily depends on:

Local sunlight conditions

Electricity rates

Peak-off-peak price differentials

Availability of subsidy policies

Electricity consumption levels

These factors directly impact the project's economic viability.

Final Summary

To summarize in a few sentences:

Solar PV is a "power generation system"

Energy storage is an "electricity storage system"

Combining both enables more stable power usage and greater cost savings.

For households, it represents a long-term energy-saving investment;

For businesses, it serves as an effective means to reduce electricity costs.

If you're interested in a PV or energy storage project, we recommend first engaging a professional company for an on-site assessment. Calculations based on actual electricity consumption will yield the most accurate and reliable investment return data.

We hope this introductory guide helps you truly understand this industry!