The global energy crisis is getting worse. Many countries face frequent blackouts, and electricity prices are sky-high. At the same time, people are trying to reduce their environmental footprint.
One solution is to install solar panels at home. This creates a self-sustaining system that’s good for your wallet and the planet. If you’re thinking about installing solar panels with batteries in 2025, here’s how it works, the cost, and why you might need it.
How Solar Panels Work Without Batteries
Solar panels can work without batteries. This is called a grid-tie system. Your panels are connected to the local electricity grid. The good thing is that when there’s not enough sunlight, you can still use electricity from the grid.
However, if the grid goes down, you won’t have power either. On the plus side, if you produce more energy than you use, the excess goes back into the grid, and you’ll see a lower bill. This excess energy can be used later.
How Solar Panels Work With Batteries
A solar panel connected to a battery is a self-consumption system. This means you’re not dependent on the local energy grid. Your home produces and stores its own energy. Having a battery means you’ll still have electricity when there’s no sunlight, as the battery stores energy from earlier.
This setup is great for people living in remote areas without access to the electricity grid. It’s also useful for those who want to be energy-independent.
The Cost of Batteries for Solar Panels
The cost of solar batteries depends on a few factors. These include storage capacity, usage, and the type of system you have.
Here are a few examples:
- Enphase IQ 5P: a lithium battery with a decent power rating. It’s expandable if you add more panels. The price is around $7,600.
- Tesla Powerwall 3: a lithium battery with a good price-to-performance ratio. It costs $15,500, including installation.
- Canadian Solar EP Cube: a budget-friendly lithium battery. It’s easy to install but not favored by many installers. It costs around $15,000, including installation.
Permits Needed for Solar Panel Installation in Mexico
In Mexico, solar panel installation is regulated by the Energy Transition Law and the Electricity Industry Law. You need to register your system with the National Commission for the Efficient Use of Energy (CONUEE) and meet the requirements of the Federal Electricity Commission (CFE).
To install a solar panel system, you’ll need:
- A system design
- Access and grid connection permits
- Taxes and construction permits
- Administrative and environmental authorization
For small systems, you might not need all these permits. It’s best to check with the CFE to see what you need.
Benefits of Installing Solar Batteries
Installing solar batteries has many benefits. While not strictly necessary with a grid-tie system, it’s still a good idea.
One benefit is that you can store excess energy. If your home produces more energy than it uses, you can store it for later. You can use this stored energy in three ways:
- If your system is off-grid, you can use the stored energy when there’s no sunlight.
- If your system is grid-tied, you can use the battery as a backup when the grid fails.
- You can also sell the stored energy back to the grid and get a credit on your bill.
To maximize the benefits, consider consulting a professional to know how to install batteries into solar panels.
Choosing the Right Battery
The best battery for your solar panels depends on your energy needs, system size, and type. Here are some options:
- AGM batteries: lead-acid batteries suitable for small systems. They’re maintenance-free and last 5-10 years. Prices range from $500 to $2,000.
- Monoblock batteries: ideal for low-to-medium power consumption. They last 4-5 years and cost around $700.
- Stationary batteries: suitable for high and continuous consumption. They last up to 20 years but are more expensive, costing around $2,200.
- Lithium batteries: the most recommended type. They’re maintenance-free, lightweight, and charge quickly. Prices start at around $2,800.
While not mandatory, investing in a solar battery is a smart move if you want to maximize your solar panel system’s potential.