Solar Battery Backup: Types, Costs, and Rebates
Power outages can happen when you least expect them, and it is often when you experience a blackout firsthand that the value of backup power really starts to sink in. With a solar battery backup, your home stays connected, keeps your major appliances running, and powers your essential devices. It’s also helpful if winter storms and power outages are common in your area.
This guide explains what a solar battery backup system is, how it works, the battery options that power it, and what it costs in Canada. You will also learn how to select the right solar battery backup and some installation tips.
What Is Solar Battery Backup and How Does It Work?
A solar battery backup is a storage system connected to your home’s electrical panel that automatically activates when the grid fails. Unlike regular storage, its role is to provide uninterrupted power during blackouts. When solar panels produce electricity, some of that energy charges the battery. If the grid goes down, the battery instantly supplies power to selected circuits.
At home, this works through an inverter and a transfer switch that decides where power should flow. During the day, your solar panels generate electricity and release it to your home and the grid, while the battery quietly charges. The moment an outage occurs, the system disconnects from the grid and uses the battery to keep your home running.
Types of Solar Batteries
When investing in a solar battery backup, you will encounter several variations, each with unique strengths and drawbacks. The right option depends on your budget, energy needs, and long-term expectations. Here are the most common types of solar batteries:
1. Lithium-Ion Batteries
Lithium-ion batteries are the most common choice for residential solar systems. They offer high efficiency, long lifespans, and compact designs that fit into modern homes. Since they can be deeply discharged without losing performance, they provide reliable energy when you need it most.
However, lithium-ion systems can be more expensive upfront compared to other technologies. They also require careful installation with proper ventilation to reduce overheating risks. Despite the higher cost, they’re a practical choice due to their durability and low maintenance needs.
2. Lead-Acid Batteries
Lead-acid batteries are a traditional storage option with a lower upfront cost. They are well-tested, familiar in the market, and often used in off-grid setups. Their availability makes them attractive for those who need a more affordable way to start with storage.
On the downside, lead-acid batteries have shorter lifespans and require more space due to their bulkier design. They also need regular maintenance, such as topping up electrolytes, which may not appeal to every household.
3. Flow Batteries
Flow batteries are an emerging technology that stores energy in liquid electrolytes. They allow for almost unlimited discharge cycles, making them appealing for future large-scale or long-duration storage. Their stable performance under deep cycling can provide continuous backup power without rapid degradation.
The challenge is that flow batteries are still expensive and require more physical space than lithium-ion or lead-acid options. Their limited availability in the residential market also makes them less practical today. Still, they represent a promising technology for homeowners who want to future-proof their investment.
How to Choose the Right Solar Battery Backup for Your Home
Selecting the right solar battery backup for your home depends on your energy usage, budget, and installation conditions. A thoughtful approach will ensure you invest in a system that balances cost with long-term performance. Here’s how to select the right one:
1. Determine Your Energy Needs
Calculate how much electricity your household consumes daily. A clear understanding of peak usage will help you choose the right battery size. For example, if you want backup power for just essentials like lighting and refrigeration, your capacity needs may be smaller than running the whole house.
2. Compare Battery Lifespan and Efficiency
Different batteries have varying lifespans, with lithium-ion generally lasting the longest. Efficiency is also important because higher efficiency means more usable power from your stored energy. This can significantly affect your return on investment.
3. Consider Budget and Rebates
Cost plays a major role, especially since installation and equipment can be significant. Look into provincial or federal solar rebate and battery rebate programs that may reduce upfront expenses. This financial support can make premium options more affordable.
4. Space and Installation Requirements
Some batteries are compact, while others require more room and ventilation. Ensure your property can accommodate the system safely. Proper installation by a certified Canadian installer will also prevent long-term performance issues.
What Does a Solar Battery Backup Cost?
The average cost of installing a solar battery backup system typically ranges from $12,000 to $20,000, based on estimates from leading industry providers. This price includes the battery itself, labor, permitting, and related components. The battery portion alone starts around $8,000, with the addition of necessary hardware and installation potentially adding another $4,000 to $12,000 to the total cost.
Factors Influencing Cost:
Battery Capacity: Larger capacity systems tend to cost more.
Battery Chemistry: Different battery types have varying price points.
Backup Features: Systems with advanced backup features or integration options may incur additional costs.
Local Factors:
Labour rates, utility interconnection fees, and permitting costs vary by region.
In rural or remote areas, extra wiring and long distances can drive up costs.
Brand Premiums: Premium brands usually come at a higher price.
Rebate Programs:
Ontario: The Home Renovation Savings Program offers up to $5,000 off for battery storage systems, provided you install the battery along with rooftop solar panels. This rebate can cover up to 50% of the upfront cost of your system.
British Columbia: The BC Hydro offers homeowners up to $5,000 toward battery storage systems and another $5,000 for solar panel installations under its Solar and Battery Rebate initiative.
Toronto: Under the Home Renovation Savings program that includes a rooftop solar rebate, homeowners installing new rooftop solar panels and battery storage systems may receive rebates of up to $10,000. The system must be a new installation (not simply replacing existing panels), must be sized for load displacement only, and net-metering is not permitted.
Additional Financing Options: The Home Energy Loan Program (HELP) offers low-interest financing up to $125,000 to help with upfront costs of eligible energy-efficient upgrades including solar and storage.
However, there are conditions you need to watch out for. Your system must be paired with a new solar panel installation. Therefore, batteries alone often don’t qualify. Also, net-metering rules or exporting excess power to the grid may disqualify you from certain rebates under the program. You must also have a proper installer, the right type of home, and submit the required paperwork.
Installation Tips for a Smooth Solar Battery Backup Setup
Setting up a solar battery backup requires careful planning and proper installation to ensure safety and performance. By preparing early, you can avoid delays and costly mistakes. Here are some practical installation tips you should consider:
1. Hire a Certified Installer
The first and most important step is working with a licensed and experienced installer who specializes in solar battery backup systems. They know the local building codes, electrical standards, and utility interconnection rules that must be followed. A certified professional also ensures the battery is integrated safely with your existing solar panels and inverter.
2. Choose the Right Battery Size for Your Needs
Not all households require the same storage capacity. The right size depends on how much energy you use, the number of appliances you want to run during an outage, and whether you want whole-home or partial backup. For example, a smaller system may cover essentials like lights and refrigeration, while larger batteries can power air conditioning or electric heating.
3. Integrate with a Portable Power Station for Flexibility
A portable power station can be a smart addition alongside a fixed solar battery backup. While the main battery covers your home, a portable unit lets you bring stored energy to campsites, outdoor events, or even different rooms in your house during a power outage. This flexibility makes portable power stations an excellent complement to a home solar setup.
4. Plan for Emergency Preparedness
Every May, Canada observes Emergency Preparedness Week, a nationwide campaign that reminds households to plan for unexpected events such as power outages, storms, or floods. If there is one tip for emergency preparedness worth following, it is having a reliable backup energy source.
Some solar battery backups, such as the EcoFlow DELTA 3 Plus Portable Power Station, can function both on-grid and off-grid, plus it comes with 1800W AC output, 1024 Wh capacity with expandable batteries. Being prepared gives you peace of mind knowing that you can keep your household safe and functional in times of crisis.
EcoFlow DELTA 3 Plus Portable Power Station
5. Ensure Proper Placement and Ventilation
Where you place your solar battery matters for both safety and performance. Batteries should be stored in a cool and well-ventilated space, such as a garage or basement. It should be away from direct sunlight and moisture. This prevents overheating and extends the battery’s life cycle. Good placement also ensures quick access if professional service is required.
Conclusion
A solar battery backup gives you the ability to store the power you generate and use it when you need it most. You’ve seen how it works, the different types of batteries available, and how to choose the right one for your home. We also looked at the average costs, along with rebates that can make the investment easier to manage. On top of that, proper installation steps make sure your system lasts and performs well. Adding in options like portable power stations makes your setup even more flexible and useful in emergencies.
*Disclaimer: Before reading this guidance, please note that rebate programs can vary based on individual circumstances, location, and eligibility criteria. EcoFlow does not provide any assurances or guarantees concerning potential rebates associated with our products. Any information in this guidance is solely for educational purposes and shall not be construed as legal or financial advice. We recommend you consult the official program guidelines or seek professional advice for accurate and personalized information.
FAQs
How long do solar backup batteries last?
A solar backup battery typically lasts between 10 and 15 years, depending on the type and usage. Lithium-ion batteries, which are the most common, last longer than lead-acid options due to their higher cycle life. Proper installation, temperature control, and regular maintenance also play a role in extending battery life. Many lithium-ion batteries maintain 70 to 80 percent of their capacity after a decade. This makes them a reliable long-term energy solution for home energy setups.
Is a 10KW battery enough to run a house?
Yes, a 10kW solar battery can run a typical Canadian home. However, it depends on how much energy you use. For average households, this capacity can power essential appliances such as refrigerators, lights, and electronics for several hours. During an outage, it may not cover energy-intensive systems such as electric heating or air conditioning. Usage patterns and efficiency upgrades also determine how far the battery will go. In most cases, a 10kW battery is a balance of capacity and affordability.
How long will a 200W solar panel charge a 100Ah battery?
A 200W solar panel can charge a 100Ah battery in about 5 to 8 hours of direct sunlight. The exact charging time depends on the weather, season, and the battery’s depth of discharge. For instance, in Canada’s summer months, stronger sunlight can shorten the charging time compared to winter. Efficiency losses from the charge controller or wiring can also slightly extend the duration. On average, a 200W panel is a practical option for recharging a mid-sized battery within a day.