Do I Still Have Power During an Outage If I Have Solar Panels?

Do I Still Have Power During an Outage If I Have Solar Panels?

This is one of the most common questions Ontario homeowners ask after installing solar panels — and the answer surprises many people. Whether you have power during an outage depends not just on whether you have solar panels, but on how your solar system is configured. Here is what you need to know.

Grid-Tied Solar: No Power During an Outage

If you have a standard grid-tied solar system without battery backup, your solar panels will not power your home during a grid outage — even on a sunny day. This surprises many solar owners.

The reason is a safety requirement called anti-islanding protection. Grid-tied solar inverters are required by code to detect a grid outage and shut down automatically within seconds. This prevents your solar system from sending power back onto the utility lines while workers are trying to repair the outage — a situation that could be lethal for line workers.

The result: no grid power + no battery = no power, even with solar panels on your roof.

Solar With Battery Backup: Power During an Outage

If your solar system includes a battery backup (such as Tesla Powerwall or a similar home battery), the situation is different. When the grid goes down, the battery’s gateway device disconnects your home from the utility lines and the battery takes over. Your solar panels can continue generating power and recharging the battery — allowing you to run your home through an extended outage as long as the sun is shining.

The loads you can power during an outage depend on the battery’s capacity and the size of your solar array. Essential loads — refrigerator, lights, outlets, phone charging — can typically be maintained indefinitely in summer conditions. High-draw appliances like central air conditioning and electric vehicle chargers may require additional battery capacity.

Some Inverters Have a Limited Daytime Backup Mode

Certain solar inverters offer a limited “off-grid” or “safe supply” mode that allows a small amount of solar power output from a dedicated outlet during an outage — without a full battery system. This is not whole-home backup; it typically powers a single circuit or outlet at reduced capacity. Check with your inverter manufacturer to confirm whether this feature is available on your model.

What to Do If You Want Power During Outages

To have reliable power during a grid outage, you need one of the following:

• Solar + home battery backup — the most seamless solution; provides automatic whole-home or partial-home backup with solar recharging
• Standby generator with automatic transfer switch — starts automatically during an outage; does not require solar
• Portable generator with a transfer switch or interlock — manual activation; lower cost entry point

Talk to EZSMART About Battery Backup for Your Solar System

EZSMART installs battery backup systems for existing solar installations and new solar projects across Ontario. We can assess your panel and add the battery integration with the required ESA permit.

Contact us today to discuss battery backup options for your home.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp