Can I Use My Solar Power During a Power Cut?

Discover how to keep the lights on when the grid goes down — using solar energy.

⚡️ Power Cut? Here’s the Reality for Solar Owners in Ireland

If you’ve invested in solar panels, it’s natural to assume that you’ll still have electricity during a blackout. After all, your roof is generating power — right?

Unfortunately, the answer isn’t that simple.

Most Irish homes with standard solar panel systems do not retain power during a blackout — unless they’re specifically set up to do so.

Here’s why that happens, and how to set up your system to keep running even when the grid goes down.

🔌 Why Most Solar Systems Shut Down in a Blackout

Most residential solar systems in Ireland are grid-tied — meaning they send excess electricity back to the grid and pull power from it when needed.

During a power cut:

• The grid shuts down for safety and maintenance.
• Grid-tied inverters are automatically disabled.
• This prevents your system from sending power into a downed grid, which could endanger workers.

Result: Your panels stop working — even on a sunny day.

🔋 How to Use Solar Power During a Blackout

To keep using solar during a power cut, you need an off-grid or hybrid system. These systems store your solar energy locally, so you’re not reliant on the grid in an emergency.

There are two main options:

1. ✅ Solar Battery Backup System (Hybrid Inverter)

• Stores excess solar power in a battery.
• Detects a power cut and switches to battery mode automatically.
• Keeps powering essentials: lights, fridge, Wi-Fi, etc.

What you’ll need:

• A hybrid inverter
• A solar battery (e.g. 2kWh–10kWh)
• Optional: backup panel to isolate circuits you want powered

2. 🔋 Standalone Solar Generator or Power Station

• Fully portable, plug-and-play system
• Charges from solar panels or mains power
• Ideal for renters, campers, or occasional use during blackouts

Great for:

• Running small devices, charging phones, powering routers
• Emergency backup without a full solar installation

🏠 What Can You Power with Solar Backup?

It depends on your battery capacity. Here’s a rough guide:

🧰 How to Set It Up (Simplified)

Choose your system
→ Portable solar generator or permanent battery backup

Install or position your solar panels
→ South-facing for best output; avoid shading

Connect your inverter and battery
→ Ensure compatibility with solar panel wattage

Test your system
→ Simulate a blackout and confirm that your backup powers on correctly

🔐 Bonus: Use an Automatic Transfer Switch (ATS)

If you’re powering a home or office setup, consider an ATS:

• Automatically detects outages
• Switches power source from grid to battery
• Seamless experience — no flickering lights or unplugging needed

🇮🇪 Can You Do This in Ireland Legally?

Yes. But:

• Grid-tied systems with batteries must follow ESB Networks safety guidelines
• DIY setups should be professionally reviewed if you’re wiring into your home’s circuits
• Portable systems (e.g. plug-in generators) are safe for general use and don’t require permissions

✅ Final Thoughts: Yes, You Can Use Solar in a Blackout — If You’re Prepared

Most homes in Ireland with basic solar setups won’t have power during an outage. But with the right equipment — like a solar battery, hybrid inverter, or portable solar generator — you can keep your home running smoothly when the grid goes down.

As energy prices rise and grid stability becomes more of a concern, a solar backup setup isn’t just a luxury — it’s a smart move.

❓FAQs

Q: Can I add a battery to my existing solar system?
Yes, but you may need a hybrid inverter or compatible storage device.

Q: How long will a solar generator last during a blackout?
It depends on wattage and battery capacity. A 500Wh system can power lights and phones for a few hours; 1000Wh+ handles fridges and routers for longer.

Q: Do I need planning permission?
Not for portable systems. For fixed installations, planning exemptions usually apply, but check with your local council or SEAI guidelines.