When you invest in solar panels and battery storage, one of the biggest questions on your mind might be: “Will my home still have power if there’s a power cut?”
If you’re considering a Growatt battery system, or already have one installed, you’re not alone in wondering what happens when the grid goes down.
In this article, we’ll explore whether Growatt batteries can keep the lights on during a blackout, how they work alongside your home solar panels, and what you need to know as a South Coast homeowner looking for reliable energy independence.
Why Power Cuts Are a Growing Concern
Power cuts aren’t just a thing of the past. With the UK’s ageing infrastructure, increasing energy demands, and unpredictable weather patterns, outages are still happening — even in well-connected areas like Bournemouth, Poole, Portsmouth, and Southampton.
For homeowners with solar panels, a power cut can feel frustrating. After all, you’re generating electricity — shouldn’t you be able to use it?
That’s where battery storage comes in.
What Is a Growatt Battery?
Growatt is a leading global brand in solar energy storage, known for reliable, efficient and affordable battery solutions. Their home battery systems pair with solar panels to store excess electricity generated during the day, which you can use later — especially during peak pricing times or at night.
But can they help when the grid fails?
Will a Growatt Battery Work in a Power Cut?
The Short Answer:
Yes — but only with the right setup.
By default, Growatt batteries do not automatically provide power during a blackout unless they are installed with Emergency Power Supply (EPS) functionality or connected to a hybrid inverter that supports off-grid operation.
Understanding EPS: The Key to Backup Power
EPS (Emergency Power Supply) is a feature that allows a battery to provide electricity to dedicated circuits in your home when the main grid goes down.
For a Growatt system to function during a power cut:
- You must have a Growatt hybrid inverter (e.g. MIN or MOD series).
- EPS functionality must be enabled during installation.
- Your installer must configure a dedicated backup circuit, usually powering essential items like your fridge, lights, Wi-Fi router, and sockets.
Important: Without EPS, your Growatt battery will shut off during a power cut — even if it’s fully charged. This is a safety feature designed to protect utility workers repairing the grid.
How a Growatt Battery System Works in a Blackout
Here’s what happens when you have EPS configured:
- Power Cut Happens
The grid goes down — your inverter detects the loss of grid power. - EPS Activates Automatically
Within seconds, your Growatt system switches to backup mode. - Essential Circuits Stay On
Only the circuits wired into the EPS system will receive power. These are chosen during the installation process. - Battery Powers Your Home
The battery discharges stored energy to keep your essentials running. - Solar Recharging (Optional)
If it’s daylight, your solar panels may continue to top up the battery (depending on the system design).
What You Can’t Do During a Blackout
It’s important to manage expectations. Even with EPS:
- You won’t be able to run high-load appliances like electric ovens or immersion heaters.
- Your whole house won’t stay powered — just the selected circuits.
- The backup is not indefinite — it depends on how much energy is stored and how quickly you use it.
That said, for many homeowners, it’s more than enough to stay connected, keep the lights on, and avoid spoiled food or lost internet during an outage.
What Are the Benefits of EPS-Enabled Growatt Batteries?
Energy Security – Stay prepared during storms or infrastructure failures.
Peace of Mind – Know that essentials like lighting, refrigeration, and communication won’t go down.
Smart Solar Use – Even during outages, your battery can power key devices without wasting stored solar energy.
Efficient Load Management – You choose what matters most to stay online when the grid doesn’t.
Do I Need EPS?
If you’re on the South Coast — from Dorset to Hampshire to West Sussex — and want true energy independence, EPS is worth considering. While it’s optional, many homeowners now request it as standard due to its obvious resilience benefits.
Our team at My Home Solar can help you design a system that’s future-proof and ready for anything.
Growatt Batteries + Solar Panels = Smarter Living
When paired with solar panels, a Growatt battery transforms your home into a mini power station. You generate your own clean electricity, store it, and use it when it suits you — or when the grid fails.
It’s a great way to:
- Lower your electricity bills.
- Avoid rising energy costs.
- Reduce your carbon footprint.
- Be less reliant on the national grid.
Why Choose My Home Solar?
At My Home Solar, we specialise in providing fully installed solar + battery systems for South Coast homeowners. We work with trusted brands like Growatt, and we understand the specific needs of UK homes when it comes to energy backup and self-sufficiency.
When you work with us, you get:
- Friendly advice and jargon-free guidance.
- EPS-ready installations done right the first time.
- Ongoing aftercare and support — we’re with you long after install day.
- Transparent pricing and flexible finance options.
Is a Growatt Battery Right for You?
If you already have solar panels or you’re thinking about getting a new system, adding a Growatt battery (with EPS) gives you peace of mind and long-term energy savings.
You can keep the power on during a blackout — but only if your system is installed and configured correctly.
Let the experts at My Home Solar help you design the ideal setup for your home, lifestyle, and budget.
Ready for Backup Power You Can Trust?
Contact My Home Solar today for a free consultation and discover how a Growatt battery with EPS can protect your home from future power cuts.
Call us now or Visit myhomesolar.co.uk to get started!
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