What Happens to Your Home When the Power Goes Off?
A power cut is usually an inconvenience. But for a household that relies on electricity for heating, refrigeration, internet, lighting or other essential equipment, even a relatively short outage can be disruptive. This is where an Emergency Power Supply (EPS) system can make a difference.
Why don’t normal solar panels keep the lights on during a power cut?
It is easy to assume that having solar panels means your home will continue to have electricity when the grid goes down. In most standard grid-connected solar installations, that is not the case.
During a mains power failure, a typical solar PV system is designed to shut down rather than continue exporting electricity to the grid. This is an important safety requirement. A standard solar installation therefore should not be treated as a backup generator.
If you want your home to have backup power during an outage, the system needs to be designed with suitable backup equipment and configuration.
What is an Emergency Power Supply (EPS) system?
An EPS system is designed to provide a home with backup electricity when the mains supply fails. Depending on the system design, it can work alongside solar panels and battery storage so that selected appliances or circuits can continue operating during an outage.
The exact setup depends on the property, the existing electrical installation, the battery system and what you want to keep running. That is why backup power should be designed around the household rather than treated as a one-size-fits-all product.
What can an EPS system power?
There are generally two approaches to backup power: protecting selected essential circuits or providing wider whole-home backup.
Lighting
Refrigeration
Internet and communications equipment
Selected sockets
Heating controls or other priority equipment
Essential circuits or whole-home backup?
For some households, keeping a small number of essential circuits powered is the most practical option. For others, a larger system may be appropriate to provide backup to more of the property.
The right choice depends on the home's electrical demand, the available battery capacity and the homeowner's priorities. A professional assessment should establish what needs to be backed up and for how long.
How does the system respond when the power fails?
An appropriately configured EPS system detects a mains failure and transfers the supported circuits to the backup supply. The exact changeover time depends on the equipment and system design, so it is important to discuss the specification with your installer rather than assuming every system behaves in exactly the same way.
Backup duration also varies. A battery supporting a small number of essential loads will generally last longer than the same battery supporting a much larger electrical demand.
Is EPS worth considering if you already have solar and a battery?
It can be, particularly if one of the reasons you installed solar and battery storage was to have greater resilience as well as lower electricity costs.
However, not every battery installation automatically provides backup power during an outage. Backup capability needs the appropriate equipment, electrical configuration and commissioning.
Choosing an EPS system for your home
Start with what you actually need the system to achieve. Do you simply want the fridge, lights and internet to remain available? Do you need heating controls to stay operational? Or are you looking for broader whole-home backup?
A good installer should assess your electrical setup and usage before recommending the equipment. They should also explain which circuits will be protected, the expected backup duration and how the system behaves when the grid supply returns.
Ready to Find Out More?
If you are considering backup power for your home in Essex or London, AJK Energy can assess your requirements and explain the available EPS options.
Call 01708 693180 or request a quote through the AJK Energy website.
Emergency Power Specialists Serving Essex & East London • MCS Certified Solar & Battery Installers • 7 Years of Local Experience • Integrated Solar + Battery Solutions
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