Understanding Retrofit Battery Storage Systems
Adding battery storage to existing solar panels is not only possible but increasingly popular across the UK. Most modern solar panel systems can be retrofitted with battery storage, allowing you to store excess energy generated during the day for use during evening peak times or power cuts.
The key consideration is compatibility between your existing solar inverter and the battery system. Some installations require an AC-coupled battery system that works independently, whilst others may benefit from upgrading to a hybrid inverter that manages both solar panels and batteries together.
Types of Retrofit Battery Solutions
AC-Coupled Battery Systems
AC-coupled batteries connect to your existing solar system without replacing the inverter. They’re ideal for installations where the solar inverter is relatively new and under warranty. These systems work by converting AC power back to DC for storage, then back to AC for use in your home.
DC-Coupled with Hybrid Inverter
If your solar inverter is older or nearing the end of its lifespan, upgrading to a hybrid inverter creates a more efficient system. DC-coupled batteries reduce conversion losses and often provide better overall performance, though the upfront cost includes both battery and inverter replacement.
Cost Considerations for Retrofitting Battery Storage
Retrofit battery storage systems in the UK typically range from £3,000 to £8,000 depending on capacity and installation complexity. A typical 5kWh system costs around £4,500 installed, whilst larger 10kWh systems range from £6,000 to £8,000.
Factors affecting cost include:
– Battery capacity and brand (Tesla Powerwall, GivEnergy, Solax)
– Whether you need a new hybrid inverter
– Electrical work required to integrate the system
– Any necessary consumer unit upgrades
Technical Requirements and Compatibility
Before retrofitting battery storage, a qualified installer should assess:
– Your existing inverter type and age
– Available space for battery installation (typically garage or utility room)
– Your household’s energy consumption patterns
– The condition of your existing electrical installation
– Whether your consumer unit has capacity for additional circuits
Most installations completed after 2015 are relatively straightforward to retrofit, whilst older systems may require more extensive upgrades.
Installation Process and Timeline
A typical retrofit battery installation takes 1-2 days and involves:
1. Electrical isolation and safety checks
2. Battery unit mounting and connection
3. Integration with existing solar system
4. Configuration and commissioning
5. Handover and user training
You’ll need to notify your District Network Operator (DNO) of the changes, though this is typically handled by your installer as part of the G98 or G99 application process.
Is Retrofitting Right for Your Home?
Battery storage makes most financial sense if you:
– Generate more solar energy than you use during daylight hours
– Have high evening electricity consumption
– Are on a time-of-use tariff like Octopus Agile or Go
– Want backup power capability for outages
– Plan to add an EV charger in future
Why Choose Oakford Integration for Battery Retrofits
Our team has extensive experience retrofitting battery storage across Wiltshire and surrounding areas. We handle all aspects from initial assessment through to DNO notification and aftercare support.
Get in touch for a free, no-obligation assessment of your existing solar system and personalised battery storage recommendations.
Upgrade Your System and Increase Savings
Already have solar panels?
You can still benefit from battery storage.
Retrofitting a Battery System
In most cases, battery storage can be added to:
- Existing solar systems
- Older installations
- Systems without storage
Benefits of Adding a Battery
- Use more of your generated energy
- Reduce grid electricity usage
- Increase overall savings
What Needs to Be Checked?
- Existing inverter compatibility
- Available space for battery installation
- Current system performance
Upgrade Your System the Right Way
A properly integrated system ensures:
- Smooth operation
- Optimal performance
- Long-term reliability
Request an Upgrade Assessment
