BrightGridMany homeowners who already have solar panels later decide to add battery storage. The feasibility and best configuration depend heavily on the existing inverter and electrical design.
Can every solar system accept a battery?
No. The existing inverter may be battery-compatible, or the property may require an additional battery inverter or a different system architecture.
AC-coupled battery systems
An AC-coupled battery system can operate alongside an existing solar inverter using its own battery inverter. This can be useful for certain retrofit projects.
Hybrid inverter systems
A hybrid inverter can combine solar and battery functions within a coordinated system. Replacing an existing inverter may make sense in some projects but not all.
What should an installer check?
- Existing inverter model
- Solar array size
- Battery compatibility
- Existing electrical system
- Available installation space
- Tariff requirements
- Backup requirements
- Expected electricity consumption
Battery retrofits need system-level design
The cheapest battery is not necessarily the best retrofit. Compatibility, efficiency, control strategy and installation cost all matter.
Check your existing solar system
Find out whether your current solar installation can support a battery retrofit.
Check Your SystemFrequently asked questions
Can I add a battery to my existing solar panels?
In many cases yes, but the existing inverter and electrical installation need to be assessed.
Do I need a new inverter for a solar battery?
Not always. Some systems can use an additional battery inverter while others may benefit from a hybrid inverter.
Is adding a battery later more expensive?
A retrofit can involve additional equipment and installation work, but the best approach depends on the existing system.
Can an existing solar battery provide backup power?
Backup capability depends on the battery, inverter and electrical design. It should be specifically designed for backup operation.
Lucy Harrington
Energy Storage Consultant at BrightGrid Energy
