Upgrade your existing battery with more storage capacity to keep more of your solar energy for when you need it most.
Add More Capacity to Your Existing Battery System
Your energy use may have increased since the original battery was installed. An electric vehicle, heat pump, larger household, home working or a change in electricity tariff can all affect the amount of storage that makes sense.
BatteryInstall.ie assesses whether your existing system can accept additional battery modules and whether expansion is the right solution.
Signs You May Need More Battery Capacity
- The battery regularly reaches full charge while solar is still being exported
- The battery empties early in the evening
- You have added an EV, heat pump or other major electrical load
- You want to store more lower-cost night-rate electricity
- Your electricity use has increased
- The original battery was deliberately sized for later expansion
- Your business needs more stored energy outside solar-generation hours
Why Expansion Is Not Always Straightforward
Battery systems are managed by a battery management system, or BMS. It controls how modules charge, discharge, balance and communicate with the inverter. Adding capacity is therefore more than connecting another battery cabinet.
Manufacturers may restrict which modules can be combined. Batteries of different models, voltages, generations, firmware versions, capacities or ages may not be approved for use together.
What We Check
- Battery manufacturer, model and serial number
- Existing number of modules and usable capacity
- Battery age, health and operating history
- Inverter model and maximum supported storage capacity
- BMS version and permitted expansion configuration
- Firmware compatibility
- Available electrical and communications connections
- Physical space, clearances and mounting arrangement
- Cabling, isolators and protection
- Whether the additional capacity is likely to be used effectively
Possible Expansion Routes
Add Matching Modules
Where the manufacturer permits it, matching modules may be added to the existing battery stack or cabinet.
Add a Separate Compatible Battery System
If the original system cannot be expanded directly, a separate battery system may sometimes be installed. Controls, metering and charging behaviour must be designed carefully so the systems operate as intended.
Replace or Reconfigure the Existing Storage
Where equipment is obsolete, unsupported or unsuitable, replacing the existing battery may be more practical than attempting to expand it. We explain the options before recommending replacement.
A product with the same brand name may still be incompatible with an earlier generation. Exact product codes, firmware and manufacturer expansion rules should be checked before equipment is ordered.