Firmware Updates for Home Batteries: Why They Matter

What is firmware and why is it important?

Firmware is the software embedded in the hardware components of your home battery: the Battery Management System (BMS), the inverter, the gateway, and any communication modules. This software determines how the battery charges, discharges, communicates, and protects itself against overload.

Just like the software on your smartphone or laptop, firmware requires regular updates to fix bugs, improve performance, and patch security vulnerabilities. Home battery manufacturers release an average of 2–6 updates per year, depending on the brand and product line.

What do firmware updates specifically improve?

Firmware updates address five categories:

• Security patches: close vulnerabilities in the software that could cause unauthorised access or incorrect switching
• Performance improvements: optimisation of charge and discharge algorithms for better efficiency (sometimes +2–5% yield)
• Cell balancing: improved algorithms for active cell balancing, which extends lifespan
• Bug fixes: resolving known software bugs that cause error messages or incorrect readings
• New features: support for new tariff structures, additional grid service protocols, or integration with new apps

Firmware update frequency by brand

Below is a comparison of the update frequency and method for the best-selling brands:

Most modern home batteries support automatic updates via WiFi. Sometimes a small performance improvement is even visible in the monitoring app: you'll notice the system has become more efficient without having to do anything.

How do you install a firmware update?

The installation method varies by brand:

Automatic updates via WiFi

Most systems are connected to WiFi and automatically check for available updates. Updates are typically performed overnight, outside peak hours. You don't need to do anything. Just ensure the WiFi connection is stable and the gateway is switched on.

Manual updates via USB or app

For systems without a WiFi connection or for manufacturers that don't support automatic OTA (over-the-air) updates, you download the firmware from the manufacturer's website and connect a USB drive to the gateway or system. Always follow the exact instructions in the manual.

Risks and precautions

Keep the following in mind with firmware updates:

• Never perform an update during a thunderstorm or power outage: an interrupted update can damage the system
• Read the release notes: manufacturers publish what has changed; check for any known installation issues
• Back up your system settings: some updates reset the configuration

Conclusion: updating is not optional

A home battery is an investment that should last 15–25 years. Firmware updates are the key to keeping that investment performing optimally. They are free, largely automatic, and ensure your system always performs at its best — safer, more efficient, and more compatible with new features.

At Home Energy Solutions, we inform you at purchase about your battery brand's update policy and assist you with any manual updates. Get in touch if you need help.