AlphaESS 5kW Inverter and 5kWh Battery All-in-One

AlphaESS provides a 5-year standard product warranty on the inverter unit and components, and a 10-year performance warranty on the lithium battery module. The 10-year battery warranty typically guarantees a high percentage of the original storage capacity (for example, ~80% capacity remaining after 10 years or a set number of cycles).
To ensure full warranty coverage and optimal performance, it’s recommended to keep the system connected to the internet for monitoring – per AlphaESS guidelines, lack of online monitoring can reduce the warranty term on the system. With proper installation and use, customers can expect the system to last well beyond the warranty period, as AlphaESS has a track record of high product reliability.

Yes. The AlphaESS 5kW inverter & battery system is designed with built-in UPS functionality. In the event of a grid outage, it can automatically switch to battery power in under 20 milliseconds, keeping your critical loads running without interruption. This means important appliances (like lights, fridge, computer, etc., up to the 5 kW load limit) will continue to operate as if nothing happened.
The switch-over is fast enough that electronics won’t reboot or flicker.
Additionally, if solar panels are connected to the SMILE5, the system can continue to charge the battery from sunlight during an extended outage, extending your backup runtime.
For safety, an approved backup circuit or emergency power point is set up during installation to isolate backed-up loads from the grid. This feature makes the AlphaESS unit very useful for customers who need power security in addition to energy savings.

Absolutely. One of the strengths of the AlphaESS SMILE5 system is its flexibility to work in different setups. It can be added to an existing solar PV installation via AC coupling, meaning you don’t have to replace your current solar inverter – the AlphaESS will simply charge its battery using surplus power from the grid side. The system intelligently senses when your solar panels (with their own inverter) are sending excess power to the grid and will instead divert that into the battery.
On the other hand, the SMILE5 can also function as a primary solar inverter (DC coupled) for a new installation. In that case, solar panels connect directly into the AlphaESS unit’s MPPT inputs, and it handles both PV generation and battery charging/discharging. This hybrid capability makes it compatible with virtually any single-phase solar setup. It’s also worth noting that the AlphaESS is single-phase only – for three-phase properties, multiple units (one per phase) or a different model would be required.
Overall, if you have an existing solar system, the AlphaESS can integrate with it, and if you’re starting fresh, it can serve as the sole inverter for both solar and storage.

The SMILE-S5 comes with a single 5.04 kWh nominal-capacity battery module (4.79 kWh usable at 95 % DoD). It supports “External Battery Expansion” by adding 1 to 5 additional identical 5.04 kWh modules in parallel, allowing total storage to scale from 5.04 kWh up to 30.24 kWh (5.04 kWh × 6 modules). Expansion must be performed by a qualified installer and is plug-and-play within the system’s hybrid architecture.

Monitoring and control of the AlphaESS 5kW/5kWh system are very user-friendly. The system comes with access to AlphaCloud, an online monitoring portal, and a companion AlphaESS mobile app.
Once the inverter is connected to the internet (via Wi-Fi or Ethernet), you can log in to view real-time data on solar production, battery charge level, power consumption, and more from your computer or smartphone.
The interface provides detailed charts and statistics, which are invaluable for both end-users and installers (for remote diagnostics). You can set charging/discharging schedules (for example, charge from solar or off-peak grid power at certain times, discharge during peak times) to optimize savings. The system will also send alerts or notifications if any issue arises, so proactive maintenance is possible. AlphaESS’s platform enables remote firmware updates and troubleshooting as well-– often the installer or support team can update settings or software without a site visit.
Additionally, on the unit itself, there’s an LCD screen and control buttons that allow basic configuration and instant performance readouts for on-site personnel.
Overall, the combination of the cloud portal and local controls gives a high degree of transparency and manageability. Contractors especially appreciate the 24/7 monitoring capability, as they can oversee multiple client systems from a central dashboard, ensuring all are performing optimally.