SolarEdge released residential firmware bundle 4.21.23, listed on its residential inverter firmware page among the versions available for download1. The release adds multi-inverter backup support, IEC63027:2023 arc-fault circuit interrupter (AFCI) compliance for low-power single-phase inverters, and support for up to three EV chargers at one site1.
The maker's firmware page lists 4.21.23 alongside later bundles, including 4.22.39, 4.22.44, 4.23.27, 4.23.36 and 4.24.9, which the page describes as "the latest release notes for 4.24.9, Residential Bundle Release"1. The page does not give a release date for 4.21.23 itself; the dated entries it carries are for other versions, including "Release Date: September 2024", "Release Date: July 2024", "Release Date: March 2024" and "Release Date: November 2024"1. The date of the 4.21.23 release has not been reported on the page.
Later bundles in the same series carry features that bear on how a home runs. Version 4.23.36 added a setting letting an owner choose whether the EV charger may draw energy from the home battery, with the battery blocked from discharging to the EV, home or other loads when disabled1. Version 4.24.9 added manual phase switching on the SolarEdge ONE EV Charger, which the notes describe as follows:
"Due to the EV's inverter, a minimum current of 6A per phase is necessary to start a charging session. This means on a 3 phase charger the min. Charging needs to be higher than 4.2 kW in order to get a charge going. By selecting 1 phase mode, the threshold gets lowered to 1.4 kW."
The same notes record that the SolarEdge Home Battery 48V has an increased usable capacity of "4.85kWh (instead of previously 4.6kWh)" per module, and that the Backup Reserve minimum value, previously 5%, is "now it's 0% again"1. The page states that "As of January 2025, SolarEdge Home battery 48V has an increased usable capacity of" 4.85kWh per module for sites with a Backup Interface commissioned after January 20251. It also records that the Home EV Charger is "now fully G100 compliant for the UK market, derating itself according to the site limits that are configured", approved only for single-phase systems1.
| Item | Detail given |
|---|---|
| Bundle in this release | 4.21.23 |
| Multi-inverter backup | Supported |
| AFCI standard | IEC63027:2023, low-power single-phase inverters |
| EV chargers per site | Up to 3 |
| Later bundle named as latest | 4.24.9 |
Why it matters for households
Firmware decides what a home's inverter, battery and charger will actually do, and the changes recorded in this series touch the parts of a system a household notices. Multi-inverter backup support matters where a property runs more than one inverter and expects the backed-up circuits to keep running together during an outage. AFCI compliance is a safety function that detects certain arc faults in DC wiring, and its inclusion for low-power single-phase inverters is a compliance matter rather than a performance one. Support for up to three EV chargers per site extends what a single household electrical arrangement can coordinate.
The later entries show the direction of travel: control over whether the car draws from the home battery, and phase switching that lowers the surplus power needed before charging starts from 4.2 kW to 1.4 kW. Both affect how much self-generated electricity a home keeps for itself rather than exporting or buying in. The battery capacity and reserve changes affect how much stored energy is available and how far a household can run its reserve down. Firmware is delivered to equipment already installed, so what a system can do can change after commissioning, and the version fitted to a given unit is worth knowing. Details of how updates reach equipment and how long support lasts are set out in Firmware Updates, App Support and Product Lifespan, with the hardware context in Inverters and Inverter-Chargers for Backup Power and EV Charger Apps, Wi-Fi, 4G and Firmware.
What happens next
The page lists 4.24.9 as the latest residential bundle release, with 4.21.23 one of several earlier versions still listed1. No timetable for further releases, and no end-of-support date for 4.21.23, has been reported1.
Sources1 cited
- Firmware Updates for Residential Inverters | SolarEdge, solaredge.com