SolarEdge has released residential firmware bundle 4.22.39 for its home inverter range, listed among the versions on the company's residential inverter firmware page1. The release adds phase imbalance monitoring per phase, G100 monitoring features for the UK market and updates to the country table1.
The firmware page lists 4.22.39 alongside later bundles, including 4.22.44, 4.23.27, 4.23.36 and 4.24.9, which the company describes as "the latest release notes for 4.24.9, Residential Bundle Release"1. The page also carries a UK-only version, 4.19.18, and versions restricted to other markets1.
G100 appears repeatedly in the release notes. The company states that the Home EV Charger "is now fully G100 compliant for the UK market, derating itself according to the site limits that are configured", with a note that this is approved only for single-phase systems1. The notes also record that "the ability to move the system from G.100 Restricted/Locked mode to Normal operational mode was add to the Monitoring Web system"1. A separate fixed issue records that in some cases the export limit control was not activated, and that if a system is in Lock mode it is recommended to unlock it before performing the upgrade1.
Other changes recorded across the bundles include:
| Item | Detail given |
|---|---|
| Home Battery 48V usable capacity | 4.85kWh per module, against 4.6kWh previously, for sites with a Backup Interface commissioned after January 20251 |
| Backup Reserve minimum | Was 5%, now 0% again1 |
| Load Controller | Can be configured as an SG-Ready controller for heat pumps1 |
| EV charger phase switching | Single-phase mode lowers the charging threshold to 1.4kW, against 4.2kW on three-phase1 |
| Optimiser support | Inverters now supporting S650A optimisers for modules up to 650W1 |
The page states that the increased usable capacity of the SolarEdge Home Battery 48V applies "As of January 2025"1. It also records a known issue that the 48V battery model shown in the mySolarEdge app and monitoring was not updated to align with the increased usable capacity for existing installations, with a workaround of removing and adding back the batteries, and notes that for new commissioning with firmware bundle 4.23.36 and above the model is updated correctly1.
On grid connection rules, the page states that requirements "will become mandatory for sites commissioned after May 1, 2023" and that something "came into effect from 1 July 2023", without further detail in the text available1.
Why it matters for households
Firmware determines how much of a home's solar generation is used on site, how a battery behaves and whether an inverter respects the export limit its network operator has set. The G100 items matter because export limitation is the mechanism that lets a property with a larger array or battery stay within an agreed connection limit; a system sitting in a restricted or locked state can hold back export until it is returned to normal operation1. The per-phase imbalance reporting added in 4.22.39 relates to how load is spread across phases in a three-phase supply1.
The battery capacity change is a presentation and configuration matter as much as a technical one: the notes give 4.85kWh per module against 4.6kWh previously, and record that the app and monitoring did not always reflect this for existing installations1. The Backup Reserve minimum returning to 0% changes how much of a battery can be held back for outage cover1. The SG-Ready Load Controller option extends control to heat pumps, which affects how surplus generation is used for heating1.
What happens next
The page lists 4.24.9 as the latest residential bundle release, with 4.22.39 appearing as an earlier version in the same list1. No dates for further releases, and no UK-specific rollout schedule for 4.22.39, have been reported1.
Sources1 cited
- Firmware Updates for Residential Inverters | SolarEdge, solaredge.com