--- title: "AERL Firmware and Software — Release Notes" revision: "1.0.0" publisher: AERL (Australian Energy Research Laboratories) url: https://www.aerl.com.au/docs/aerl-release-notes pdf: https://www.aerl.com.au/documents/guides/AERL_Customer_Release_Notes_REV_100.pdf description: "The changes that matter to installers and owners in each released version of the CoolMax SRX / SRX-R and EG-600 firmware, the Nexus gateway software and AERL Link." --- # AERL Firmware and Software — Release Notes *Rev 1.0.0. Markdown copy of the AERL document at https://www.aerl.com.au/docs/aerl-release-notes; the PDF (https://www.aerl.com.au/documents/guides/AERL_Customer_Release_Notes_REV_100.pdf) is the controlled version.* # Release Notes AERL Firmware and Software **CoolMax · EarthGuard · Nexus · AERL Link** **Customer Release Notes** Rev 1.0.0, 8 Nov 2026 ### Document | | | |---|---| | Revision | 1.0.0 | | Effective | 11 / 2026 | | Audience | Installers, service technicians and system owners | | Covers | CoolMax · EarthGuard · Nexus · AERL Link | | Updating | AERL Firmware Update Guide | | Format | A4 · 9 pages | These notes list the changes that matter to installers and owners in each released version of AERL's firmware and software, newest first. They cover the CoolMax SRX and SRX-R charge controllers, the EarthGuard EG-600, the Nexus gateway software and AERL Link. To update a unit, see the AERL Firmware Update Guide. AERL Link and AERL Cloud offer each unit the newest release for it; the release notes for an update are also shown when it is offered. Dates are the month a release was first published. AERL withdraws a release from AERL Link and AERL Cloud when a newer one replaces it; a unit on a withdrawn release keeps working, and is offered the current release. ## 01 CoolMax SRX and SRX-R — Current release, version 2.17.9 (August 2026) ### 1.1 Current Release | Item | Details | |---|---| | Current release | **2.17.9** (Stable), for the CoolMax SRX and SRX-R | | How to check | AERL Link: the unit's card and its STATUS tab. AERL Cloud: the FW Version column on the Service page. | | How to update | AERL Link over USB, or AERL Cloud through a Nexus gateway | ### 1.2 Version 2.17.9 (August 2026) The current Stable release for the SRX and SRX-R, offered to units of hardware revision 108 and later. It has the same functions as 2.9.4 (below), and brings them to the SRX-R. It is numbered 2.17.9 so that every unit on an earlier release can take it as an update. SRX units of hardware revision 107 stay on 2.9.4. ### 1.3 Version 2.9.4 (November 2025) Released for the CoolMax SRX. - Charging rides through a sudden short drop in solar input, such as a passing cloud, instead of shutting down. - Improved maximum power point tracking. - Improved reliability. ### 1.4 Version 2.8.4, SRX-R (October 2025) Released for the CoolMax SRX-R. Also includes the changes first released in 2.6.6 (SRX, November 2024), 2.6.7 (SRX and SRX-R, December 2024) and 2.6.9 (SRX-R, March 2025). - **Earth-fault detection** measures the insulation resistance directly, for more reliable detection. Fixes a unit that could stay stopped after an earth-fault check. - **Alarm buzzer** turns off after 30 minutes. - **Charge stages:** charge-stage changes are timed, so a unit no longer switches back and forth between stages. Fixes re-bulk. - **Start-up:** fixes start-up and power ramps that could stall; handles a failed pre-charge safely. - Detects whether the unit is supplied from a solar array or a DC power supply. - Settings can be changed over CAN bus, so a unit's charge profile can be set from AERL Cloud through a Nexus gateway. - Improved fan control, and better handling of a failed fan or temperature sensor. - Lower electrical noise. - Improved reliability. ### 1.5 Version 2.5.3 (September 2024) - Improved maximum power point tracking between charge states. - Improved reliability. ### 1.6 Version 2.5.1 (September 2024) - Faster over-current protection. - Improved reliability. ### 1.7 Version 2.4.2 (June 2024) Includes the changes made since 2.0.3: - Earth-fault checks are synchronised between units on the same CAN bus, so parallel units do not disturb each other's measurement. - Support for Pylontech batteries over CAN; the unit stops charging on a battery alarm. - The LED flashes green while the unit is controlled over CAN. - The CAN ID is kept through a restart, and units on a shared bus resolve duplicate IDs. - Slow start-up ramp for lead-acid batteries. - Units on a shared DC bus synchronise their converters. - Higher input current, and a wider range of charge voltages. ### 1.8 Version 2.0.3 (February 2024) - Earth-fault testing of the battery negative is back. - Faster earth-leakage measurement. ### 1.9 Version 2.0.2 (February 2024) - Earth-fault testing coordinated between parallel units over CAN. - The converter shuts down if its temperature sensor stops responding. ### 1.10 Version 2.0.1 (February 2024) - **Earth-fault trip fixed at 50 kΩ.** The unit reports an earth fault when the insulation resistance of a monitored pole falls below 50 kΩ. There is no sensitivity to set. - Fixes a fault that could make the unit stop responding. - Improved handling of an input over-voltage alarm. - The LED shows when a firmware update is in progress. - Improved reliability. ## 02 EarthGuard EG-600 — Current release, version 2.2.1 (November 2025) ### 2.1 Current Release | Item | Details | |---|---| | Current release | **2.2.1**, for the EarthGuard EG-600 | | How to check | AERL Link: the unit's card and its STATUS tab | | How to update | AERL Link over USB-C | ### 2.2 Version 2.2.1 (November 2025) - Fixes unexpected restarts during earth-fault measurement. - Includes 2.2.0: improved insulation measurement on systems with capacitance between the DC wiring and earth. - Includes 2.1.2: corrected voltage measurement range. - Includes 2.1.1: steadier insulation readings (filtering and averaging of the measurements). ## 03 Nexus Gateway Software — How it is released ### 3.1 How It Is Released Nexus gateways update their own software automatically (AERL Firmware Update Guide, Nexus Gateway and HMI-10). The version is shown on the gateway's page in AERL Cloud. For the changes in a particular version, contact AERL support. ## 04 AERL Link — Current release, version 1.0.4.20 (October 2026) ### 4.1 Current Release AERL Link updates itself: each time it starts, it checks for a newer release and offers to install it. The version is shown on AERL Link's SETTINGS page. Download it from **aerl.com.au/professionals**. ### 4.2 Version 1.0.4.20 (October 2026) - **Help:** the SRX and SRX-R user manual is inside AERL Link, searchable; the **?** beside a setting opens it at the right section. Two help tours, on a demo SRX. - **Settings:** every Apply lists the changes, *before → after* , before anything is sent. **Undo** and **Redo** step through a unit's earlier settings. - **Support bundle:** saves a zip of AERL Link's logs and each unit's settings, settings history and event log, to email to AERL support. - **Firmware:** the firmware list comes from AERL Cloud; update offers show the release notes. Stable and Beta firmware, and a firmware lock that holds a site at a tested version. - **Status:** an explanation behind a **?** for status codes an installer can act on. - Demo units can import and export settings files. - More reliable calibration, firmware updates and USB communication. ### 4.3 Versions 1.0.4.17 to 1.0.4.19 (September 2026) - **CAN role** on the COMMS tab, locked by a password from AERL support. - The DEVICES page shows connected units straight away. - Every status code has a description; explanations for codes −380, −1103, −1160 and −1162. - EarthGuard: the faulted pole is named, and the insulation at fault level is shown in kΩ. Settings changes are saved reliably. - Calibration is refused while the battery voltage is still moving. - Settings files are checked before they are used; AERL Link asks before a file turns Blackstart Guard on. - A unit that was never set up gets a complete charge profile. - The low-temperature cutoff shown matches what the firmware enforces. - More reliable firmware updates, and units moved or swapped between USB ports are found again. ### 4.4 Version 1.0.4.16 (August 2026) - Calibration switches the unit's output off while it measures, and switches it back on afterwards. It is refused when no battery is connected. - The firmware update offer waits until a calibration has finished; damaged downloaded firmware is never offered. - The COMMS tab is hidden on firmware that cannot store the comms settings. - AERL Link stays on the unit's page while it restarts after an update. - More reliable USB communication. ### 4.5 Version 1.0.4.15 (June 2026) - Fixes the SRX calibration accuracy check. ### 4.6 Version 1.0.4.14 (June 2026) - **Output Enabled** setting back on the OUTPUT tab. - Firmware updates recover better from a disconnection. - More reliable communication on noisy USB connections. ### 4.7 Version 1.0.4.13 (June 2026) - EG-600: a note that the circuit voltage reading on some earlier hardware can be in error. ### 4.8 Version 1.0.4.12 (June 2026) - Fixes the Battery Voltage setting showing the wrong value after it was read back from the unit. ### 4.9 Version 1.0.4.11 (May 2026) - First release published from aerl.com.au. Earlier installations do not update to it by themselves: install it from the download page. - Demo units for each product. - Ground fault settings for older SRX firmware. ### 4.10 Change Log | Revision | Date | Change | |---|---|---| | 1.0.0 | 11 / 2026 | First issue. | If you have any questions or need support, contact AERL. Sincerely, The AERL Team **AERL Pty Ltd** · 1/75 Bluestone Circuit, Seventeen Mile Rocks QLD 4073 · 1800 950 865 · support@aerl.com.au · aerl.com.au ![AERL](https://www.aerl.com.au/docs/_assets/assets/logos/aerl-logo.svg) Australian Energy Research Laboratories ### Address 1/75 Bluestone Circuit Seventeen Mile Rocks QLD 4073 Australia ### Contact [sales@aerl.com.au](mailto:sales@aerl.com.au) [support@aerl.com.au](mailto:support@aerl.com.au) aerl.com.au Phone **1800 950 865** © 2026 AERL Pty Ltd AERL Firmware and Software · Release Notes **Rev 1.0.0**