WB-UPS v.3 firmware changelog

Overview

Device firmware can be updated over Modbus; see the instructions.
This page lists changes since the beginning of 2022. Earlier changes are in Firmware Changelog.

Changelog

1.4.1 (01.07.2026)

Fixed output-voltage setpoint becoming stuck after an input-voltage dip: ERRWBUPS30002
Fixed Modbus issues:

1.4.0 (23.06.2026) — available in testing

Added smoothing and monotonic display of charge level.
Added raw charge-level register.
100% charge is now displayed only when battery state is Fully charged.
Fixed configuration persistence after restart.
Improved Fast Modbus arbitration timing stability.

1.3.2 (29.05.2026)

Added FlashFS diagnostic service registers.
Optimized stack usage when requesting many registers.
Fixed calibration-function bug.
Fixed event loss when two devices on the same bus transmit events simultaneously.

1.3.1 (25.03.2026)

Optimised filesystem operation
Optimised power-loss handling

1.3.0 (25.12.2025)

Added device batch number registers

1.2.0 (12.12.2025)

Added service register to disable the front-panel button LED for more accurate calibration
Added stack and RAM monitoring service registers
Added a service register for the last MCU reset cause
Added a firmware update counter service register
Added FlashFS diagnostic service registers
Improved MCU supply voltage measurement accuracy on new devices

1.1.0 (02.09.2025)

Added support for parallel connection of multiple WB-UPS modules
Added charging shutdown if the battery is discharging despite input power being present, for example when output voltage exceeds input voltage and the load is actually battery-powered.
Added configuration-reset register

1.0.2 (16.07.2025)

Added signature for a new battery model with different internal resistance

1.0.1 (03.07.2025)

Expanded ADC near-zero suppression range

1.0.0 (01.06.2025)

First firmware version