Please add the minimum-voltage and maximum-voltage module IDs as columns in the VRM data download (CSV/XLSX), alongside the cell-voltage values that are already exported.
What’s happening now: In the Battery Monitor Widget, VRM displays the minimum and maximum cell voltages encountered, each with an ID. On my system — a Cerbo GX with a 7-module Pylontech bank — these IDs show as 101–107. They are not individual cell positions but the battery module addresses: the ID tells you which module in the string currently holds the lowest / highest cell.
Why this is genuinely useful: It’s a powerful, non-invasive way to locate weak or failing modules. By watching which module ID repeatedly produces the minimum voltage under discharge load, and the maximum voltage during charge, you can identify modules with degraded or high-resistance cells — without opening anything or connecting the manufacturer’s console software. In my case it cleanly flagged the bad modules: they were consistently the ones diverging under current, while the healthy modules never appeared in the min/max fields at all.
The gap: Those module IDs are shown live in the widget, but they are not included in the downloadable CSV/XLSX. The export contains Minimum cell voltage and Maximum cell voltage (the values), plus the Cell Imbalance and High cell voltage alarm flags — but not the module IDs the values came from. So the most useful part for offline diagnosis — which module is responsible — is lost the moment you analyse the data outside VRM or try to track the pattern across a full charge/discharge cycle.
I verified this on a recent VRM (beta) export dated 21 June 2026 — the module IDs are still absent, so this isn’t fixed in the current beta.
Request, concretely: add two columns to the export — “minimum cell voltage module ID” and “maximum cell voltage module ID” — next to the existing min/max cell-voltage values.
Secondary suggestion: relabelling the widget field from “cell” to “module” (or “module / cell”) would avoid the natural assumption that these are individual cell IDs.
Thanks for considering this.