Grid-Scale BESS Degradation Tracker
Log capacity tests for a grid-scale bess and get the fade trend + end-of-life forecast. Data stays in your browser.
A single SoH reading is a snapshot; a trend is a maintenance plan. Grid batteries cycle daily for arbitrage and ancillary services — at 1.5 cycles/day an LFP bank burns through ~550 EFC a year, so augmentation planning starts on day one. Log each capacity test here — the tracker fits a line through your readings, reports %/yr fade and forecasts the year the pack hits retirement. Records persist in your browser only.
No records yet — log your first capacity test. Data stays in this browser (localStorage); nothing is uploaded.
Trend = least-squares fit through your test points. Test on a fixed schedule (quarterly for heavy cycling, yearly otherwise) at the same temperature and discharge rate, or the trend will chase measurement noise.
Engineering estimate from published standards and typical equipment data. Site conditions, equipment datasheets and measured data govern the real result — confirm with a qualified engineer.
Use the free Grid-Scale BESS Degradation Tracker online — Log capacity tests for a grid-scale bess and get the fade trend + end-of-life forecast. Data stays in your browser. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About Grid-Scale BESS Degradation Tracker
A single SoH reading is a snapshot; a trend is a maintenance plan. Grid batteries cycle daily for arbitrage and ancillary services — at 1.5 cycles/day an LFP bank burns through ~550 EFC a year, so augmentation planning starts on day one. Log each capacity test here — the tracker fits a line through your readings, reports %/yr fade and forecasts the year the pack hits retirement. Records persist in your browser only.
How to use Grid-Scale BESS Degradation Tracker
- 1After each capacity test, log the date and measured SoH.
- 2Add at least two tests to unlock the fade-rate trend.
- 3Watch the %/yr figure and the forecast year it crosses your retirement threshold.
Why use Grid-Scale BESS Degradation Tracker?
- ✓Least-squares trend through your actual test history — data, not vibes
- ✓End-of-life forecast updates with every logged test
- ✓Records persist in your browser; nothing uploads anywhere
- ✓Consistent-method prompts keep the trend meaningful
Frequently asked questions
Why track battery SoH over time instead of single readings?+
One reading tells you where you are; a trend tells you where you'll be and when to budget. Fade rates also expose problems: a stable 2%/yr that jumps to 6% flags a thermal issue, a failing cell or a duty change — visible months before failure.
How many data points make a reliable trend?+
Three or more spaced tests (quarterly or semi-annual) give a usable line; five make it solid. Keep the method constant — same discharge rate, same temperature window, same rest period — or the noise will swamp the signal the regression is fitting.
Where is my logged data stored?+
In your browser's localStorage on this device only — nothing is uploaded, no account exists. Export or photograph the table before clearing browser data or switching devices; for shared O&M records, mirror entries into your maintenance system.
What fade rate is normal?+
Healthy stationary Li-ion: 1.5–3%/yr. Hot climates or heavy cycling: 3–5%. Lead-acid in float: 4–7%. Above those bands, look for heat, overcharge, or a diverging weak cell — and shorten the test interval until the cause is found.
Embed Grid-Scale BESS Degradation Tracker on your website
Want Grid-Scale BESS Degradation Trackeron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/grid-bess-battery-degradation-tracker" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Grid-Scale BESS Degradation Tracker — ToolJolt" loading="lazy"></iframe>Related tools
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