Pylontech monitoring: the practical guide
Your inverter shows a percentage. Your Pylontech knows much more: every cell, its health, its temperature, its alarms. Here are the ways to get at that data, what is worth watching, and what "normal" looks like.
Four ways to monitor a Pylontech battery
| Method | What you see | From anywhere? | Effort |
|---|---|---|---|
| Inverter app | SOC, power — rarely cells or SOH | Usually | None |
| Pylontech BatteryView (Windows) | Everything, while a laptop is plugged in | No | Laptop + serial cable, on site |
| DIY (ESPHome, scripts on the console port) | What you program | If you build it | High: wiring, code, upkeep |
| PylonCheck (this site) | BMS data, cells, per battery, 3-year history, alerts, HA/MQTT | Yes | Two cables + WiFi; 39 € |
The values that matter, and what is normal
| Value | Typical healthy range (48 V LFP stack) | Worry when… |
|---|---|---|
| State of charge (SOC) | Reaches 100 % regularly | It never reaches 100 % for weeks — cells cannot balance |
| Cell spread (Δ max − min) | A few mV to ~30 mV at rest | It keeps growing, or stays above ~100 mV |
| State of Health (SOH) | Close to 100 %, slowly declining | One battery drops clearly below the others |
| Temperature | Room temperature, similar across modules | One module runs hotter, or the room falls near 0 °C |
| Cycles | Grows slowly, similar across modules | One module counts far more than the others |
| Alarms / protection | None | Any repeating protection flag |
Ranges are indicative for low-voltage Pylontech LFP stacks at rest. Always follow Pylontech's documentation and your installer for your exact model.
Three alerts that catch real problems
The box went silent
Power cut, WiFi, cable: you want to know within hours, not when you next open an app. PylonCheck emails you after 6 hours of silence.
The cells are drifting
A slow rise in the cell spread is the earliest sign of trouble — and usually just means the battery needs full charges. PylonCheck compares it to your pack's own normal.
Too hot, too empty
Your own SOC and temperature thresholds, pushed to your phone (Pushover) straight from the box.
A monitoring routine that takes one minute a week
- Glance at the charge curve. Did the battery reach 100 % at least once this week? If not, look at your inverter's charge settings.
- Look at the cell spread. Stable is good. A steady rise over weeks is worth a closer look.
- Compare the batteries. In a stack, modules should look alike. One module with a lower SOH, a higher temperature or more cycles is the one to watch.
- Keep the history. When something happens, being able to show three months of data to your installer or to Pylontech support changes everything.
That is exactly what PylonCheck was built for: the cloud dashboard shows all four at a glance, from anywhere, and the diagnostics page explains every value.
Questions
What is the best way to monitor a Pylontech battery remotely?
A device on the CONSOLE port that sends the BMS data to a cloud, so you see cells, SOH and temperatures from anywhere — not just the percentage your inverter shows. PylonCheck does this for 39 € with no subscription.
Can I monitor my Pylontech through the inverter only?
You see the state of charge and power, sometimes voltage. Most inverters do not show cell voltages, SOH or per-battery detail.
What is Pylontech BatteryView?
Pylontech's Windows service software. It reads everything through the console port but needs a laptop and a cable on site, so it is a diagnostic tool, not continuous monitoring.
Your battery, from anywhere. For 39 €.
Cloud dashboard, history, alerts, Home Assistant and MQTT included. No subscription.