· HeliKeep · Guides · 3 min read
How to Monitor Your EPEVER Charge Controller Remotely
Compare every option for remote monitoring your EPEVER Tracer — from the MT50 display to the eBox-WiFi to DIY ESP32 to Helikeep. Full comparison table included.
Your EPEVER Tracer charge controller is doing its job — converting solar power, charging your battery, managing your load output. But you can’t see what it’s doing unless you’re standing next to it, staring at blinking LEDs that tell you almost nothing.
This guide covers every way to monitor an EPEVER controller remotely, from the cheapest option to the best.
Option 1: EPEVER MT50 Display (~25)
The MT50 is a wired display that plugs into the same RJ45 port on your controller. It shows:
- Battery voltage and SOC
- PV voltage and current
- Load current
- Charging mode
- Settings menu for configuration
Pros: Cheap, easy to use, shows all the data you need. Cons: You have to be physically present. No remote access, no alerts, no historical data. It’s a local display only.
Best for: People who visit their installation daily.
Option 2: EPEVER eBox-WiFi (~40)
The eBox-WiFi plugs into the RS485 port and connects to your WiFi network. You use the EPEVER app on your phone to view data.
Pros: Remote access via phone app. Relatively cheap. Cons: The app is unreliable — frequent disconnections, no web dashboard, no historical charts, no alerts, no automation. Many users report the eBox going offline and never reconnecting without a power cycle.
Best for: People who want basic remote viewing and can tolerate a flaky app.
Option 3: DIY with ESP32 + Home Assistant
Build your own monitoring system using an ESP32 microcontroller, an RS485 module, and ESPHome. Publish data to Home Assistant via MQTT.
Pros: Maximum flexibility, full historical data, automations, alerts, integrates with your smart home. Cons: Requires significant technical knowledge — soldering, ESPHome configuration, Home Assistant setup, MQTT broker, networking. Debugging Modbus communication issues is not for beginners. No support if something breaks.
Best for: Experienced makers and Home Assistant users who enjoy the build process.
Option 4: Helikeep (~75)
Helikeep is a pre-built, pre-configured device that plugs into your EPEVER controller’s RS485 port. Setup takes 5 minutes with a phone. You get:
- Remote monitoring via web dashboard (works on any device with a browser)
- Local web interface (works without internet)
- Automatic battery protection — cuts load when voltage drops too low
- Battery overnight estimate — “Your battery will last until 6:42 AM”
- Smart alerts — email and webhook notifications (PRO)
- Historical charts — 30 days free, 1 year with PRO
- Automatic firmware updates — always up to date, no manual flashing
Pros: Plug-and-play, no technical knowledge needed, automatic battery protection, reliable cloud dashboard. Cons: More expensive than eBox-WiFi. Requires WiFi at the installation site.
Best for: Anyone who wants reliable monitoring and battery protection without the DIY complexity.
Comparison Table
| Feature | MT50 (25) | eBox-WiFi (40) | DIY ESP32 (15-30) | Helikeep (75) |
|---|---|---|---|---|
| Remote access | No | Yes (app) | Yes (HA) | Yes (web) |
| Local display | Yes | No | Optional | Yes (web) |
| Historical data | No | No | Unlimited (HA) | 30d free / 1yr PRO |
| Alerts | No | No | Yes (HA) | Yes (PRO) |
| Battery protection | No | No | DIY possible | Built-in |
| Overnight estimate | No | No | DIY possible | Built-in |
| Setup difficulty | Easy | Easy | Hard | Easy |
| Reliability | High | Low | Depends on build | High |
Which Should You Choose?
- You visit daily and just want to see numbers: MT50
- You want remote viewing and don’t mind a flaky app: eBox-WiFi
- You’re a Home Assistant user and enjoy building things: DIY ESP32
- You want it to just work with no hassle: Helikeep
Ready to Monitor Your EPEVER?
Learn more about Helikeep and see how it works with your EPEVER charge controller.