No WiFi? No problem: you can also monitor your solar panels without an internet connection.
Alternative ways of monitoring
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Via the display on the inverter itself
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Bluetooth connection to a smartphone or tablet
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Offline data storage: some inverters log data locally that can be read later
Limitations without WiFi
Conclusion
Monitoring solar panels without WiFi is possible, but less convenient than online monitoring. For maximum ease of use, WiFi remains recommended.