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What happens if Sense loses Wi-Fi connection?

If Sense is unable to reconnect, the monitor can hold at least six hours of device-specific, per-second data. After that space is exhausted, the data may be lost, but the monitor will try to preserve per-minute data for whole home consumption and solar production for a minimum of three months. 

Note that in cases where multiple power outages occur while Sense is disconnected from Wi-Fi, further data loss can occur.