I’ve just spotted this Redit post, a Raspberry Pi with am early version of our RFM2Pi receiver has been running Emoncms non-stop for 10 years! 
Can anyone beat this?!
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Not ten years but nearing eight. Local Emoncms/MySolar running on a Raspberry Pi 3B. Inputs from an Enphase Envoy gateway. Thought the SD card would have died by now.
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Got my first emonpi in 2018 which is still going strong on the original Pi 2B.
So many emonTX, heat pump HAT, heat meter, SDM120, DS18B20 and emonTH later. 
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Nice! We’ve done a lot of work on our emonSD software stack to make the SD card last as long as possible e.g log to RAM logs, read-only partition etc.
Mine has been running since 11th July 2017, originally as an EmonBase with an EmonTX3, but using custom integration with an Enphase Envoy since August 2020.
I’ve been through one SD card in that time, but still going strong on the second one.
@glyn.hudson I’m still running my original Kickstarter emonpi. It went live logging to the local SD card emoncms on 5th June 2015 and logging to emoncms.org since 11th June 2015. I did change the feeds around in the first year - but have continuous PV and house energy and internal temperature data since October 2015.
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