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Energy monitoring using Raspberry Pi, looking for advice regarding data storage
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JVR:
Something to keep in mind, if you want to use this data w.r.t the government, is calibration. If they want to be dicks about it, they will tell you that your measurement equipment is uncalibrated, and therefore useless.

If you want to have legitimate data, buy a DMM with a cal certificate, and read the measurements off it. Also, the point of the house that you will be measuring will impact the measurement, but I assume you want to measure at the point of supply.
JeanF:
Yes, you are right. They will indeed tell me that they don't trust my measurements. Usually, they send someone to your house to install a logger themselves; if they can confirm the problem, they are committed to correcting it, and if they can't, then you have to pay a penalty. The sole goal of this project is to be better informed myself about what's really going on.

Whether they would trust me if I had a calibrated meter is another story. They would probably insist to send a tech anyway; they are notorious for being fussy about the procedure. I can't really blame them for that, it must be a challenge to manage ~30M customers anyway...

Yes, I will be measuring right at the point of supply indeed :)

As a general question, what are the options to get a cal certificate? (I've never done it). I know that the usual big distributors do it, but I've no idea about the price (often they say "contact us with your enquiry...", I won't waste their time with that at this point, as I'm not really interested). Are there other ways?
cdev:
I just wanted to say that you should also monitor temperature in the home since it is important. Even if the temperature in that area rarely if ever goes below freezing once in a very great while it may and then you will want to prevent your pipes from freezing, that is very important. (It even freezes solid in San Francisco once in a great while, thats a very maritime climate.)

Climate is less predictable now so since you are setting up this logging capability, best to have it have all the basics since its not very difficult once you have built it. Make sure you can also text message yourself and email yourself if any of the parameters are not within limits.

Also, you should save your data to a real hard drive as well as flash because flash wears out if you do many writes. You can store your writes and make some period's log writes all at once at say, (insert appropriate interval) to reduce the total number of writes. 

Don't rely on the network being there to save your data. Also, you should have a battery backup large enough to last several days.
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