grid spy: there are some periods where total load was negative despite no PV or other onsite generation
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This was noticed with hot water as -1kw for a few days instead of what was usually +2kw. We consider this was probably a gridspy error due to the current clamp being set to a different phase temporarily. It can be rectified it by multiplying any negative values by -2. (h/t Jefferson)
Note that this correction has not been implemented in the data. The user should deal with this as they see fit.
It is also visible in Hot Water (c 35% of observations, multiple houses), Lighting (c 3% of observations, mostly in 1 house) and Heat Pump (c 3%, mostly in 1 house) circuits - and thus probably elsewhere
Update: new negative power & outlier analysis has been conducted - see https://cfsotago.github.io/GREENGridData/gridSpy1mOutliersReport_v1.0.html. It makes recommendations as to what to do. Simply multiplying by -2 may not be the right action in all cases!