I have replaced all 52 x 50W halogens (mostly MR11 with a few GU-10) with decent 5W LED GU-10s. Painful job - all 12V halogen transformers removed and all fittings changed to GU-10.
We have three-phase to the property, have a couple of outbuildings and use a ground source heat pump, so initially I wanted to see what the utility split &heat pump was doing.
As an engineer, I opted for the Emporia Vue2 system which is cheap and extraordinarily flexible - it handles three-phase pretty well however as it's new to the UK, it's setup is still fairly USA-centric. The architecture of the system though makes sense and the whole setup cost me about £200 if you include cabinets and the special "wide-mouthed" CTs (current transformers) that you need for clamp utility tails.
We use a lot of electricity - last year about 17,000kWh, so potentially we can save a lot of money. It's been a really interesting exercise - at the moment, we've saved about 40% of our usage. The house is a large eco-House we built about 15 years ago, but the outbuildings (Office/Cottage/workshops/sauna!) are power-hungry.
I made a small 3-phase consumer unit to supply & contain the Vue2 - it connects via WiFi to the house system. The Vue2 has capability for monitoring up to 16 circuits (other than the utility feed, which are another 3) and in this setup up only using 6 currently. Utility monitoring includes phase, voltage & power factor.
I've gone after the "low hanging fruit" first - the halogens, PCs that really don't need to be on all the time, having the heat pump serviced and upgraded to the latest firmware etc. so that its CoP is the best it can be (it's the single biggest user of power).
There's a simple truism - the last 5% takes 90% of the effort... so do the obvious stuff first, including white goods (fridges/freezers etc.)
I also can't over-emphasize the importance of insulation to prevent energy loss. Sensible hot water temperatures, running stuff between 00:00 & 07:00 (if you have Economy 7), turning stuff off when not needed etc.
Just noticed that our two hot water/heating circulation pumps consume nearly 90W between them and there's a third one used by the GSHP for circulation in the underground loops.
Also, we have a Klargester septic tank has continuously rotating (24/7) disks in it, so about to add that to the monitoring list, but not too sure if there's anything we can do about it!
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