Since switching to three phase my consumption has rocketed to 25,000KWH per annum, despite no significant additional load.

Question

We moved to three phase 3.5 years ago an anticipation of electric cars (which we don't have). 
 Since then We have been consuming around 25,000KWH pa according to the meter. 
 I've had a second meter fitted and it's validated these numbers. 
 When I switch all the RCDs off it stops, so clearly it's my side of the RCDs. 
 The house is around 10 years old with gas heating and gas cooking. We have low energy light bulbs. 
 The overnight consumption seems to show we're using 4+KWH per hour when we're asleep. 
 Load balancing was mentioned and I vaguely remember it from my degree but I don't believe that's it. 
 Large donation to charity if you can help me work this one out 
 thanks in advance 
 Adam

Sparkingchip · Answer

"Saving" one phase for an EV charger is actually ridiculous, as you can have a three phase charger which will be far more efficient. 
 You need to address the lack of balancing across the phases.

Chris Pearson · Answer

Adam, you are along the right lines already - "divide and conquer". You say that your consumption ceases when you turn off all three RCDs. Where are they please? 
 If you turn on each one separately, it ought to be reasonably obvious where the leccy is going. An hour's observation should be plenty to register 4 kW of power. 
 Then, having found the responsible RCD, you turn off all the MCBs and repeat the process with one on at a time. Start with the highest value. 
 As ever, photos always help us to understand the installation.

Since switching to three phase my consumption has rocketed to 25,000KWH per annum, despite no significant additional load.

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