WEBVTT NOTE Transcript 2024-03-18 from FLAC by https://elvery.net/prototypes/transcribe/ on my MacBook Air M1 on maximum quality setting. NOTE Body lightly edited. 00:00.000 --> 00:02.000 StatsCast 00:02.000 --> 00:07.500 [Intro Music] 00:07.500 --> 00:17.500 Hi, I'm Damon Hart-Davis, and welcome to Earth Notes podcast on all things eco and green and efficient at home! 00:17.500 --> 00:23.000 31st December 2020 for stats from October to December. 00:23.000 --> 00:30.000 Turn-of-the-month update of home energy and related stats and poking at data from 16WW. 00:30.000 --> 00:40.000 This is a short episode and I will largely ignore the wider world except to note that even Covid didn't bring down carbon emissions enough to make a useful difference in 2020. 00:40.000 --> 00:45.000 We're going to have to work much harder at fixing the climate than some would like, but that isn't news. 00:45.000 --> 00:52.000 November was warm and our central heating didn't go on until 1st December. The start of November is more typical. 00:52.000 --> 01:03.000 I'm happy to report as a side note that the bats around 16WW are still busy well into November and even detectable from my study window on the Solstice in December. 01:03.000 --> 01:07.000 16WW load profile vs. typical. 01:07.000 --> 01:16.000 This time I'm looking at our electricity load profile at home at 16WW, i.e. how much electricity we use at each time of day. 01:16.000 --> 01:22.000 Most households on the GP grid are both on non-smart meters and also on all day tariff. 01:22.000 --> 01:33.000 So even though the underlying wholesale price of electricity can vary greatly, users pay a flat rate and remain oblivious and their retail suppliers don't know how much they've actually used when. 01:33.000 --> 01:41.000 To that end there is profiling, where the typical load profile or load curve of different types of electricity consumers are measured. 01:41.000 --> 01:50.000 The first couple of profiles in GB are for domestic customers on a completely flat or unrestricted tariff and those on Economy 7. 01:50.000 --> 01:59.000 Retailers have to pay for wholesale electricity as if their customers on non-smart meters were all consuming in line with their profile. 01:59.000 --> 02:08.000 I'm interested to see how much we differ from the standard profile if at all given our solar PV, Enphase AC battery and various other tweaks. 02:08.000 --> 02:19.000 As shownotes have a more detailed analysis, but the upshot is that in winter 16WW gross consumption, ignoring PV and battery, is not wildly different to the typical home. 02:19.000 --> 02:25.000 In particular consumption is lowest at night and peaks in the evening for cooking for our evening meal. 02:25.000 --> 02:37.000 But our consumption at night is much lower than usual given all our efforts to kill vampire loads and our evening peak is maybe higher than usual because our cooking is all electric, induction hob and fan electric oven. 02:37.000 --> 02:41.000 That is gross consumption, as if we had no PV or battery. 02:41.000 --> 02:47.000 But looking at what actually flows from and to the grid, the difference from typical is much bigger. 02:47.000 --> 02:56.000 For example, imports from the grid drop to zero around noon on average, even in December, in part because PV can directly carry much of the load then. 02:56.000 --> 02:59.000 Sometimes it cannot and we import. 02:59.000 --> 03:05.000 Sometimes PV is more than enough and we charge the battery or even export or spill to the grid. 03:05.000 --> 03:09.000 And December is the time of year with the lowest PV generation. 03:09.000 --> 03:16.000 It's also clear that we are shaving about 10% off our peak demand in the 4pm to 7pm slot with the battery. 03:16.000 --> 03:21.000 Not running appliances such as the dishwasher and the central heating then will also be helping. 03:21.000 --> 03:32.000 Note that even if our battery storage was doubled, we likely wouldn't shave off 20% at peak time since there is not that extra energy available from the solar PV to charge the storage. 03:32.000 --> 03:35.000 I'm happy that these efforts are probably doing some good. 03:35.000 --> 03:48.000 I just took a quick test at climatehero.me which reckoned that each adult at 16WW had a footprint not far off from a climate friendly 2 tons of CO2 per year, which is good. 03:48.000 --> 03:54.000 If everybody was below 2 tons of CO2 per year, we could immediately avoid the threat of climate change. 03:54.000 --> 04:00.000 It was suggested that neutralising our whole remaining footprint only costs $3 per month. 04:00.000 --> 04:08.000 I put much more than that into working directly on climate fixes such as Radbot, so I passed on this carbon offset offer. 04:09.000 --> 04:21.000 There's more on my Earth Notes Web site at Earth.Org.UK.