Earth Notes: Saving Electricity and Gas (2023)

Updated 2023-12-05 08:27 GMT.
By Damon Hart-Davis.
Meter readings and energy-saving notes for dual fuel use at home in 2023. #4kWhDHWClub
20230129 heatBatTarget
2023 PV Output
Meter readings and analysis of our electricity and gas carbon footprint at home in 2023.


See the daily PV generation logs for 2023 as .csv and .png chart.

2023-05-24: Clock Skew

Note the following snippet from E2023.csv, in particular the 24th to the 26th.


At some point the SunnyBeam clock was maybe 12h out so I had to manually reset it (on the 26th). I suspect that this is the result. This was probably caused by the RPi power-supply failure on the 12th.

2023 Fuel Consumption Data
MonthConsumed kWh (/d)Generated -kWh (/d)Consumed kWh (/d) PeriodNotes
2023-01 312 (10.1/d) -71 (-2.3/d) 451 (14.5/d) 20221231T18:04Z to 20230131T18:26Z (31d) Meter readings: electricity generation 70.5kWh, export 1.0kWh, import 242.6kWh (thus net consumption (I+G-E) 312.1kWh, self consumption ((N-I)/N) 22%); gas ~40.6m^3 (so 451kWh @ 11.1kWh/m^3).
Lots of wind power on the grid and thus low-carbon-intensity top-up to the heat battery has covered very roughly half (~2kWh/d) our DHW.
Generation from the first solar PV sub-array passed 41MWh.
Bathroom MHRV running well.
The Enphase emailed monthly report for January (triggered 2023-07-01) says: produced (generated) 71.0kWh (max 4.5kWh on the 30th), consumed 298.6kWh (max 24.9kWh on the 29th), grid energy imported 243.3kWh and exported 0.3kWh, grid dependence 81% (min 51% on the 20th).
HDD12=194 vs 204 last January.
2023-02 274 (9.8/d) -124 (-4.4/d) 346 (12.4/d) 20230131T18:26Z to 20230228T17:00Z (28d) Meter readings: electricity generation 124.3kWh, export 4.4kWh, import 154.2kWh (thus net consumption (I+G-E) 274.1kWh, self consumption ((N-I)/N) 44%); gas ~31.2m^3 (so 346kWh @ 11.1kWh/m^3).
The Enphase emailed monthly report for February (triggered 2023-07-01) says: produced (generated) 124.6kWh (max 7.3kWh on the 15th), consumed 253.0kWh (max 15.1kWh on the 24th), grid energy imported 150.4kWh and exported 3.4kWh, grid dependence 59% (min 15% on the 7th).
HDD12=145 vs 116 last February.
2023-03 314 (10.1/d) -217 (-7.0/d) 230 (7.4/d) 20230228T17:00Z to 20230331T17:15Z (31d) Meter readings: electricity generation 217.0kWh, export 25.2kWh, import 122.6kWh (thus net consumption (I+G-E) 314.4kWh, self consumption ((N-I)/N) 61%); gas ~20.7m^3 (so 230kWh @ 11.1kWh/m^3).
2023-03-15: the weather and forecast warmed to the point (~12°C during the day) where I turned the heating off (~21:00Z) to save gas/money/carbon.
The Enphase emailed monthly report for March (received 2023-04-12) says: produced (generated) 215.4kWh (max 14.9kWh on the 27th), consumed 290.5kWh (max 14.5kWh on the 23rd), grid energy imported 122.4kWh and exported 22.6kWh, grid dependence 42% (min 14% on the 27th).
HDD12=129 vs 113 last March.
2023-04 287 (9.4/d) -426 (-14.2/d) 15 (0.5/d) 20230331T17:15Z to 20230430T19:04Z (30d) Meter readings: electricity generation 426.0kWh, export 179.3kWh, import 34.2kWh (thus net consumption (I+G-E) 286.9kWh, self consumption ((N-I)/N) 88%); gas ~1.4m^3 (so 15kWh @ 11.1kWh/m^3).
Exports passed 39MWh.
Most of the family was away two weekends in April, which reduced consumption!
The Enphase emailed monthly report for April (received 2023-05-11) says: produced (generated) 428.2kWh (max 21.7kWh on the 4th), consumed 257.5kWh (max 14.2kWh on the 23rd), grid energy imported 28.4kWh and exported 176.3kWh, grid dependence 11% (min 1% on the 15th).
HDD12=87 vs 75 last April.
2023-05 331 (10.7/d) -573 (-18.5/d) 17 (0.6/d) 20230430T19:04Z to 20230531T17:22Z (31d) Meter readings: electricity generation 573.2kWh, export 267.4kWh, import 24.7kWh (thus net consumption (I+G-E) 330.5kWh, self consumption ((N-I)/N) 93%); gas ~1.5m^3 (so 17kWh @ 11.1kWh/m^3).
Generation from the first PV array passed 42MWh.
The Enphase emailed monthly report for May (received 2023-06-11) says: produced (generated) 576.9kWh (max 28.6kWh on the 27th), consumed 313.1kWh (max 16.2kWh on the 14th), grid energy imported 20.6kWh and exported 264.3kWh, grid dependence 7% (min 1% on the 27th).
HDD12=20 vs 14 last May.
2023-06 285 (9.5/d) -656 (-21.9/d) 3 (0.1/d) 20230531T17:22Z to 20230630T17:20Z (30d) Meter readings: electricity generation 656.1kWh, export 382.1kWh, import 10.6kWh (thus net consumption (I+G-E) 284.6kWh, self consumption ((N-I)/N) 96%); gas ~0.3m^3 (so 3kWh @ 11.1kWh/m^3).
Gas boiler turned off entirely since 10th as an experiment: no problems. (As insurance, the Thermino has been set to a minimum 30% level fill!)
The Enphase emailed monthly report for June (triggered 2023-07-01) says: produced (generated) 659.3kWh (max 29.2kWh on the 4th), consumed 271.0kWh (max 14.1kWh on the 10th), grid energy imported 7.7kWh and exported 378.8kWh, grid dependence 3% (min 1% on the 2nd).
HDD12=3 vs 3 last June.
2023-07 275 (8.9/d) -527 (-17.0/d) 0 (0/d) 20230630T17:20Z to 20230731T17:16Z (31d) Meter readings: electricity generation 526.6kWh, export 274.7kWh, import 22.6kWh (thus net consumption (I+G-E) 284.6kWh, self consumption ((N-I)/N) 92%); gas ~0m^3 (so 0kWh @ 11.1kWh/m^3).
A few days' holiday reduced demand a little.
Exports passed 40MWh.
Gas boiler still turned off, thus zero gas consumption (hurrah)! Made small tweaks to Thermino control code (given the 30% 'insurance') so as to reduce spurious top-ups from mains during fast run-off, ie typically baths.
The Enphase emailed monthly report for July (triggered 2023-08-01) says: produced (generated) 529.6kWh (max 28.4kWh on the 7th), consumed 258.9kWh (max 15.2kWh on the 15th), grid energy imported 18.2kWh and exported 270.5kWh, grid dependence 7% (min 1% on the 25th).
HDD12=0 vs 0 last July.
2023-08 214 (6.5/d) -521 (-15.7/d) 0 (0/d) 20230731T17:16Z to 20230902T21:43Z (33d) Meter readings: electricity generation 520.5kWh, export 316.4kWh, import 10.2kWh (thus net consumption (I+G-E) 214.3kWh, self consumption ((N-I)/N) 95%); gas ~0m^3 (so 0kWh @ 11.1kWh/m^3).
Holiday reduced demand a little, and delayed the end-of-month reading.
Gas boiler still turned off, thus zero gas consumption (hurrah)!
Ecotricity is projecting ~1.1MWh/year electricity import, and ~1.8MWh/year gas.
The Enphase emailed monthly report for August (triggered 2023-09-01) says: produced (generated) 498.6kWh (max 24.6kWh on the 9th), consumed 190.8kWh (max 14.5kWh on the 16th), grid energy imported 7.8kWh and exported 297.3kWh, grid dependence 4% (min 1% on the 29th).
HDD12=1 vs 0 last August.
2023-09 276 (9.9/d) -340 (-12.1/d) 10 (0.4/d) 20230902T21:43Z to 20230930T10:44Z (28d) Meter readings: electricity generation 339.5kWh, export 108.5kWh, import 44.9kWh (thus net consumption (I+G-E) 275.9kWh, self consumption ((N-I)/N) 84%); gas ~0.9m^3 (so 9.9kWh @ 11.1kWh/m^3).
Gas boiler back on for DHW (fallback) on 11th; consumption back to ~0.5kWh/d.
The Enphase emailed monthly report for September (triggered 2023-10-01) says: produced (generated) 371.5kWh (max 19.7kWh on the 3rd), consumed 266.1kWh (max 13.1kWh on the 14th), grid energy imported 41.1kWh and exported 124.6kWh, grid dependence 15% (min 0% on the 30th).
HDD12=1 vs 13 last September.
2023-10 290 (9.4/d) -208 (-6.7/d) 7 (0.2/d) 20230930T10:44Z to 20231031T17:00Z (31d) Meter readings: electricity generation 207.5kWh, export 35.9kWh, import 118.3kWh (thus net consumption (I+G-E) 289.9kWh, self consumption ((N-I)/N) 59%); gas ~0.6m^3 (so 6.7kWh @ 11.1kWh/m^3).
The Enphase emailed monthly report for October (triggered 2023-11-01) says: produced (generated) 201.6kWh (max 11.4kWh on the 8th), consumed 273.2kWh (max 17.0kWh on the 13th), grid energy imported 120.2kWh and exported 29.3kWh, grid dependence 44% (min 6% on the 1st).
HDD12=28 vs 17 last October.
2023-11 328 (10.9/d) -77 (-2.6/d) 35 (1.2/d) 20231031T17:00Z to 20231130T17:56Z (30d) Meter readings: electricity generation 77.2kWh, export 1.5kWh, import 252.7kWh (thus net consumption (I+G-E) 328.4kWh, self consumption ((N-I)/N) 23%); gas ~3.1m^3 (so 34.5kWh @ 11.1kWh/m^3).
The heating stayed off this month, though at the end external temperatures were around freezing and internal ~14°C.
Ecotricity is projecting ~1.2MWh/year electricity import, and ~1.7MWh/year gas, circa £860, as of the bill covering November. This bill >£100.
The Enphase emailed monthly report for November (triggered 2023-12-01) says: produced (generated) 78.1kWh (max 4.6kWh on the 1st), consumed 311.5kWh (max 23.1kWh on the 18th), grid energy imported 250.1kWh and exported 0.8kWh, grid dependence 80% (min 62% on the 29th).
HDD12=114 vs 65 last November.
~1239 words.