Energy savings
AlphaESS inverter joined to Octopus half-hourly meter reads and tariff prices.
Solar & battery installed by Heatable
£150 off solar £75 off a battery £50 off your Octopus bill referral
2025
1 Jan 2025 – 31 Dec 2025
Updated 31st August 2026, 01:30
waiting on Octopus meter
Total benefit
£2,187.29
A lower bill plus export payments, over 13056 half-hours
Saved on bills
£1,224.05
Against no solar and no battery
Earned from export
£963.24
Export payments — real money in
Would have paid
£2,478.51
No panels, no battery
Actually paid
£1,254.46
Before export payments and standing charge
· £291.23 net of export
Solar generation
8,148 kWh
21.2% used at home,
6,422 kWh exported
Heating
3,751 kWh
£482.50 of the bill
· 37.8% of what the house used
· £1,066.64 without solar
Self-sufficiency
10.8%
9,917 kWh used, 8,847 kWh bought
EV charging
£248.12
1,867 kWh, excluded from savings
Battery round-trip
87.4%
4,662 kWh discharged
Where the benefit came from, by day
Solar and battery are separated by costing three worlds for every half hour — no panels and no battery, panels alone, then what actually happened — and taking the differences. A negative battery day is one that spent more storing energy than it gave back; it returns when the battery discharges. Export earnings sit inside the solar bar rather than beside it: the panels-alone world already sells its surplus, so that income is part of what solar is worth.
Solar (including export earnings)
Battery
View as table
| Day | Solar | Battery | Total | of which export | Solar kWh | Imported | Exported |
|---|---|---|---|---|---|---|---|
| Wed 31 Dec | £2.64 | £3.34 | £5.98 | £0.17 | 9.0 | 70.5 | 1.1 |
| Tue 30 Dec | £2.87 | £3.58 | £6.45 | £0.16 | 9.7 | 74.7 | 1.1 |
| Mon 29 Dec | £1.13 | £3.56 | £4.68 | £0.23 | 3.8 | 68.0 | 1.5 |
| Sun 28 Dec | £0.80 | £3.64 | £4.44 | £0.28 | 2.7 | 61.8 | 1.8 |
| Sat 27 Dec | £2.58 | £3.53 | £6.11 | £0.13 | 8.7 | 87.6 | 0.9 |
| Fri 26 Dec | £1.87 | £3.59 | £5.46 | £0.15 | 6.3 | 98.5 | 1.0 |
| Thu 25 Dec | £2.64 | £3.61 | £6.25 | £0.18 | 8.9 | 112.4 | 1.2 |
| Wed 24 Dec | £2.78 | £3.65 | £6.43 | £0.19 | 9.4 | 87.3 | 1.3 |
| Tue 23 Dec | £0.41 | £4.27 | £4.69 | £0.32 | 1.4 | 74.8 | 2.1 |
| Mon 22 Dec | £1.60 | £3.44 | £5.04 | £0.43 | 5.4 | 58.3 | 2.9 |
| Sun 21 Dec | £1.04 | £3.46 | £4.50 | £0.34 | 3.5 | 61.6 | 2.3 |
| Sat 20 Dec | £2.59 | £3.64 | £6.23 | £0.41 | 8.9 | 59.9 | 2.7 |
| Fri 19 Dec | £2.53 | £3.85 | £6.38 | £0.48 | 8.8 | 53.8 | 3.2 |
| Thu 18 Dec | £0.18 | £4.02 | £4.20 | £0.28 | 0.6 | 72.4 | 1.9 |
| Wed 17 Dec | £1.63 | £3.76 | £5.39 | £0.25 | 5.5 | 63.8 | 1.7 |
| Tue 16 Dec | £1.07 | £4.05 | £5.11 | £0.37 | 3.6 | 53.8 | 2.4 |
| Mon 15 Dec | £0.39 | £3.92 | £4.31 | £0.32 | 1.3 | 65.6 | 2.1 |
| Sun 14 Dec | £1.51 | £3.73 | £5.24 | £0.36 | 5.1 | 73.2 | 2.4 |
| Sat 13 Dec | £2.75 | £3.79 | £6.54 | £0.47 | 9.3 | 54.5 | 3.1 |
| Fri 12 Dec | £0.80 | £3.79 | £4.59 | £0.40 | 2.7 | 55.0 | 2.6 |
| Thu 11 Dec | £1.54 | £3.68 | £5.22 | £0.36 | 5.2 | 67.9 | 2.4 |
| Wed 10 Dec | £2.23 | £3.63 | £5.85 | £0.62 | 7.7 | 44.2 | 4.1 |
| Tue 9 Dec | £0.44 | £3.85 | £4.30 | £0.41 | 1.5 | 52.2 | 2.7 |
| Mon 8 Dec | £0.77 | £3.81 | £4.58 | £0.40 | 2.6 | 57.1 | 2.6 |
| Sun 7 Dec | £0.39 | £3.73 | £4.11 | £0.45 | 1.3 | 51.1 | 3.0 |
| Sat 6 Dec | £1.90 | £3.67 | £5.56 | £0.54 | 6.4 | 48.5 | 3.6 |
| Fri 5 Dec | £2.10 | £3.96 | £6.06 | £0.35 | 7.1 | 61.0 | 2.4 |
| Thu 4 Dec | £0.83 | £3.66 | £4.49 | £0.29 | 2.8 | 62.3 | 1.9 |
| Wed 3 Dec | £1.70 | £3.56 | £5.26 | £0.50 | 5.9 | 54.0 | 3.3 |
| Tue 2 Dec | £2.30 | £4.04 | £6.34 | £0.50 | 7.9 | 51.0 | 3.3 |
| Mon 1 Dec | £0.24 | £3.89 | £4.13 | £0.29 | 0.8 | 58.4 | 1.9 |
| Sun 30 Nov | £3.07 | £3.47 | £6.54 | £0.34 | 10.4 | 70.5 | 2.3 |
| Sat 29 Nov | £0.62 | £3.91 | £4.53 | £0.31 | 2.1 | 77.8 | 2.1 |
| Fri 28 Nov | £2.66 | £3.80 | £6.47 | £0.45 | 9.0 | 58.8 | 3.0 |
| Thu 27 Nov | £0.83 | £3.95 | £4.78 | £0.35 | 2.8 | 65.4 | 2.4 |
| Wed 26 Nov | £3.22 | £7.38 | £10.60 | £0.39 | 11.2 | 56.1 | 2.6 |
| Tue 25 Nov | £3.02 | £3.64 | £6.65 | £0.38 | 10.4 | 61.5 | 2.5 |
| Mon 24 Nov | £2.25 | £3.44 | £5.69 | £0.40 | 7.6 | 54.5 | 2.7 |
| Sun 23 Nov | £2.27 | £3.60 | £5.88 | £0.47 | 9.1 | 53.1 | 3.1 |
| Sat 22 Nov | £1.36 | £3.45 | £4.81 | £0.26 | 4.6 | 63.4 | 1.7 |
| Fri 21 Nov | £3.03 | £3.43 | £6.46 | £0.52 | 12.2 | 55.2 | 3.5 |
| Thu 20 Nov | £2.98 | £3.17 | £6.15 | £0.37 | 11.0 | 62.6 | 2.5 |
| Wed 19 Nov | £1.84 | £3.27 | £5.11 | £0.37 | 6.2 | 60.8 | 2.4 |
| Tue 18 Nov | £2.01 | £3.31 | £5.32 | £0.42 | 6.8 | 58.5 | 2.8 |
| Mon 17 Nov | £3.66 | £3.89 | £7.55 | £0.83 | 13.5 | 42.4 | 5.5 |
| Sun 16 Nov | £1.16 | £3.48 | £4.63 | £0.42 | 3.9 | 48.2 | 2.8 |
| Sat 15 Nov | £2.93 | £2.58 | £5.51 | £0.62 | 11.1 | 41.7 | 4.1 |
| Fri 14 Nov | £0.95 | £3.18 | £4.13 | £0.59 | 3.2 | 39.3 | 3.9 |
| Thu 13 Nov | £2.72 | £3.18 | £5.89 | £0.65 | 10.2 | 34.9 | 4.3 |
| Wed 12 Nov | £2.57 | £3.59 | £6.16 | £0.67 | 9.9 | 38.4 | 4.5 |
| Tue 11 Nov | £1.54 | £3.55 | £5.09 | £0.64 | 5.2 | 47.0 | 4.3 |
| Mon 10 Nov | £0.65 | £3.49 | £4.14 | £0.44 | 2.2 | 46.9 | 2.9 |
| Sun 9 Nov | £3.00 | £3.29 | £6.30 | £0.72 | 12.2 | 35.9 | 4.8 |
| Sat 8 Nov | £3.07 | £2.62 | £5.70 | £0.77 | 11.4 | 32.4 | 5.1 |
| Fri 7 Nov | £1.15 | £3.73 | £4.88 | £0.71 | 4.0 | 36.0 | 4.7 |
| Thu 6 Nov | £2.94 | £3.42 | £6.36 | £0.88 | 10.4 | 33.2 | 5.8 |
| Wed 5 Nov | £2.39 | £3.46 | £5.85 | £0.78 | 8.1 | 33.4 | 5.2 |
| Tue 4 Nov | £2.86 | £3.47 | £6.34 | £0.69 | 9.8 | 36.3 | 4.6 |
| Mon 3 Nov | £1.86 | £3.39 | £5.24 | £0.62 | 6.3 | 38.1 | 4.2 |
| Sun 2 Nov | £3.55 | £3.34 | £6.89 | £0.94 | 16.0 | 35.3 | 6.3 |
| Sat 1 Nov | £3.76 | £4.09 | £7.85 | £0.73 | 14.1 | 35.8 | 4.9 |
| Fri 31 Oct | £1.78 | £4.20 | £5.98 | £0.47 | 6.0 | 61.6 | 3.2 |
| Thu 30 Oct | £4.13 | £3.36 | £7.49 | £0.63 | 14.2 | 50.2 | 4.2 |
| Wed 29 Oct | £1.19 | £3.75 | £4.94 | £0.58 | 4.0 | 51.8 | 3.8 |
| Tue 28 Oct | £4.02 | £3.24 | £7.26 | £0.76 | 16.4 | 45.1 | 5.1 |
| Mon 27 Oct | £3.54 | £3.79 | £7.33 | £0.70 | 12.8 | 38.4 | 4.7 |
| Sun 26 Oct | £4.06 | £4.88 | £8.94 | £0.65 | 15.4 | 34.1 | 4.4 |
| Sat 25 Oct | £4.45 | £2.73 | £7.18 | £1.48 | 15.6 | 51.2 | 9.8 |
| Fri 24 Oct | £3.93 | £3.37 | £7.31 | £1.41 | 14.5 | 43.2 | 9.4 |
| Thu 23 Oct | £2.84 | £4.39 | £7.24 | £0.57 | 9.6 | 28.4 | 3.8 |
| Wed 22 Oct | £4.81 | £2.41 | £7.22 | £0.73 | 20.4 | 23.4 | 4.9 |
| Tue 21 Oct | £3.89 | £2.47 | £6.36 | £0.59 | 16.3 | 31.3 | 3.9 |
| Mon 20 Oct | £2.24 | £3.70 | £5.94 | £0.63 | 7.9 | 33.9 | 4.2 |
| Sun 19 Oct | £1.55 | £3.30 | £4.85 | £0.53 | 5.3 | 40.5 | 3.5 |
| Sat 18 Oct | £3.26 | £4.20 | £7.46 | £0.59 | 11.1 | 21.6 | 3.9 |
| Fri 17 Oct | £3.94 | £1.99 | £5.94 | £0.58 | 16.3 | 24.3 | 3.9 |
| Thu 16 Oct | £4.41 | £2.72 | £7.13 | £0.59 | 18.1 | 30.6 | 4.0 |
| Wed 15 Oct | £3.62 | £3.90 | £7.53 | £0.68 | 13.4 | 32.4 | 4.6 |
| Tue 14 Oct | £2.27 | £3.65 | £5.92 | £0.53 | 7.8 | 33.0 | 3.5 |
| Mon 13 Oct | £3.04 | £3.87 | £6.92 | £0.56 | 10.3 | 33.2 | 3.7 |
| Sun 12 Oct | £5.40 | £2.43 | £7.83 | £0.70 | 21.0 | 31.9 | 4.7 |
| Sat 11 Oct | £3.17 | £3.60 | £6.77 | £0.68 | 11.3 | 31.8 | 4.5 |
| Fri 10 Oct | £2.04 | £4.16 | £6.20 | £0.50 | 6.9 | 35.3 | 3.3 |
| Thu 9 Oct | £5.69 | £2.40 | £8.09 | £3.21 | 26.2 | 30.1 | 21.4 |
| Wed 8 Oct | £3.36 | £2.59 | £5.94 | £1.42 | 13.7 | 30.0 | 9.5 |
| Tue 7 Oct | £4.39 | £3.04 | £7.43 | £2.60 | 19.7 | 30.1 | 17.3 |
| Mon 6 Oct | £5.77 | £3.21 | £8.97 | £3.50 | 27.5 | 28.3 | 23.4 |
| Sun 5 Oct | £6.12 | £3.16 | £9.28 | £2.38 | 25.7 | 26.7 | 15.9 |
| Sat 4 Oct | £6.28 | £1.16 | £7.44 | £2.04 | 27.2 | 30.7 | 13.6 |
| Fri 3 Oct | £1.04 | £3.69 | £4.73 | £0.45 | 3.5 | 29.4 | 3.0 |
| Thu 2 Oct | £5.10 | £1.63 | £6.73 | £2.74 | 22.0 | 32.4 | 18.3 |
| Wed 1 Oct | £4.17 | £2.19 | £6.37 | £2.55 | 18.2 | 29.9 | 17.0 |
| Tue 30 Sep | £6.00 | £2.52 | £8.51 | £4.09 | 30.1 | 29.1 | 27.2 |
| Mon 29 Sep | £6.16 | £2.31 | £8.47 | £3.96 | 31.0 | 30.2 | 26.4 |
| Sun 28 Sep | £3.65 | £3.50 | £7.15 | £0.96 | 12.8 | 29.8 | 6.4 |
| Sat 27 Sep | £5.59 | £2.87 | £8.45 | £2.83 | 25.0 | 29.4 | 18.8 |
| Fri 26 Sep | £4.07 | £3.03 | £7.11 | £1.79 | 18.2 | 40.2 | 11.9 |
| Thu 25 Sep | £6.89 | £2.02 | £8.91 | £3.65 | 35.0 | 39.0 | 24.3 |
| Wed 24 Sep | £6.11 | £3.25 | £9.36 | £3.14 | 28.5 | 30.2 | 20.9 |
| Tue 23 Sep | £5.54 | £3.23 | £8.77 | £2.02 | 23.4 | 31.7 | 13.5 |
| Mon 22 Sep | £7.70 | £2.95 | £10.65 | £3.55 | 34.7 | 29.0 | 23.7 |
| Sun 21 Sep | £5.76 | £2.19 | £7.95 | £2.29 | 26.3 | 28.8 | 15.3 |
| Sat 20 Sep | £4.64 | £2.63 | £7.27 | £2.99 | 20.4 | 26.4 | 19.9 |
| Fri 19 Sep | £7.19 | £2.31 | £9.51 | £5.82 | 38.5 | 24.0 | 38.8 |
| Thu 18 Sep | £3.61 | £2.06 | £5.67 | £1.95 | 14.4 | 29.7 | 13.0 |
| Wed 17 Sep | £2.19 | £3.61 | £5.81 | £1.03 | 7.7 | 26.4 | 6.9 |
| Tue 16 Sep | £7.57 | £2.32 | £9.88 | £4.44 | 37.8 | 30.5 | 29.6 |
| Mon 15 Sep | £6.67 | £2.83 | £9.50 | £4.67 | 33.0 | 28.8 | 31.1 |
| Sun 14 Sep | £4.10 | £2.92 | £7.02 | £2.02 | 15.6 | 32.6 | 13.5 |
| Sat 13 Sep | £5.51 | £2.29 | £7.81 | £3.10 | 24.3 | 31.4 | 20.7 |
| Fri 12 Sep | £7.15 | −£0.48 | £6.67 | £3.67 | 36.2 | 32.7 | 24.5 |
| Thu 11 Sep | £6.35 | £2.02 | £8.36 | £4.34 | 30.7 | 30.4 | 28.9 |
| Wed 10 Sep | £3.46 | £2.00 | £5.46 | £2.30 | 13.6 | 28.6 | 15.4 |
| Tue 9 Sep | £7.68 | £1.95 | £9.63 | £6.40 | 40.8 | 29.0 | 42.7 |
| Mon 8 Sep | £7.47 | £1.97 | £9.44 | £6.30 | 39.5 | 27.4 | 42.0 |
| Sun 7 Sep | £6.82 | £2.02 | £8.84 | £5.52 | 35.2 | 26.2 | 36.8 |
| Sat 6 Sep | £8.37 | £2.23 | £10.61 | £7.39 | 46.6 | 26.2 | 49.3 |
| Fri 5 Sep | £7.65 | £2.05 | £9.70 | £5.78 | 39.8 | 27.0 | 38.5 |
| Thu 4 Sep | £6.84 | £1.97 | £8.81 | £4.88 | 33.5 | 27.1 | 32.5 |
| Wed 3 Sep | £4.12 | £2.00 | £6.12 | £2.15 | 16.6 | 28.0 | 14.3 |
| Tue 2 Sep | £4.18 | £1.98 | £6.16 | £2.25 | 16.7 | 27.9 | 15.0 |
| Mon 1 Sep | £7.61 | £1.59 | £9.20 | £5.41 | 36.9 | 27.5 | 36.0 |
| Sun 31 Aug | £7.68 | £1.74 | £9.42 | £6.19 | 39.5 | 27.7 | 41.3 |
| Sat 30 Aug | £5.66 | £2.29 | £7.94 | £3.40 | 24.6 | 26.3 | 22.7 |
| Fri 29 Aug | £6.25 | £1.91 | £8.16 | £5.26 | 32.3 | 28.6 | 35.1 |
| Thu 28 Aug | £7.18 | £0.22 | £7.39 | £4.77 | 37.9 | 27.4 | 31.8 |
| Wed 27 Aug | £5.97 | £1.47 | £7.44 | £6.48 | 33.0 | 24.4 | 43.2 |
| Tue 26 Aug | £5.98 | £1.44 | £7.43 | £6.40 | 32.9 | 25.9 | 42.7 |
| Mon 25 Aug | £8.27 | £1.46 | £9.74 | £8.99 | 49.6 | 24.9 | 60.0 |
| Sun 24 Aug | £8.73 | £1.38 | £10.11 | £9.18 | 51.9 | 25.9 | 61.2 |
| Sat 23 Aug | £5.49 | £1.51 | £7.00 | £5.93 | 30.2 | 25.7 | 39.5 |
| Fri 22 Aug | £7.65 | £1.57 | £9.22 | £7.63 | 42.9 | 27.2 | 50.9 |
| Thu 21 Aug | £9.13 | £1.57 | £10.70 | £9.10 | 52.8 | 26.4 | 60.7 |
| Wed 20 Aug | £6.10 | £1.62 | £7.72 | £6.32 | 33.1 | 25.2 | 42.1 |
| Tue 19 Aug | £7.67 | £1.58 | £9.25 | £8.10 | 44.4 | 24.5 | 54.0 |
| Mon 18 Aug | £4.69 | £1.66 | £6.35 | £5.36 | 25.1 | 24.1 | 35.7 |
| Sun 17 Aug | £9.30 | £1.68 | £10.98 | £9.69 | 55.2 | 24.4 | 64.6 |
| Sat 16 Aug | £3.81 | £1.67 | £5.48 | £4.52 | 19.6 | 26.1 | 30.2 |
| Fri 15 Aug | £8.82 | £1.68 | £10.50 | £9.24 | 51.7 | 25.1 | 61.6 |
| Thu 14 Aug | £7.32 | £1.53 | £8.85 | £7.72 | 41.3 | 25.5 | 51.4 |
| Wed 13 Aug | £4.15 | £1.61 | £5.76 | £4.79 | 21.5 | 25.6 | 31.9 |
| Tue 12 Aug | £10.50 | £1.69 | £12.20 | £8.35 | 55.1 | 24.5 | 55.7 |
| Mon 11 Aug | £9.92 | £0.88 | £10.79 | £8.63 | 57.6 | 24.2 | 57.5 |
| Sun 10 Aug | £9.73 | £1.92 | £11.65 | £9.61 | 58.3 | 24.1 | 64.1 |
| Sat 9 Aug | £10.03 | £2.29 | £12.32 | £8.68 | 55.5 | 17.7 | 57.9 |
| Fri 8 Aug | £7.37 | £0.68 | £8.06 | £6.38 | 41.5 | 25.2 | 42.6 |
| Thu 7 Aug | £7.26 | £1.98 | £9.24 | £6.32 | 39.1 | 25.5 | 42.1 |
| Wed 6 Aug | £10.30 | £1.61 | £11.90 | £9.49 | 59.3 | 25.1 | 63.3 |
| Tue 5 Aug | £9.46 | £1.88 | £11.34 | £8.30 | 52.4 | 28.4 | 55.3 |
| Mon 4 Aug | £3.26 | £2.00 | £5.26 | £2.73 | 13.9 | 25.3 | 18.2 |
| Sun 3 Aug | £5.99 | £1.63 | £7.61 | £4.81 | 28.5 | 26.9 | 32.1 |
| Sat 2 Aug | £8.20 | £1.73 | £9.94 | £7.34 | 44.6 | 26.3 | 48.9 |
| Fri 1 Aug | £8.38 | £1.61 | £10.00 | £7.45 | 45.0 | 24.9 | 49.7 |
| Thu 31 Jul | £4.80 | £1.70 | £6.50 | £4.09 | 22.3 | 26.4 | 27.2 |
| Wed 30 Jul | £7.05 | £1.57 | £8.62 | £6.43 | 37.0 | 26.1 | 42.9 |
| Tue 29 Jul | £5.61 | £2.20 | £7.81 | £4.72 | 28.5 | 24.9 | 31.5 |
| Mon 28 Jul | £8.03 | £1.57 | £9.61 | £7.80 | 45.7 | 25.2 | 52.0 |
| Sun 27 Jul | £7.03 | £1.71 | £8.74 | £6.63 | 38.3 | 26.2 | 44.2 |
| Sat 26 Jul | £6.27 | £1.75 | £8.02 | £5.77 | 32.7 | 25.0 | 38.5 |
| Fri 25 Jul | £8.36 | £1.71 | £10.06 | £7.89 | 46.7 | 24.3 | 52.6 |
| Thu 24 Jul | £6.57 | £2.29 | £8.87 | £6.10 | 36.3 | 25.5 | 40.7 |
| Wed 23 Jul | £8.29 | £1.99 | £10.28 | £7.22 | 45.0 | 26.4 | 48.1 |
| Tue 22 Jul | £6.40 | £1.73 | £8.14 | £6.04 | 33.5 | 23.6 | 40.3 |
| Mon 21 Jul | £8.59 | £1.89 | £10.48 | £8.25 | 48.9 | 22.1 | 55.0 |
| Sun 20 Jul | £6.08 | £1.38 | £7.46 | £5.20 | 30.8 | 22.3 | 34.7 |
| Sat 19 Jul | £5.42 | £1.31 | £6.73 | £5.67 | 30.1 | 23.0 | 37.8 |
| Fri 18 Jul | £9.25 | £1.30 | £10.55 | £9.25 | 54.6 | 22.4 | 61.6 |
| Thu 17 Jul | £8.36 | £1.38 | £9.74 | £8.16 | 47.9 | 22.3 | 54.4 |
| Wed 16 Jul | £10.23 | £1.41 | £11.64 | £10.19 | 61.0 | 21.2 | 67.9 |
| Tue 15 Jul | £7.54 | £1.33 | £8.87 | £7.72 | 43.5 | 21.4 | 51.5 |
| Mon 14 Jul | £8.69 | £1.53 | £10.22 | £8.64 | 50.2 | 21.3 | 57.6 |
| Sun 13 Jul | £11.25 | £1.25 | £12.51 | £11.75 | 70.1 | 21.7 | 78.3 |
| Sat 12 Jul | £11.79 | £1.08 | £12.87 | £11.08 | 69.4 | 24.1 | 73.9 |
| Fri 11 Jul | £11.94 | £2.58 | £14.51 | £10.10 | 68.0 | 25.6 | 67.3 |
| Thu 10 Jul | £10.50 | £1.76 | £12.27 | £9.45 | 58.0 | 25.3 | 63.0 |
| Wed 9 Jul | £11.42 | £1.92 | £13.34 | £10.18 | 64.4 | 26.0 | 67.9 |
| Tue 8 Jul | £12.00 | £1.77 | £13.77 | £10.89 | 68.5 | 26.1 | 72.6 |
| Mon 7 Jul | £8.26 | £1.51 | £9.77 | £7.39 | 44.2 | 26.1 | 49.3 |
| Sun 6 Jul | £6.48 | £1.72 | £8.20 | £6.00 | 34.3 | 26.4 | 40.0 |
| Sat 5 Jul | £4.03 | £1.59 | £5.63 | £4.18 | 19.9 | 26.1 | 27.9 |
| Fri 4 Jul | £13.85 | −£1.51 | £12.34 | £6.83 | 66.9 | 29.8 | 45.5 |
| Thu 3 Jul | £11.39 | £1.89 | £13.28 | £10.49 | 65.2 | 19.3 | 70.0 |
| Wed 2 Jul | £6.43 | £0.95 | £7.38 | £4.97 | 32.8 | 24.0 | 33.2 |
| Tue 1 Jul | £11.86 | £1.52 | £13.38 | £7.93 | 59.0 | 34.7 | 52.8 |
| Mon 30 Jun | £15.43 | £2.02 | £17.45 | £7.30 | 68.2 | 28.8 | 48.7 |
| Sun 29 Jun | £12.30 | £2.00 | £14.30 | £8.38 | 61.5 | 21.1 | 55.8 |
| Sat 28 Jun | £8.72 | £1.40 | £10.13 | £9.21 | 51.8 | 21.2 | 61.4 |
| Fri 27 Jun | £9.87 | £1.25 | £11.12 | £8.15 | 51.7 | 23.7 | 54.3 |
| Thu 26 Jun | £6.82 | −£1.11 | £5.72 | £3.80 | 34.7 | 28.4 | 25.3 |
| Wed 25 Jun | £11.67 | £1.84 | £13.51 | £10.73 | 67.2 | 21.0 | 71.5 |
| Tue 24 Jun | £5.79 | £1.46 | £7.25 | £5.01 | 29.5 | 20.6 | 33.4 |
| Mon 23 Jun | £11.16 | £1.14 | £12.29 | £10.57 | 66.1 | 22.5 | 70.4 |
| Sun 22 Jun | £10.09 | £1.85 | £11.94 | £8.52 | 55.9 | 22.8 | 56.8 |
| Sat 21 Jun | £8.94 | £1.79 | £10.74 | £8.40 | 52.0 | 31.6 | 56.0 |
| Fri 20 Jun | £10.29 | £1.23 | £11.52 | £9.68 | 60.8 | 23.6 | 64.5 |
| Thu 19 Jun | £11.95 | £1.57 | £13.52 | £10.73 | 69.7 | 22.6 | 71.5 |
| Wed 18 Jun | £11.46 | £1.86 | £13.32 | £9.85 | 64.7 | 22.6 | 65.7 |
| Tue 17 Jun | £11.20 | £1.50 | £12.70 | £10.21 | 64.9 | 22.4 | 68.1 |
| Mon 16 Jun | £9.08 | −£1.67 | £7.41 | £6.16 | 50.9 | 28.1 | 41.1 |
| Sun 15 Jun | £10.09 | £1.82 | £11.91 | £9.14 | 57.6 | 19.0 | 60.9 |
| Sat 14 Jun | £10.61 | £0.87 | £11.48 | £10.63 | 64.4 | 23.9 | 70.9 |
| Fri 13 Jun | £11.97 | £1.21 | £13.18 | £9.68 | 67.7 | 23.4 | 64.5 |
| Thu 12 Jun | £9.83 | £1.59 | £11.42 | £8.45 | 54.7 | 21.8 | 56.3 |
| Wed 11 Jun | £9.07 | £1.35 | £10.42 | £7.00 | 47.5 | 23.9 | 46.7 |
| Tue 10 Jun | £7.96 | £1.60 | £9.55 | £5.25 | 38.7 | 26.1 | 35.0 |
| Mon 9 Jun | £8.86 | £1.71 | £10.57 | £5.93 | 43.3 | 26.0 | 39.6 |
| Sun 8 Jun | £12.34 | £1.69 | £14.04 | £7.93 | 61.7 | 26.9 | 52.8 |
| Sat 7 Jun | £8.23 | £2.56 | £10.78 | £4.55 | 38.6 | 26.8 | 30.3 |
| Fri 6 Jun | £10.53 | £1.66 | £12.18 | £6.73 | 51.6 | 28.2 | 44.9 |
| Thu 5 Jun | £4.45 | £0.47 | £4.93 | £1.56 | 17.0 | 30.6 | 10.4 |
| Wed 4 Jun | £9.66 | £1.33 | £10.99 | £5.02 | 45.5 | 16.7 | 33.5 |
| Tue 3 Jun | £5.20 | £0.71 | £5.90 | £0.37 | 19.9 | 11.3 | 2.5 |
| Mon 2 Jun | £11.33 | −£0.30 | £11.03 | £5.76 | 60.8 | 2.2 | 38.4 |
| Sun 1 Jun | £11.61 | £0.49 | £12.11 | £7.13 | 63.3 | 5.0 | 47.5 |
| Sat 31 May | £11.88 | £0.43 | £12.31 | £8.83 | 69.6 | 6.4 | 58.9 |
| Fri 30 May | £8.11 | £0.84 | £8.95 | £3.39 | 38.8 | 12.0 | 22.6 |
| Thu 29 May | £5.94 | £0.41 | £6.35 | £2.14 | 27.3 | 11.8 | 14.3 |
| Wed 28 May | £9.74 | £0.66 | £10.40 | £5.42 | 50.7 | 15.7 | 36.1 |
| Tue 27 May | £4.58 | £1.49 | £6.06 | £1.21 | 18.4 | 17.7 | 8.0 |
| Mon 26 May | £8.86 | £0.75 | £9.62 | £4.18 | 43.9 | 13.6 | 27.9 |
| Sun 25 May | £11.23 | −£1.71 | £9.52 | £6.46 | 59.5 | 17.6 | 43.1 |
| Sat 24 May | £5.05 | £1.36 | £6.40 | £1.00 | 20.9 | 19.2 | 6.7 |
| Fri 23 May | £11.13 | £1.23 | £12.36 | £4.75 | 54.0 | 14.1 | 31.7 |
| Thu 22 May | £9.36 | £0.72 | £10.07 | £3.90 | 44.1 | 11.8 | 26.0 |
| Wed 21 May | £7.74 | £0.42 | £8.16 | £3.64 | 38.0 | 11.5 | 24.3 |
| Tue 20 May | £10.79 | £0.35 | £11.14 | £6.36 | 57.5 | 9.6 | 42.4 |
| Mon 19 May | £10.27 | −£2.49 | £7.78 | £6.00 | 54.3 | 22.7 | 40.0 |
| Sun 18 May | £11.55 | £0.56 | £12.11 | £6.38 | 59.7 | 12.4 | 42.6 |
| Sat 17 May | £13.52 | £0.65 | £14.17 | £7.06 | 69.2 | 12.3 | 47.1 |
| Fri 16 May | £13.26 | £0.54 | £13.80 | £7.47 | 70.7 | 26.6 | 49.8 |
| Thu 15 May | £7.54 | £1.88 | £9.42 | £0.44 | 26.8 | 15.2 | 3.0 |
| Wed 14 May | £13.40 | −£0.27 | £13.13 | £5.13 | 69.2 | 3.2 | 34.2 |
| Tue 13 May | £9.01 | £0.41 | £9.42 | £1.52 | 39.6 | 3.0 | 10.1 |
| Mon 12 May | £8.02 | £0.16 | £8.18 | £3.72 | 41.6 | 4.6 | 24.8 |
| Sun 11 May | £12.82 | £0.27 | £13.09 | £3.71 | 60.1 | 6.0 | 24.7 |
| Sat 10 May | £10.32 | £0.04 | £10.36 | £3.72 | 55.8 | 5.2 | 24.8 |
| Fri 9 May | £11.09 | £1.37 | £12.46 | £3.74 | 54.3 | 9.5 | 25.0 |
| Thu 8 May | £13.17 | £1.92 | £15.09 | £3.58 | 60.4 | 15.2 | 23.9 |
| Wed 7 May | £11.45 | −£4.82 | £6.62 | £3.22 | 52.5 | 29.7 | 21.5 |
| Tue 6 May | £9.91 | £0.44 | £10.35 | £1.02 | 43.9 | 10.9 | 6.8 |
| Mon 5 May | £7.94 | £2.95 | £10.89 | £1.90 | 34.2 | 9.2 | 12.7 |
| Sun 4 May | £9.62 | £1.63 | £11.25 | £1.83 | 38.0 | 18.7 | 12.2 |
| Sat 3 May | £10.02 | −£1.42 | £8.60 | £1.44 | 47.6 | 11.6 | 9.6 |
| Fri 2 May | £7.33 | £2.15 | £9.48 | £0.00 | 53.6 | 2.0 | 0.0 |
| Thu 1 May | £3.68 | £0.96 | £4.63 | £0.00 | 47.0 | 1.8 | 0.0 |
| Wed 30 Apr | £2.97 | £2.07 | £5.04 | £0.00 | 48.1 | 2.2 | 0.0 |
| Tue 29 Apr | £4.11 | £1.63 | £5.73 | £0.00 | 51.1 | 2.5 | 0.0 |
| Mon 28 Apr | £4.89 | £2.49 | £7.38 | £0.00 | 54.7 | 3.6 | 0.0 |
| Sun 27 Apr | £5.50 | £2.89 | £8.39 | £0.00 | 45.4 | 3.4 | 0.0 |
| Sat 26 Apr | £5.95 | £1.54 | £7.49 | £0.00 | 48.9 | 9.9 | 0.0 |
| Fri 25 Apr | £5.84 | £2.69 | £8.54 | £0.00 | 45.1 | 12.7 | 0.0 |
| Thu 24 Apr | £3.76 | £2.11 | £5.87 | £0.00 | 13.4 | 33.2 | 0.0 |
| Wed 23 Apr | £3.76 | −£3.61 | £0.15 | £0.00 | 12.8 | 59.5 | 0.0 |
| Tue 22 Apr | £6.46 | £1.92 | £8.38 | £0.00 | 25.8 | 31.3 | 0.0 |
| Mon 21 Apr | £5.36 | £2.47 | £7.83 | £0.00 | 21.8 | 36.1 | 0.0 |
| Sun 20 Apr | £6.17 | £3.17 | £9.34 | £0.00 | 21.8 | 26.6 | 0.0 |
| Sat 19 Apr | £5.12 | £2.68 | £7.80 | £0.00 | 23.5 | 26.7 | 0.0 |
| Fri 18 Apr | £6.59 | £2.61 | £9.20 | £0.00 | 24.7 | 23.8 | 0.0 |
| Thu 17 Apr | £5.32 | £2.71 | £8.02 | £0.00 | 26.7 | 27.4 | 0.0 |
| Wed 16 Apr | £6.32 | £2.21 | £8.53 | £0.00 | 26.4 | 33.8 | 0.0 |
| Tue 15 Apr | £3.96 | £0.25 | £4.22 | £0.00 | 14.5 | 45.5 | 0.0 |
| Mon 14 Apr | £5.63 | £3.38 | £9.00 | £0.00 | 21.8 | 23.3 | 0.0 |
| Sun 13 Apr | £4.68 | £2.21 | £6.89 | £0.00 | 20.8 | 19.7 | 0.0 |
| Sat 12 Apr | £3.65 | £1.06 | £4.71 | £0.00 | 18.3 | 24.9 | 0.0 |
| Fri 11 Apr | £3.79 | £0.84 | £4.63 | £0.00 | 21.3 | 32.1 | 0.0 |
| Thu 10 Apr | £1.92 | £6.72 | £8.64 | £0.00 | 29.3 | 33.9 | 0.0 |
| Wed 9 Apr | £1.43 | £0.34 | £1.77 | £0.00 | 4.9 | 56.6 | 0.0 |
| Tue 8 Apr | £0.00 | £0.00 | £0.00 | £0.00 | 0.0 | 53.0 | 0.0 |
| Mon 7 Apr | £0.00 | £0.00 | £0.00 | £0.00 | 0.0 | 52.3 | 0.0 |
| Sun 6 Apr | £0.00 | £0.00 | £0.00 | £0.00 | 0.0 | 50.6 | 0.0 |
| Sat 5 Apr | £0.00 | £0.00 | £0.00 | £0.00 | 0.0 | 44.5 | 0.0 |
| Fri 4 Apr | £0.00 | £0.00 | £0.00 | £0.00 | 0.0 | 43.2 | 0.0 |
Cumulative benefit
Running total across the selected window.
Saturday 3 January 2026, half by half
Energy arriving above the line, energy leaving below it, and the price you were paying on the same timeline. Charging through a cheap window and discharging through an expensive one is the shape to look for.
Solar generated
Imported
Exported (below the line)
Inverter versus meter
The two measure at different points in the circuit and will never agree exactly. A few percent of drift is normal; a consistent double-digit gap means one feed is wrong and the solar/battery split should be treated with suspicion. The headline figures come from the meter either way.
| Day | Meter import | Inverter import | Drift | Meter export | Inverter export | Drift |
|---|---|---|---|---|---|---|
| Wed 31 Dec | 70.52 | 67.69 | -4.0% | 1.12 | 0.39 | -65.0% |
| Tue 30 Dec | 74.70 | 72.76 | -2.6% | 1.08 | 0.25 | -76.8% |
| Mon 29 Dec | 68.02 | 65.71 | -3.4% | 1.52 | 0.32 | -78.9% |
| Sun 28 Dec | 61.81 | 59.12 | -4.3% | 1.84 | 0.35 | -81.0% |
| Sat 27 Dec | 87.56 | 85.42 | -2.4% | 0.87 | 0.16 | -81.5% |
| Fri 26 Dec | 98.47 | 96.42 | -2.1% | 0.97 | 0.24 | -75.3% |
| Thu 25 Dec | 112.42 | 110.28 | -1.9% | 1.17 | 0.36 | -69.2% |
| Wed 24 Dec | 87.28 | 85.11 | -2.5% | 1.26 | 0.28 | -77.8% |
| Tue 23 Dec | 74.79 | 72.59 | -2.9% | 2.10 | 0.82 | -61.0% |
| Mon 22 Dec | 58.27 | 55.38 | -5.0% | 2.88 | 1.16 | -59.7% |
| Sun 21 Dec | 61.57 | 58.23 | -5.4% | 2.28 | 0.47 | -79.4% |
| Sat 20 Dec | 59.87 | 56.59 | -5.5% | 2.72 | 0.84 | -69.1% |
| Fri 19 Dec | 53.75 | 50.88 | -5.3% | 3.20 | 0.77 | -76.0% |
| Thu 18 Dec | 72.41 | 71.08 | -1.8% | 1.85 | 0.46 | -75.2% |
Return on investment
Measured across everything on record (7 Apr 2025 to 31 Aug 2026), not the range selected above — annualising a fortnight of summer would roughly double the apparent return. The yearly figure comes from the trailing twelve months, so it covers a full seasonal cycle.
Recovered so far
£4,118
of £18,990
21.7% recovered
£14,872 to go
Benefit per year
£2,743
Trailing 12 months
Annual return
14.4%
Of the £18,990 outlay
Full payback
5.4 yrs
Around Feb 2032