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 £150 off a heat pump £150 off air conditioning £50 off your Octopus bill Referrals
Saved on bills is the gap between what you would have paid and what you actually paid. Total benefit is that saving plus the export payments.
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.
View as table
| Day | Solar | Battery | Total | of which export | Solar kWh | Imported | Exported |
|---|---|---|---|---|---|---|---|
| Sat 7 Nov | £0.00 | −£0.20 | −£0.20 | £0.00 | 0.0 | 3.8 | 0.0 |
| Fri 6 Nov | £4.03 | £2.58 | £6.61 | £0.17 | 13.4 | 31.7 | 1.4 |
| Thu 5 Nov | £3.66 | £3.59 | £7.24 | £0.16 | 12.2 | 39.8 | 1.4 |
| Wed 4 Nov | £1.72 | £4.35 | £6.07 | £0.13 | 5.4 | 32.6 | 1.1 |
| Tue 3 Nov | £3.32 | £3.25 | £6.56 | £0.17 | 12.2 | 32.6 | 1.4 |
| Mon 2 Nov | £3.23 | £3.93 | £7.16 | £0.14 | 12.1 | 34.3 | 1.2 |
| Sun 1 Nov | £2.97 | £4.65 | £7.62 | £0.17 | 9.3 | 25.4 | 1.4 |
| Sat 31 Oct | £4.48 | £3.53 | £8.01 | £0.20 | 17.3 | 21.6 | 1.7 |
| Fri 30 Oct | £3.82 | £4.21 | £8.02 | £0.19 | 16.7 | 21.1 | 1.6 |
| Thu 29 Oct | £3.71 | £3.53 | £7.24 | £0.23 | 12.2 | 17.2 | 1.9 |
| Wed 28 Oct | £4.09 | £3.02 | £7.11 | £0.19 | 17.1 | 25.3 | 1.5 |
| Tue 27 Oct | £3.51 | £3.89 | £7.40 | £0.21 | 13.2 | 37.5 | 1.7 |
| Mon 26 Oct | £1.38 | £4.87 | £6.24 | £0.16 | 4.4 | 27.4 | 1.4 |
| Sun 25 Oct | £5.07 | £3.06 | £8.14 | £0.35 | 18.2 | 27.9 | 2.9 |
| Sat 24 Oct | £1.82 | £4.73 | £6.55 | £0.06 | 5.7 | 38.1 | 0.5 |
| Fri 23 Oct | £2.49 | £4.78 | £7.27 | £0.11 | 7.8 | 29.1 | 0.9 |
| Thu 22 Oct | £5.36 | £3.82 | £9.17 | £0.17 | 19.8 | 26.8 | 1.4 |
| Wed 21 Oct | £3.87 | £4.79 | £8.66 | £0.14 | 13.5 | 26.1 | 1.2 |
| Tue 20 Oct | £1.67 | £4.37 | £6.04 | £0.18 | 5.3 | 27.6 | 1.5 |
| Mon 19 Oct | £4.72 | £3.67 | £8.40 | £0.16 | 18.3 | 24.9 | 1.3 |
| Sun 18 Oct | £4.41 | £5.19 | £9.60 | £0.18 | 16.4 | 19.4 | 1.5 |
| Sat 17 Oct | £5.31 | £4.87 | £10.18 | £0.18 | 23.9 | 13.1 | 1.5 |
| Fri 16 Oct | £4.71 | £2.79 | £7.50 | £0.38 | 20.0 | 19.9 | 3.2 |
| Thu 15 Oct | £2.48 | £3.34 | £5.82 | £0.27 | 8.1 | 13.9 | 2.3 |
| Wed 14 Oct | £3.98 | £3.15 | £7.13 | £0.24 | 20.2 | 12.8 | 2.0 |
| Tue 13 Oct | £3.81 | £1.95 | £5.76 | £0.76 | 18.0 | 25.2 | 6.4 |
| Mon 12 Oct | £2.75 | £3.92 | £6.67 | £0.34 | 8.6 | 22.7 | 2.8 |
| Sun 11 Oct | £4.91 | £3.75 | £8.66 | £0.95 | 21.0 | 26.3 | 7.9 |
| Sat 10 Oct | £5.51 | £3.89 | £9.40 | £0.17 | 22.9 | 24.1 | 1.4 |
| Fri 9 Oct | £3.41 | £4.32 | £7.73 | £0.31 | 11.7 | 25.2 | 2.6 |
| Thu 8 Oct | £6.85 | £5.11 | £11.96 | £0.84 | 29.5 | 22.4 | 7.0 |
| Wed 7 Oct | £1.54 | £4.61 | £6.15 | £0.06 | 5.0 | 15.5 | 0.5 |
| Tue 6 Oct | £5.01 | £1.21 | £6.22 | £1.77 | 26.6 | 15.4 | 14.8 |
| Mon 5 Oct | £4.71 | £1.31 | £6.02 | £1.51 | 28.7 | 9.6 | 12.6 |
| Sun 4 Oct | £5.38 | £1.33 | £6.71 | £1.07 | 28.3 | 1.0 | 8.9 |
| Sat 3 Oct | £5.05 | −£0.26 | £4.79 | £0.06 | 22.1 | 1.2 | 0.5 |
| Fri 2 Oct | £5.48 | £1.37 | £6.85 | £2.31 | 27.1 | 2.1 | 19.3 |
| Thu 1 Oct | £5.84 | £0.61 | £6.45 | £2.45 | 27.9 | 14.3 | 20.4 |
| Wed 30 Sep | £3.20 | £1.46 | £4.66 | £1.51 | 15.1 | 14.7 | 12.6 |
| Tue 29 Sep | £5.03 | £2.33 | £7.36 | £2.70 | 27.4 | 9.1 | 22.5 |
| Mon 28 Sep | £1.91 | £1.45 | £3.37 | £0.16 | 7.8 | 9.7 | 1.3 |
| Sun 27 Sep | £4.11 | £0.06 | £4.17 | £0.52 | 24.8 | 8.7 | 4.3 |
| Sat 26 Sep | £5.10 | £2.18 | £7.28 | £2.27 | 33.0 | 1.4 | 18.9 |
| Fri 25 Sep | £5.70 | £1.03 | £6.73 | £2.10 | 34.8 | 1.0 | 17.5 |
| Thu 24 Sep | £4.84 | £1.29 | £6.13 | £1.39 | 27.0 | 1.5 | 11.6 |
| Wed 23 Sep | £5.66 | £0.95 | £6.61 | £1.74 | 31.3 | 1.0 | 14.5 |
| Tue 22 Sep | £5.15 | £0.07 | £5.22 | £0.98 | 35.2 | 1.0 | 8.1 |
| Mon 21 Sep | £5.80 | £1.20 | £7.00 | £2.34 | 35.7 | 1.0 | 19.5 |
| Sun 20 Sep | £4.31 | −£0.24 | £4.07 | £0.08 | 30.6 | 1.2 | 0.7 |
| Sat 19 Sep | £2.61 | £0.58 | £3.19 | £1.41 | 16.7 | 1.5 | 11.7 |
| Fri 18 Sep | £5.01 | −£1.43 | £3.58 | £0.68 | 29.3 | 1.8 | 5.7 |
| Thu 17 Sep | £4.51 | £1.13 | £5.65 | £1.52 | 26.3 | 1.0 | 12.7 |
| Wed 16 Sep | £4.95 | £0.76 | £5.71 | £1.24 | 25.9 | 1.3 | 10.3 |
| Tue 15 Sep | £3.96 | £1.02 | £4.98 | £0.86 | 22.1 | 1.1 | 7.2 |
| Mon 14 Sep | £4.36 | £0.79 | £5.15 | £1.57 | 26.1 | 1.2 | 13.1 |
| Sun 13 Sep | £2.64 | £0.71 | £3.35 | £0.07 | 15.6 | 1.2 | 0.6 |
| Sat 12 Sep | £5.62 | £0.92 | £6.54 | £2.28 | 31.6 | 1.0 | 19.0 |
| Fri 11 Sep | £4.94 | −£0.01 | £4.93 | £2.14 | 30.0 | 1.3 | 17.9 |
| Thu 10 Sep | £5.83 | £0.85 | £6.69 | £1.90 | 30.8 | 1.4 | 15.8 |
| Wed 9 Sep | £6.08 | £0.45 | £6.53 | £0.60 | 29.9 | 1.4 | 5.0 |
| Tue 8 Sep | £2.61 | £1.50 | £4.10 | £0.03 | 11.6 | 0.9 | 0.2 |
| Mon 7 Sep | £6.04 | £1.70 | £7.74 | £1.13 | 25.3 | 1.5 | 9.4 |
| Sun 6 Sep | £5.78 | £0.01 | £5.79 | £2.95 | 36.9 | 1.3 | 24.6 |
| Sat 5 Sep | £6.33 | £0.68 | £7.01 | £4.23 | 45.3 | 1.3 | 35.3 |
| Fri 4 Sep | £4.06 | £1.20 | £5.26 | £1.79 | 24.5 | 1.2 | 14.9 |
| Thu 3 Sep | £4.18 | −£0.40 | £3.78 | £1.15 | 24.2 | 1.4 | 9.5 |
| Wed 2 Sep | £3.93 | £1.58 | £5.51 | £1.39 | 22.3 | 1.5 | 11.6 |
| Tue 1 Sep | £6.35 | £0.18 | £6.53 | £3.54 | 41.4 | 1.1 | 29.5 |
| Mon 31 Aug | £4.96 | £0.42 | £5.38 | £2.48 | 30.9 | 0.9 | 20.6 |
| Sun 30 Aug | £4.85 | −£0.74 | £4.10 | £1.38 | 30.1 | 0.8 | 11.5 |
| Sat 29 Aug | £2.36 | £0.36 | £2.73 | £0.17 | 12.3 | 1.1 | 1.4 |
| Fri 28 Aug | £5.95 | £0.28 | £6.23 | £3.79 | 40.1 | 1.3 | 31.6 |
| Thu 27 Aug | £4.32 | £0.21 | £4.52 | £2.22 | 28.1 | 1.3 | 18.5 |
| Wed 26 Aug | £6.81 | £0.14 | £6.95 | £3.58 | 43.8 | 1.0 | 29.8 |
| Tue 25 Aug | £7.18 | £0.46 | £7.64 | £4.55 | 50.4 | 1.0 | 37.9 |
| Mon 24 Aug | £7.79 | £0.36 | £8.15 | £3.76 | 47.2 | 1.7 | 31.3 |
| Sun 23 Aug | £7.55 | £0.89 | £8.44 | £2.70 | 41.2 | 1.6 | 22.5 |
| Sat 22 Aug | £7.50 | £0.29 | £7.79 | £3.93 | 47.2 | 2.0 | 32.7 |
| Fri 21 Aug | £6.59 | £0.60 | £7.19 | £3.36 | 41.5 | 1.5 | 28.0 |
| Thu 20 Aug | £6.33 | £0.11 | £6.43 | £2.82 | 38.5 | 1.3 | 23.5 |
| Wed 19 Aug | £4.85 | £0.65 | £5.50 | £2.23 | 31.6 | 1.1 | 18.5 |
| Tue 18 Aug | £4.48 | £0.51 | £4.98 | £1.72 | 27.0 | 0.8 | 14.3 |
| Mon 17 Aug | £5.86 | £0.31 | £6.17 | £2.54 | 36.5 | 0.7 | 21.2 |
| Sun 16 Aug | £5.45 | £0.49 | £5.93 | £1.87 | 32.1 | 0.8 | 15.6 |
| Sat 15 Aug | £6.26 | −£0.18 | £6.07 | £2.17 | 40.8 | 0.9 | 18.1 |
| Fri 14 Aug | £7.40 | −£0.47 | £6.93 | £3.55 | 48.8 | 0.8 | 29.6 |
| Thu 13 Aug | £8.27 | £1.41 | £9.67 | £3.97 | 52.0 | 0.6 | 33.1 |
| Wed 12 Aug | £7.84 | £0.21 | £8.06 | £4.39 | 53.9 | 0.7 | 36.6 |
| Tue 11 Aug | £7.90 | £0.28 | £8.18 | £5.06 | 55.8 | 0.8 | 42.2 |
| Mon 10 Aug | £8.32 | £0.14 | £8.47 | £4.32 | 54.4 | 1.0 | 36.0 |
| Sun 9 Aug | £6.86 | −£1.83 | £5.03 | £2.14 | 52.8 | 1.3 | 17.8 |
| Sat 8 Aug | £8.64 | £0.79 | £9.43 | £5.05 | 56.1 | 1.0 | 42.1 |
| Fri 7 Aug | £8.39 | −£0.19 | £8.20 | £5.41 | 58.3 | 1.0 | 45.1 |
| Thu 6 Aug | £8.32 | £0.67 | £8.99 | £4.28 | 49.3 | 1.3 | 35.7 |
| Wed 5 Aug | £6.50 | −£1.87 | £4.63 | £1.87 | 42.8 | 4.6 | 15.6 |
| Tue 4 Aug | £6.79 | £0.14 | £6.93 | £2.95 | 40.8 | 0.9 | 24.6 |
| Mon 3 Aug | £7.48 | £0.64 | £8.12 | £3.84 | 47.0 | 0.9 | 32.0 |
| Sun 2 Aug | £8.80 | £0.33 | £9.14 | £4.78 | 56.2 | 1.1 | 39.8 |
| Sat 1 Aug | £9.04 | £0.22 | £9.27 | £5.16 | 59.4 | 1.1 | 43.0 |
| Fri 31 Jul | £7.12 | £0.55 | £7.67 | £4.01 | 48.2 | 0.8 | 33.4 |
| Thu 30 Jul | £8.41 | £0.34 | £8.75 | £4.33 | 52.8 | 0.8 | 36.1 |
| Wed 29 Jul | £8.95 | £0.85 | £9.80 | £5.32 | 58.4 | 0.9 | 44.4 |
| Tue 28 Jul | £8.19 | −£0.35 | £7.84 | £3.99 | 51.9 | 1.3 | 33.3 |
| Mon 27 Jul | £8.23 | £1.81 | £10.04 | £5.19 | 57.5 | 1.1 | 43.2 |
| Sun 26 Jul | £7.54 | £0.01 | £7.55 | £2.57 | 43.4 | 1.0 | 21.4 |
| Sat 25 Jul | £9.35 | £1.59 | £10.94 | £5.15 | 59.8 | 1.2 | 42.9 |
| Fri 24 Jul | £7.81 | −£0.56 | £7.25 | £2.68 | 44.9 | 1.5 | 22.3 |
| Thu 23 Jul | £6.33 | £0.91 | £7.24 | £2.93 | 40.5 | 1.8 | 24.4 |
| Wed 22 Jul | £6.53 | £0.55 | £7.08 | £2.60 | 41.0 | 1.4 | 21.6 |
| Tue 21 Jul | £6.08 | £1.93 | £8.01 | £2.67 | 36.9 | 1.7 | 22.2 |
| Mon 20 Jul | £10.04 | £0.71 | £10.76 | £5.46 | 64.3 | 2.0 | 45.5 |
| Sun 19 Jul | £9.07 | £0.72 | £9.79 | £5.99 | 62.9 | 1.4 | 49.9 |
| Sat 18 Jul | £8.79 | −£0.22 | £8.57 | £5.67 | 61.4 | 1.0 | 47.3 |
| Fri 17 Jul | £8.00 | £0.09 | £8.09 | £5.09 | 55.5 | 1.4 | 42.5 |
| Thu 16 Jul | £9.58 | −£0.24 | £9.34 | £5.30 | 64.7 | 0.9 | 44.2 |
| Wed 15 Jul | £9.76 | £1.20 | £10.96 | £5.54 | 66.0 | 1.2 | 46.1 |
| Tue 14 Jul | £11.88 | −£0.12 | £11.77 | £5.20 | 67.1 | 0.9 | 43.3 |
| Mon 13 Jul | £9.62 | −£0.52 | £9.10 | £5.43 | 67.4 | 1.0 | 45.3 |
| Sun 12 Jul | £9.19 | −£0.66 | £8.53 | £5.44 | 68.3 | 0.9 | 45.3 |
| Sat 11 Jul | £9.56 | £0.39 | £9.95 | £6.14 | 66.7 | 0.8 | 51.2 |
| Fri 10 Jul | £9.40 | £0.78 | £10.18 | £5.83 | 62.9 | 0.8 | 48.6 |
| Thu 9 Jul | £9.28 | £0.19 | £9.47 | £5.94 | 63.6 | 0.8 | 49.5 |
| Wed 8 Jul | £10.20 | £0.42 | £10.63 | £5.22 | 63.5 | 0.7 | 43.5 |
| Tue 7 Jul | £9.02 | £0.51 | £9.53 | £5.70 | 62.3 | 0.9 | 47.5 |
| Mon 6 Jul | £9.73 | £0.57 | £10.30 | £5.77 | 64.5 | 0.9 | 48.1 |
| Sun 5 Jul | £10.40 | £0.23 | £10.64 | £5.17 | 63.1 | 1.1 | 43.1 |
| Sat 4 Jul | £9.27 | £0.52 | £9.79 | £4.50 | 57.2 | 1.2 | 37.5 |
| Fri 3 Jul | £10.08 | −£0.07 | £10.01 | £6.48 | 68.5 | 1.1 | 54.0 |
| Thu 2 Jul | £9.40 | −£0.01 | £9.38 | £5.58 | 62.2 | 0.9 | 46.5 |
| Wed 1 Jul | £7.17 | −£1.03 | £6.14 | £2.29 | 43.4 | 1.8 | 19.1 |
| Tue 30 Jun | £6.52 | −£1.32 | £5.20 | £2.23 | 41.5 | 1.6 | 18.6 |
| Mon 29 Jun | £9.71 | £0.16 | £9.88 | £5.53 | 62.4 | 0.9 | 46.1 |
| Sun 28 Jun | £9.94 | £0.27 | £10.21 | £4.47 | 59.6 | 0.8 | 37.3 |
| Sat 27 Jun | £7.14 | £0.35 | £7.49 | £3.47 | 45.0 | 0.8 | 28.9 |
| Fri 26 Jun | £9.37 | −£1.79 | £7.58 | £3.44 | 60.0 | 0.6 | 28.6 |
| Thu 25 Jun | £9.87 | −£1.88 | £7.99 | £4.36 | 66.3 | 0.8 | 36.3 |
| Wed 24 Jun | £9.93 | £0.50 | £10.43 | £6.11 | 66.4 | 0.5 | 50.9 |
| Tue 23 Jun | £7.93 | £0.23 | £8.15 | £5.15 | 55.6 | 0.7 | 42.9 |
| Mon 22 Jun | £10.04 | £0.05 | £10.09 | £6.26 | 67.6 | 1.2 | 52.1 |
| Sun 21 Jun | £8.13 | £0.31 | £8.45 | £5.06 | 53.5 | 1.1 | 42.1 |
| Sat 20 Jun | £6.06 | −£0.38 | £5.68 | £2.62 | 36.9 | 1.4 | 21.9 |
| Fri 19 Jun | £10.45 | £0.46 | £10.91 | £6.30 | 70.3 | 1.8 | 52.5 |
| Thu 18 Jun | £6.02 | £0.16 | £6.17 | £2.51 | 34.6 | 1.7 | 21.0 |
| Wed 17 Jun | £6.46 | £0.15 | £6.61 | £2.94 | 39.2 | 1.8 | 24.5 |
| Tue 16 Jun | £9.60 | £0.02 | £9.61 | £5.73 | 63.2 | 1.9 | 47.7 |
| Mon 15 Jun | £9.42 | −£0.16 | £9.26 | £4.37 | 55.8 | 2.2 | 36.4 |
| Sun 14 Jun | £10.64 | −£0.92 | £9.72 | £4.82 | 67.0 | 2.0 | 40.1 |
| Sat 13 Jun | £12.78 | £1.86 | £14.64 | £5.00 | 72.0 | 2.8 | 41.6 |
| Fri 12 Jun | £8.61 | £1.53 | £10.14 | £1.99 | 35.3 | 16.0 | 16.6 |
| Thu 11 Jun | £5.61 | £1.68 | £7.28 | £0.69 | 18.0 | 17.3 | 5.7 |
| Wed 10 Jun | £0.00 | −£0.05 | −£0.05 | £0.00 | 0.0 | 22.4 | 0.0 |
| Tue 9 Jun | £1.71 | −£0.09 | £1.63 | £0.17 | 6.8 | 25.3 | 1.5 |
| Mon 8 Jun | £5.59 | £0.94 | £6.54 | £1.30 | 23.5 | 16.3 | 10.9 |
| Sun 7 Jun | £5.91 | −£1.57 | £4.35 | £0.91 | 34.8 | 10.4 | 7.6 |
| Sat 6 Jun | £4.79 | £3.69 | £8.48 | £0.48 | 19.4 | 5.1 | 4.0 |
| Fri 5 Jun | £7.16 | −£0.42 | £6.74 | £2.85 | 40.7 | 4.2 | 23.7 |
| Thu 4 Jun | £7.91 | £0.41 | £8.32 | £2.10 | 40.1 | 3.9 | 17.5 |
| Wed 3 Jun | £5.39 | £0.08 | £5.47 | £0.39 | 20.8 | 4.7 | 3.3 |
| Tue 2 Jun | £5.91 | £0.26 | £6.17 | £1.94 | 31.2 | 2.1 | 16.2 |
| Mon 1 Jun | £7.63 | −£0.16 | £7.47 | £4.01 | 48.7 | 1.5 | 33.5 |
| Sun 31 May | £7.17 | £0.10 | £7.27 | £3.80 | 46.8 | 0.9 | 31.7 |
| Sat 30 May | £9.24 | £0.34 | £9.57 | £5.35 | 60.3 | 1.0 | 44.6 |
| Fri 29 May | £7.48 | £0.31 | £7.79 | £3.72 | 46.1 | 0.7 | 31.0 |
| Thu 28 May | £8.03 | −£0.20 | £7.83 | £4.84 | 55.8 | 0.8 | 40.3 |
| Wed 27 May | £10.57 | £0.72 | £11.28 | £5.61 | 65.5 | 0.8 | 46.8 |
| Tue 26 May | £9.56 | £0.42 | £9.98 | £6.02 | 64.1 | 0.9 | 50.2 |
| Mon 25 May | £8.85 | −£0.09 | £8.76 | £5.20 | 59.5 | 0.8 | 43.4 |
| Sun 24 May | £8.94 | £0.32 | £9.26 | £5.52 | 60.6 | 1.0 | 46.0 |
| Sat 23 May | £9.78 | £0.04 | £9.82 | £4.73 | 61.0 | 1.1 | 39.5 |
| Fri 22 May | £10.44 | £1.17 | £11.61 | £6.12 | 65.1 | 7.0 | 51.0 |
| Thu 21 May | £11.31 | £1.38 | £12.70 | £4.62 | 58.0 | 15.7 | 38.5 |
| Wed 20 May | £9.46 | £1.31 | £10.76 | £2.30 | 39.9 | 21.5 | 19.1 |
| Tue 19 May | £6.95 | £3.55 | £10.50 | £0.70 | 27.6 | 23.9 | 5.9 |
| Mon 18 May | £8.92 | £3.05 | £11.97 | £1.42 | 34.5 | 22.7 | 11.8 |
| Sun 17 May | £11.41 | £3.20 | £14.60 | £2.39 | 46.4 | 21.8 | 19.9 |
| Sat 16 May | £8.96 | £2.12 | £11.08 | £1.39 | 35.6 | 21.9 | 11.6 |
| Fri 15 May | £9.37 | £2.63 | £11.99 | £1.98 | 39.7 | 21.7 | 16.5 |
| Thu 14 May | £10.36 | £2.25 | £12.60 | £2.93 | 45.8 | 24.3 | 24.4 |
| Wed 13 May | £9.20 | £3.50 | £12.70 | £2.76 | 43.6 | 20.0 | 23.0 |
| Tue 12 May | £10.29 | £2.63 | £12.92 | £2.76 | 49.2 | 22.6 | 23.0 |
| Mon 11 May | £7.27 | £2.44 | £9.71 | £0.80 | 29.3 | 25.2 | 6.7 |
| Sun 10 May | £5.34 | £3.68 | £9.02 | £0.71 | 19.4 | 18.0 | 5.9 |
| Sat 9 May | £10.66 | £2.00 | £12.66 | £4.32 | 56.0 | 15.7 | 36.0 |
| Fri 8 May | £9.25 | £2.01 | £11.26 | £2.84 | 44.0 | 17.0 | 23.7 |
| Thu 7 May | £6.91 | £1.94 | £8.84 | £0.60 | 24.2 | 17.5 | 5.0 |
| Wed 6 May | £9.42 | £1.50 | £10.92 | £3.09 | 44.9 | 15.5 | 25.7 |
| Tue 5 May | £9.67 | £1.54 | £11.21 | £4.38 | 53.0 | 15.2 | 36.5 |
| Mon 4 May | £6.48 | £1.30 | £7.78 | £1.37 | 27.2 | 20.7 | 11.5 |
| Sun 3 May | £8.69 | £2.19 | £10.88 | £3.32 | 42.7 | 13.9 | 27.7 |
| Sat 2 May | £8.91 | £0.89 | £9.80 | £4.66 | 52.2 | 12.0 | 38.8 |
| Fri 1 May | £8.57 | £0.73 | £9.30 | £4.45 | 50.4 | 14.6 | 37.1 |
| Thu 30 Apr | £9.27 | £2.77 | £12.04 | £4.08 | 53.5 | 18.0 | 34.0 |
| Wed 29 Apr | £9.20 | £2.22 | £11.42 | £4.42 | 55.2 | 14.5 | 36.9 |
| Tue 28 Apr | £7.75 | £1.50 | £9.25 | £3.05 | 43.3 | 15.9 | 25.5 |
| Mon 27 Apr | £8.83 | £1.99 | £10.83 | £4.09 | 53.9 | 15.6 | 34.0 |
| Sun 26 Apr | £9.71 | £0.97 | £10.68 | £3.59 | 53.0 | 16.7 | 29.9 |
| Sat 25 Apr | £9.38 | £2.22 | £11.60 | £3.55 | 52.3 | 19.9 | 29.6 |
| Fri 24 Apr | £10.15 | £2.31 | £12.46 | £4.40 | 59.8 | 22.2 | 36.7 |
| Thu 23 Apr | £9.56 | £3.37 | £12.93 | £4.15 | 57.3 | 19.6 | 34.6 |
| Wed 22 Apr | £10.02 | £2.29 | £12.32 | £4.20 | 59.3 | 24.3 | 35.0 |
| Tue 21 Apr | £7.14 | £2.75 | £9.89 | £1.01 | 36.2 | 23.1 | 8.4 |
| Mon 20 Apr | £7.82 | £3.03 | £10.85 | £2.37 | 40.9 | 20.1 | 19.7 |
| Sun 19 Apr | £9.31 | £2.14 | £11.45 | £3.44 | 51.6 | 17.3 | 28.7 |
| Sat 18 Apr | £8.18 | £1.13 | £9.31 | £2.81 | 46.5 | 19.8 | 23.4 |
| Fri 17 Apr | £7.99 | £1.04 | £9.02 | £3.25 | 48.6 | 22.0 | 27.0 |
| Thu 16 Apr | £6.03 | £2.02 | £8.05 | £0.57 | 23.9 | 31.5 | 4.8 |
| Wed 15 Apr | £3.72 | £3.52 | £7.24 | £0.59 | 13.3 | 36.5 | 4.9 |
| Tue 14 Apr | £5.32 | £3.30 | £8.62 | £0.63 | 19.2 | 34.5 | 5.3 |
| Mon 13 Apr | £4.85 | £3.11 | £7.97 | £0.67 | 17.4 | 32.4 | 5.5 |
| Sun 12 Apr | £5.04 | £3.22 | £8.25 | £0.77 | 18.2 | 32.3 | 6.4 |
| Sat 11 Apr | £4.16 | £3.50 | £7.66 | £0.65 | 14.9 | 31.5 | 5.4 |
| Fri 10 Apr | £4.23 | £2.35 | £6.58 | £0.59 | 15.2 | 25.0 | 4.9 |
| Thu 9 Apr | £2.79 | £2.10 | £4.89 | £0.48 | 10.4 | 24.2 | 4.0 |
| Wed 8 Apr | £3.01 | £1.63 | £4.65 | £0.49 | 11.0 | 30.6 | 4.1 |
| Tue 7 Apr | £4.05 | £3.50 | £7.55 | £0.68 | 14.5 | 31.4 | 5.6 |
Cumulative benefit
Running total across the selected window.
Saturday 7 November 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.
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 |
|---|---|---|---|---|---|---|
| Sat 7 Nov | 3.76 | 25.84 | 588.0% | 0.00 | 2.75 | — |
| Fri 6 Nov | 31.68 | 28.51 | -10.0% | 1.41 | 0.05 | -96.4% |
| Thu 5 Nov | 39.84 | 36.85 | -7.5% | 1.35 | 0.06 | -95.6% |
| Wed 4 Nov | 32.60 | 29.31 | -10.1% | 1.12 | 0.06 | -94.6% |
| Tue 3 Nov | 32.58 | 29.35 | -9.9% | 1.40 | 0.07 | -95.0% |
| Mon 2 Nov | 34.28 | 31.48 | -8.2% | 1.20 | 0.05 | -95.8% |
| Sun 1 Nov | 25.39 | 22.10 | -13.0% | 1.40 | 0.08 | -94.3% |
| Sat 31 Oct | 21.64 | 18.14 | -16.2% | 1.69 | 0.06 | -96.5% |
| Fri 30 Oct | 21.06 | 18.16 | -13.8% | 1.56 | 0.32 | -79.5% |
| Thu 29 Oct | 17.18 | 13.85 | -19.4% | 1.92 | 0.07 | -96.4% |
| Wed 28 Oct | 25.28 | 23.69 | -6.3% | 1.54 | 0.06 | -96.1% |
| Tue 27 Oct | 37.50 | 35.72 | -4.7% | 1.74 | 0.13 | -92.5% |
| Mon 26 Oct | 27.39 | 25.98 | -5.1% | 1.36 | 0.13 | -90.4% |
| Sun 25 Oct | 27.91 | 33.13 | 18.7% | 2.94 | 1.73 | -41.2% |
Return on investment
Measured across everything on record (7 Apr 2025 to 7 Nov 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.
£18,990 put into FTSE All-World (VWRP.L) on 7 Apr 2025 and left alone would have been worth £27,315 on 6 Nov 2026 — a gain of £8,325. The system has handed back £4,529 over the same dates. That is the real closing price of a real fund, not an assumed rate; it is an accumulating class, so dividends are in it. No dealing costs and no tax, both of which would only make the fund look worse. The energy bills are already in this, which is the part that catches people out: £4,529 is not profit, it is the bill that did not arrive. Hold the money instead and you pay that bill in full — so the two sides are the financial benefit of each world over the same dates, with the electricity accounted for on both. Gains are compared with gains: an investment still has its £18,990 at the end and this system has hardware with a finite life instead. Two things the comparison leaves out, both of which favour the panels — these savings are not taxed, and they rise with the price of electricity. And 1.6 years is far too short a run for a stock market to mean much: this is what happened, not what tends to.
Left in a savings account at 4.50% instead, it would have earned £1,375 over the same period — the risk-free version of the same question. That rate is a sustained one rather than a headline best-buy: the base rate was 3.75% in October 2026 and the accounts paying a flat rate with no stepped bonus were around 4.3%. Interest on a balance this size runs close to the personal savings allowance, and past it for a higher-rate payer, which this does not deduct.