But, is solar worth it?

Yes. Since installing solar I've saved ¥73,587 in electricity costs.

Here's a breakdown for each billing period since my installation.

May 15 ~ Jun 14

I consumed 208.61kWh and generated 250.41kWh.

This would have cost me ¥8,879 without solar.

My actual cost was ¥1,576.

I saved ¥7,304 with generation and earned ¥1,594 for a total savings of ¥8,899
Date Generation Consumption Bought Sold
2023/05/15 6.84 8.84 3.00 1.00
2023/05/16 17.63 12.13 2.90 8.40
2023/05/17 17.21 9.21 0.80 8.80
2023/05/18 16.96 9.46 0.70 8.20
2023/05/19 6.04 6.94 1.60 0.70
2023/05/20 6.54 7.04 1.70 1.20
2023/05/21 13.39 10.29 1.80 4.90
2023/05/22 13.63 11.23 1.10 3.50
2023/05/23 2.47 5.97 3.60 0.10
2023/05/24 17.64 12.04 1.90 7.50
2023/05/25 12.29 9.29 0.80 3.80
2023/05/26 12.83 8.43 0.60 5.00
2023/05/27 16.98 8.78 0.70 8.90
2023/05/28 14.28 8.18 0.80 6.90
2023/05/29 2.08 8.78 6.70 0.00
2023/05/30 8.37 9.87 2.40 0.90
2023/05/31 4.36 7.36 3.70 0.70
2023/06/01 13.27 10.97 1.60 3.90
2023/06/02 1.94 11.64 9.70 0.00
2023/06/03 10.42 5.42 2.20 7.20
2023/06/04 15.18 8.48 0.60 7.30
2023/06/05 13.63 10.63 0.80 3.80
2023/06/06 6.43 7.63 2.30 1.10
2023/06/07 0.00 0.00 0.00 0.00
2023/06/08 0.00 0.00 0.00 0.00
2023/06/09 0.00 0.00 0.00 0.00
2023/06/10 0.00 0.00 0.00 0.00
2023/06/11 0.00 0.00 0.00 0.00
2023/06/12 0.00 0.00 0.00 0.00
2023/06/13 0.00 0.00 0.00 0.00
2023/06/14 0.00 0.00 0.00 0.00

Apr 15 ~ May 14

I consumed 277.87kWh and generated 362.67kWh.

This would have cost me ¥10,184 without solar.

My actual cost was ¥1,969.

I saved ¥8,214 with generation and earned ¥2,476 for a total savings of ¥10,691
Date Generation Consumption Bought Sold
2023/04/15 1.88 3.18 1.50 0.20
2023/04/16 15.48 12.78 3.00 5.70
2023/04/17 12.45 10.75 1.10 2.80
2023/04/18 13.83 10.53 1.40 4.70
2023/04/19 13.21 10.31 1.70 4.60
2023/04/20 16.96 10.26 0.60 7.30
2023/04/21 15.47 8.77 0.50 7.20
2023/04/22 3.17 5.57 2.70 0.30
2023/04/23 10.87 10.37 2.20 2.70
2023/04/24 8.61 8.81 1.50 1.30
2023/04/25 8.76 9.86 2.10 1.00
2023/04/26 3.40 10.80 7.70 0.30
2023/04/27 18.43 12.43 2.70 8.70
2023/04/28 17.68 8.58 0.40 9.50
2023/04/29 16.18 9.28 0.90 7.80
2023/04/30 3.51 8.51 5.20 0.20
2023/05/01 13.24 11.44 2.70 4.50
2023/05/02 18.13 9.43 0.90 9.60
2023/05/03 17.71 9.61 0.80 8.90
2023/05/04 17.89 9.89 0.50 8.50
2023/05/05 18.06 9.76 0.90 9.20
2023/05/06 15.35 9.25 0.60 6.70
2023/05/07 2.19 6.09 4.20 0.30
2023/05/08 6.23 10.83 7.80 3.20
2023/05/09 18.45 11.75 1.40 8.10
2023/05/10 17.74 9.74 1.00 9.00
2023/05/11 13.35 10.65 1.70 4.40
2023/05/12 15.34 8.84 0.60 7.10
2023/05/13 3.66 3.66 0.80 0.80
2023/05/14 5.44 6.14 1.80 1.10

Mar 15 ~ Apr 14

I consumed 332.55kWh and generated 359.25kWh.

This would have cost me ¥12,042 without solar.

My actual cost was ¥3,194.

I saved ¥8,847 with generation and earned ¥2,081 for a total savings of ¥10,928
Date Generation Consumption Bought Sold
2023/03/15 16.12 10.22 1.70 7.60
2023/03/16 16.91 11.61 2.30 7.60
2023/03/17 6.29 10.39 4.80 0.70
2023/03/18 1.95 13.25 11.30 0.00
2023/03/19 17.67 14.07 4.60 8.20
2023/03/20 17.98 12.68 2.50 7.80
2023/03/21 6.49 9.89 4.20 0.80
2023/03/22 15.37 12.47 2.30 5.20
2023/03/23 2.49 7.09 4.80 0.20
2023/03/24 8.82 10.32 2.40 0.90
2023/03/25 2.30 6.70 4.70 0.30
2023/03/26 1.71 9.71 8.00 0.00
2023/03/27 8.64 11.24 3.70 1.10
2023/03/28 7.24 10.94 4.50 0.80
2023/03/29 12.80 12.40 2.90 3.30
2023/03/30 13.03 12.53 3.70 4.20
2023/03/31 8.11 7.71 1.00 1.40
2023/04/01 17.02 10.42 1.60 8.20
2023/04/02 7.95 8.75 2.00 1.20
2023/04/03 15.65 13.05 3.10 5.70
2023/04/04 17.23 13.23 2.10 6.10
2023/04/05 13.88 10.18 1.90 5.60
2023/04/06 12.83 9.43 0.90 4.30
2023/04/07 4.37 7.67 3.80 0.50
2023/04/08 9.08 10.78 2.80 1.10
2023/04/09 18.40 12.30 1.50 7.60
2023/04/10 18.65 11.65 1.60 8.60
2023/04/11 17.47 10.67 1.30 8.10
2023/04/12 13.67 9.97 1.30 5.00
2023/04/13 16.53 12.53 1.60 5.60
2023/04/14 12.63 8.73 0.80 4.70

Feb 15 ~ Mar 14

I consumed 322.37kWh and generated 354.87kWh.

This would have cost me ¥12,102 without solar.

My actual cost was ¥3,499.

I saved ¥8,603 with generation and earned ¥2,261 for a total savings of ¥10,864
Date Generation Consumption Bought Sold
2023/02/15 6.97 7.97 2.30 1.30
2023/02/16 16.61 8.31 0.80 9.10
2023/02/17 15.63 6.23 0.70 10.10
2023/02/18 15.30 6.40 0.70 9.60
2023/02/19 4.39 12.79 8.70 0.30
2023/02/20 15.31 13.31 3.80 5.80
2023/02/21 16.97 14.27 4.40 7.10
2023/02/22 16.54 16.44 6.50 6.60
2023/02/23 8.55 14.45 6.90 1.00
2023/02/24 3.62 12.32 9.10 0.40
2023/02/25 11.54 12.64 3.70 2.60
2023/02/26 17.09 14.79 5.20 7.50
2023/02/27 16.74 13.54 4.50 7.70
2023/02/28 17.10 15.70 3.90 5.30
2023/03/01 9.28 11.68 3.40 1.00
2023/03/02 11.01 10.21 3.10 3.90
2023/03/03 13.01 14.01 3.80 2.80
2023/03/04 15.55 11.25 1.40 5.70
2023/03/05 5.72 8.12 3.10 0.70
2023/03/06 11.68 12.58 3.80 2.90
2023/03/07 16.24 13.34 3.50 6.40
2023/03/08 16.39 12.39 2.50 6.50
2023/03/09 14.30 10.50 1.50 5.30
2023/03/10 15.72 10.22 2.30 7.80
2023/03/11 16.13 9.63 0.80 7.30
2023/03/12 10.07 7.77 0.80 3.10
2023/03/13 3.99 8.69 5.20 0.50
2023/03/14 13.45 12.85 4.10 4.70

Jan 15 ~ Feb 14

I consumed 389.96kWh and generated 266.96kWh.

This would have cost me ¥15,424 without solar.

My actual cost was ¥9,967.

I saved ¥5,456 with generation and earned ¥1,312 for a total savings of ¥6,769
Date Generation Consumption Bought Sold
2023/01/15 0.81 11.21 10.40 0.00
2023/01/16 0.60 14.20 13.60 0.00
2023/01/17 5.03 17.23 12.80 0.60
2023/01/18 6.27 16.27 10.50 0.50
2023/01/19 4.83 14.43 10.30 0.70
2023/01/20 14.02 14.02 2.70 2.70
2023/01/21 7.22 14.02 7.70 0.90
2023/01/22 11.09 16.49 6.60 1.20
2023/01/23 3.39 15.59 12.60 0.40
2023/01/24 7.83 16.33 9.40 0.90
2023/01/25 15.05 25.15 12.10 2.00
2023/01/26 14.74 21.54 10.60 3.80
2023/01/27 4.61 18.91 14.70 0.40
2023/01/28 12.73 14.93 4.90 2.70
2023/01/29 13.13 16.93 4.80 1.00
2023/01/30 15.06 19.86 8.70 3.90
2023/01/31 10.18 16.38 7.60 1.40
2023/02/01 12.38 18.58 8.70 2.50
2023/02/02 5.10 15.60 11.00 0.50
2023/02/03 3.58 10.48 7.50 0.60
2023/02/04 12.85 9.65 2.00 5.20
2023/02/05 14.11 5.91 0.80 9.00
2023/02/06 13.64 6.14 0.80 8.30
2023/02/07 8.13 5.33 0.80 3.60
2023/02/08 4.56 4.56 0.90 0.90
2023/02/09 14.49 6.49 0.70 8.70
2023/02/10 0.90 2.40 1.50 0.00
2023/02/11 15.76 9.66 1.90 8.00
2023/02/12 10.86 5.56 0.80 6.10
2023/02/13 1.03 2.03 1.10 0.10
2023/02/14 3.00 4.10 1.70 0.60

Dec 15 ~ Jan 14

I consumed 476.55kWh and generated 347.75kWh.

This would have cost me ¥19,129 without solar.

My actual cost was ¥10,114.

I saved ¥9,016 with generation and earned ¥1,458 for a total savings of ¥10,474
Date Generation Consumption Bought Sold
2022/12/15 11.99 14.99 6.20 3.40
2022/12/16 12.98 14.08 5.90 4.90
2022/12/17 3.16 15.16 12.10 0.20
2022/12/18 12.28 15.18 5.70 3.10
2022/12/19 14.05 18.95 8.60 4.00
2022/12/20 13.12 18.12 8.50 3.60
2022/12/21 5.64 15.24 9.80 0.50
2022/12/22 2.99 12.69 7.20 0.40
2022/12/23 14.40 14.00 4.20 5.20
2022/12/24 13.60 16.30 4.90 2.20
2022/12/25 12.67 14.47 4.40 2.60
2022/12/26 13.34 15.84 6.80 4.30
2022/12/27 13.68 17.18 6.50 3.00
2022/12/28 11.98 14.48 5.30 2.80
2022/12/29 13.08 8.58 1.10 5.60
2022/12/30 10.35 14.45 5.30 1.20
2022/12/31 4.23 13.73 10.30 0.80
2023/01/01 13.69 16.19 7.60 5.10
2023/01/02 10.96 16.96 7.10 1.10
2023/01/03 13.24 16.34 6.20 3.10
2023/01/04 12.98 16.98 7.40 3.40
2023/01/05 13.30 18.60 8.40 3.10
2023/01/06 10.75 15.15 6.50 2.10
2023/01/07 12.78 15.58 5.60 2.80
2023/01/08 13.02 16.12 6.00 2.90
2023/01/09 13.22 14.72 5.30 3.80
2023/01/10 14.02 15.52 5.70 4.20
2023/01/11 12.42 18.52 8.00 1.90
2023/01/12 12.61 18.51 8.10 2.20
2023/01/13 10.26 12.26 4.30 2.30
2023/01/14 0.99 11.69 10.70 0.00

Nov 15 ~ Dec 14

I consumed 378.59kWh and generated 249.79kWh.

This would have cost me ¥14,522 without solar.

My actual cost was ¥9,446.

I saved ¥5,076 with generation and earned ¥986 for a total savings of ¥6,061
Date Generation Consumption Bought Sold
2022/11/15 3.96 10.76 7.00 0.70
2022/11/16 13.95 13.16 3.30 4.40
2022/11/17 10.96 12.56 3.10 1.50
2022/11/18 12.87 14.77 3.10 1.70
2022/11/19 13.49 13.59 3.40 3.30
2022/11/20 2.33 10.83 8.40 0.30
2022/11/21 6.98 11.48 4.60 1.00
2022/11/22 12.36 11.96 3.60 4.00
2022/11/23 0.61 11.71 10.90 0.00
2022/11/24 12.35 11.85 3.20 3.70
2022/11/25 13.33 10.43 2.20 5.10
2022/11/26 5.01 10.21 5.80 0.90
2022/11/27 13.46 11.56 2.70 4.80
2022/11/28 3.12 10.72 7.70 0.40
2022/11/29 3.25 10.35 7.60 0.60
2022/11/30 3.63 10.23 7.00 0.60
2022/12/01 1.23 10.93 9.50 0.00
2022/12/02 5.16 12.46 8.00 1.00
2022/12/03 7.84 12.24 5.30 1.00
2022/12/04 7.92 13.52 6.40 0.90
2022/12/05 1.66 13.66 11.70 0.00
2022/12/06 4.28 14.28 10.40 0.60
2022/12/07 12.48 16.58 6.40 2.40
2022/12/08 12.94 14.84 5.40 3.50
2022/12/09 10.09 12.89 5.20 2.60
2022/12/10 13.00 13.90 4.80 3.90
2022/12/11 8.62 12.82 5.10 1.00
2022/12/12 13.30 15.70 5.60 3.30
2022/12/13 6.47 14.37 8.50 0.90
2022/12/14 13.15 14.25 5.00 3.90

Oct 15 ~ Nov 14

I consumed 291.31kWh and generated 282.76kWh.

This would have cost me ¥10,503 without solar.

My actual cost was ¥3,074.

I saved ¥7,428 with generation and earned ¥1,473 for a total savings of ¥8,901
Date Generation Consumption Bought Sold
2022/10/15 0.00 0.00 0.00 0.00
2022/10/16 0.00 0.00 0.00 0.00
2022/10/17 0.00 0.00 0.00 0.00
2022/10/18 2.25 6.20 4.40 0.45
2022/10/19 6.16 8.96 3.60 0.80
2022/10/20 15.93 11.63 2.20 6.50
2022/10/21 14.66 10.86 1.30 5.10
2022/10/22 4.25 7.45 3.80 0.60
2022/10/23 14.57 9.77 1.70 6.50
2022/10/24 4.61 8.51 4.60 0.70
2022/10/25 2.38 10.68 8.50 0.20
2022/10/26 15.72 12.72 3.80 6.80
2022/10/27 11.00 12.10 2.60 1.50
2022/10/28 4.59 7.59 3.90 0.90
2022/10/29 14.46 11.56 2.70 5.60
2022/10/30 13.00 11.70 2.30 3.70
2022/10/31 15.13 10.63 2.10 6.60
2022/11/01 3.37 9.17 6.20 0.50
2022/11/02 14.38 12.28 2.50 4.60
2022/11/03 14.71 10.21 1.50 6.10
2022/11/04 13.12 11.82 2.50 3.80
2022/11/05 7.06 9.46 2.90 0.90
2022/11/06 13.79 10.39 2.50 6.00
2022/11/07 6.72 11.22 5.10 0.90
2022/11/08 14.07 12.47 2.80 4.50
2022/11/09 10.96 10.46 2.20 2.70
2022/11/10 9.54 9.94 2.20 1.80
2022/11/11 13.29 11.59 1.80 3.50
2022/11/12 12.71 10.31 2.00 4.40
2022/11/13 6.61 10.71 4.60 0.60
2022/11/14 3.75 10.95 7.30 0.40

Made by James Van Dyne.