energy - Andre Rozendaal

Energy prices are rising quickly, so having clear insight into your consumption is essential.
Below is my energy usage and system configuration.

🏠 Home and Energy System

I live in a house built in 1908 with gas-powered central heating.

🔧 Upgrades and Installations

2021 – Sunpower solar panels
10 × Sunpower P3-380-BLK panels facing south, connected to an SMA Sunny Boy 3.0 inverter.
2023 – Major renovation
Added extra insulation between floors and installed new windows.
2023 – Air conditioners
Installed 3 air conditioners: 2 for the bedrooms and 1 for the living room/kitchen.
2024 – Eurener solar panels
6 × Eurener 410 Wp panels facing east/west, with an AP Systems inverter.
2025 – Home battery
2.7 kWh HomeWizard battery with an 800-watt inverter.
2025 – HR++ glass
Replaced old double-glazed windows with HR++ glass.

⚡ Definitions and Measurements

Energy from grid (kWh):
The electricity consumed from the energy provider.
Energy to grid (kWh):
The electricity fed back into the grid.
Solar (kWh):
Solar production used directly in the home or exported to the grid when not needed.
Water (m³):
Our household water consumption in cubic meters.

🔄 Net Metering and Future

Until 2027, electricity sent back to the grid can be used later through net metering.
After 2027, depending on energy prices, a battery becomes even more useful.

Self-Sufficiency (2026)

31.6%

PV Self-Consumption (2026)

48.2%

Solar Produced YTD

5133 kWh

Battery Efficiency (2026)

75.8%

Yearly Totals

year	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	water (m3)	bat_import	bat_export	Battery Efficiency (%)	PV Self Consumption (%)	Electricity Self Sufficiency (%)
2026	2690	2659	108	5133	73	648	491	75.8	48.2	31.6
2025	3945	3118	223	6410	105	829	626	75.5	51.4	31.8
2024	5165	3422	185	5525	94	0	0	NaN	38.1	19.7
2023	3923	2511	572	3878	23	0	0	NaN	35.3	17.5
2022	3131	3132	763	4438	0	0	0	NaN	29.4	17.3
2021	4214	63	1148	127	0	0	0	NaN	50.4	1.5
2020	2776	0	493	0	0	0	0	NaN	NaN	0.0

Monthly Breakdown

2026

date	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	water (l)	bat_import	bat_export	battery efficiency (%)
Sep-2026	4.5	0.4	0.0	2.2	51	1.1	0.0	0.0
Aug-2026	247.3	381.6	6.1	779.2	9235	97.9	75.0	76.6
Jul-2026	96.0	582.9	3.1	896.7	6386	95.9	71.9	75.0
Jun-2026	206.9	411.5	8.4	844.2	10462	99.3	76.1	76.6
May-2026	176.8	453.7	8.0	861.8	10426	109.4	83.9	76.7
Apr-2026	194.0	517.5	9.1	857.8	9182	94.1	71.4	75.9
Mar-2026	329.6	247.3	11.2	553.0	9592	88.3	67.7	76.7
Feb-2026	603.3	46.0	13.0	223.0	8669	36.6	27.1	74.0
Jan-2026	832.0	18.0	49.0	115.0	8819	24.9	18.4	73.9

date	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	water (l)	battery efficiency (%)
Dec-2025	602.0	7.0	43.0	107.0	8552	NaN
Nov-2025	485.0	32.0	23.0	176.0	8179	NaN
Oct-2025	406.0	68.0	6.0	258.0	8443	NaN
Sep-2025	226.0	287.0	5.0	560.0	8546	NaN
Aug-2025	120.0	497.0	5.0	779.0	7360	NaN
Jul-2025	89.0	162.0	2.0	831.0	9661	NaN
Jun-2025	146.0	465.0	9.0	871.0	9861	NaN
May-2025	95.0	583.0	7.0	919.0	9097	NaN
Apr-2025	116.0	528.0	9.0	825.0	9028	NaN
Mar-2025	236.0	357.0	12.0	690.0	8561	NaN
Feb-2025	609.0	98.0	48.0	269.0	8290	NaN
Jan-2025	815.0	34.0	54.0	125.0	9379	NaN

date	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	water (l)	battery efficiency (%)
Dec-2024	737.0	10.0	44.0	52.0	8386	NaN
Nov-2024	620.0	66.0	11.0	168.0	8595	NaN
Oct-2024	417.0	169.0	7.0	339.0	8381	NaN
Sep-2024	349.0	364.0	5.0	563.0	7420	NaN
Aug-2024	227.0	583.0	5.0	812.0	7380	NaN
Jul-2024	197.0	610.0	4.0	812.0	6387	NaN
Jun-2024	208.0	510.0	3.0	806.0	8031	NaN
May-2024	220.0	526.0	4.0	779.0	7495	NaN
Apr-2024	310.0	359.0	9.0	617.0	8488	NaN
Mar-2024	458.0	165.0	8.0	346.0	8250	NaN
Feb-2024	630.0	24.0	22.0	106.0	7673	NaN
Jan-2024	792.0	36.0	63.0	125.0	7722	NaN

date	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	water (l)	battery efficiency (%)
Dec-2023	692.0	10.0	40.0	48.0	7682	NaN
Nov-2023	562.0	29.0	30.0	98.0	7284	NaN
Oct-2023	419.0	88.0	4.0	197.0	7672	NaN
Sep-2023	275.0	230.0	5.0	402.0	0	NaN
Aug-2023	190.0	275.0	3.0	461.0	0	NaN
Jul-2023	203.0	354.0	6.0	501.0	0	NaN
Jun-2023	196.0	455.0	8.0	646.0	0	NaN
May-2023	183.0	408.0	12.0	547.0	0	NaN
Apr-2023	215.0	320.0	52.0	434.0	0	NaN
Mar-2023	274.0	174.0	104.0	268.0	0	NaN
Feb-2023	283.0	123.0	131.0	185.0	0	NaN
Jan-2023	431.0	45.0	177.0	91.0	0	NaN

date	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	battery efficiency (%)
Dec-2022	393.0	44.0	182.0	80.0	NaN
Nov-2022	364.0	73.0	59.0	154.0	NaN
Oct-2022	287.0	163.0	7.0	263.0	NaN
Sep-2022	222.0	277.0	4.0	395.0	NaN
Aug-2022	201.0	416.0	4.0	567.0	NaN
Jul-2022	189.0	438.0	4.0	593.0	NaN
Jun-2022	186.0	426.0	4.0	582.0	NaN
May-2022	189.0	414.0	12.0	571.0	NaN
Apr-2022	210.0	354.0	61.0	469.0	NaN
Mar-2022	227.0	374.0	73.0	508.0	NaN
Feb-2022	292.0	119.0	148.0	188.0	NaN
Jan-2022	371.0	34.0	205.0	68.0	NaN

date	energy from grid (kwh)	energy to grid (kwh)	gas (m3)	solar (kwh)	battery efficiency (%)
Dec-2021	354.0	33.0	216.0	64.0	NaN
Nov-2021	349.0	30.0	154.0	63.0	NaN
Oct-2021	380.0	0.0	55.0	0.0	NaN
Sep-2021	350.0	0.0	8.0	0.0	NaN
Aug-2021	335.0	0.0	7.0	0.0	NaN
Jul-2021	270.0	0.0	5.0	0.0	NaN
Jun-2021	382.0	0.0	4.0	0.0	NaN
May-2021	373.0	0.0	50.0	0.0	NaN
Apr-2021	225.0	0.0	60.0	0.0	NaN
Mar-2021	388.0	0.0	152.0	0.0	NaN
Feb-2021	373.0	0.0	186.0	0.0	NaN
Jan-2021	435.0	0.0	251.0	0.0	NaN

date	energy from grid (kwh)	gas (m3)	battery efficiency (%)
Dec-2020	418.0	216.0	NaN
Nov-2020	345.0	134.0	NaN
Oct-2020	386.0	82.0	NaN
Sep-2020	328.0	9.0	NaN
Aug-2020	378.0	7.0	NaN
Jul-2020	286.0	7.0	NaN
Jun-2020	306.0	11.0	NaN
May-2020	329.0	27.0	NaN

Last updated: September 01, 2026