Solar self-consumption · half-hourly model
Solar Matching
How much of your home's electric, heat-pump and EV demand can be met directly by solar and a battery — and what it costs on a flat-rate or Agile (half-hourly) tariff.
Monthly demand & generation Power view kWh · click a month to zoom in watts · drag to select a range
PV Solar & battery
HP Demand & heat pump
EV Electric vehicle
Using measured half-hourly EV charging data from the monitored home.
£ Tariff rates
Annual cost
flat-rate vs agile| Flat-rate tariff | |
| Import @ {{ import_rate }}p | £{{ (annual.import_kwh*import_rate*0.01) | toFixed(0) }} |
| Export credit @ {{ export_rate }}p | −£{{ (annual.export_kwh*export_rate*0.01) | toFixed(0) }} |
| Flat-rate net | £{{ annual.cost | toFixed(0) }} |
| Agile (half-hourly) tariff | |
| Import cost | £{{ annual.agile_import_cost | toFixed(0) }} |
| Export earnings | −£{{ annual.agile_export_earnings | toFixed(0) }} |
| Agile net | £{{ annual.agile_cost | toFixed(0) }} |
Agile net £{{ annual.agile_cost | toFixed(0) }} vs flat-rate £{{ annual.cost | toFixed(0) }} — a {{ (annual.cost - annual.agile_cost) | toFixed(0) }} £ difference. Avg agile import {{ annual.avg_agile_import_rate | toFixed(1) }}p (inc. VAT), export {{ annual.avg_agile_export_rate | toFixed(1) }}p per kWh.
Electricity flows
| Total demand | {{ annual.demand_kwh | toFixed(0) }} kWh |
| Solar generated | {{ annual.solar_kwh | toFixed(0) }} kWh |
| self-used ({{ annual.prc_self_consumption | toFixed(0) }}%) | {{ (annual.solar_kwh - annual.export_kwh) | toFixed(0) }} kWh |
| exported | {{ annual.export_kwh | toFixed(0) }} kWh |
| Grid import | {{ annual.import_kwh | toFixed(0) }} kWh |
{{ annual.prc_self_consumption | toFixed(0) }}% of your solar is used at home. Adding load or battery capacity pushes this up — every self-consumed kWh avoids the {{ import_rate }}p import rate versus {{ export_rate }}p if exported.
Monthly breakdown
| Month | Solar | Demand | Import | Export | From solar | Agile imp | Agile exp | Agile net | Flat net |
|---|---|---|---|---|---|---|---|---|---|
| {{month.month}} | {{month.solar_kwh | toFixed(0)}} | {{month.demand_kwh | toFixed(0)}} | {{month.import_kwh | toFixed(0)}} | {{month.export_kwh | toFixed(0)}} | {{100 * (month.demand_kwh - month.import_kwh) / month.demand_kwh | toFixed(0)}}% | £{{month.agile_import_cost | toFixed(2)}} | £{{month.agile_export_earnings | toFixed(2)}} | £{{month.agile_cost | toFixed(2)}} | £{{month.flat_cost | toFixed(2)}} |
| Total | {{annual.solar_kwh | toFixed(0)}} | {{annual.demand_kwh | toFixed(0)}} | {{annual.import_kwh | toFixed(0)}} | {{annual.export_kwh | toFixed(0)}} | {{100 * (annual.demand_kwh - annual.import_kwh) / annual.demand_kwh | toFixed(0)}}% | £{{annual.agile_import_cost | toFixed(2)}} | £{{annual.agile_export_earnings | toFixed(2)}} | £{{annual.agile_cost | toFixed(2)}} | £{{annual.cost | toFixed(2)}} |