Why daytime electricity use matters for plug-in solar
Plug-In Solar Compare

Daytime electricity use: follow one hour of energy

The example assumes constant output and demand for one hour, no storage and ignores losses. It uses invented figures to show the calculation, not an actual customer's data. Repeat the reasoning with credible time-based estimates before drawing a conclusion about a year of savings.

[ ] Solar generated
0.40 kWh
Total energy produced in this example.
Notes: ______________________________

[ ] Used in the home
0.25 kWh
Replaces an import in this example.
Notes: ______________________________

[ ] Surplus
0.15 kWh
Not valued at the import tariff here.
Notes: ______________________________

[ ] Avoided purchase at 25p/kWh
6.25p
0.25 × 25p; excludes any export income.
Notes: ______________________________

A personal purchasing checklist, not confirmation of suitability, permission or safety.
Guide sources checked: 2026-09-06. Check current guidance and exact product information before purchase.


Read the full guide: https://pluginsolarcompare.co.uk/guides/solar-daytime-electricity-use