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Solar Self Consumption Calculator

Calculate what share of solar generation is used on site rather than exported.

About Solar Self Consumption Calculator

Self-consumption and self-sufficiency are different: the first measures what happens to the solar, the second what happens to the load. A battery raises both by shifting midday surplus into the evening. Self-consumption drives the economics wherever export payments are far below retail import prices, which is now the norm.

Formula

Solar Self Consumption

Self-consumption = solar used on site ÷ total solar generated

self-consumption
Share of generation used rather than exported
self-sufficiency
Share of consumption met by solar

Worked example

With the default values below, Solar Self Consumption Calculator returns Self-Consumption Rate of 24.23%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual solar generationminimum 0 kWh
6,500 kWh
Annual electricity consumptionminimum 0 kWh
4,500 kWh
Share of consumption during daylightaccepts 0–100 %
35 %
Battery capacityminimum 0 kWh
0 kWh

Results

Self-Consumption Rate
24.23%
Solar Used On Site
1,575.0 kWh
Solar Exported
4,925.0 kWh
Electricity Still Imported
2,925.0 kWh
Self-Sufficiency
35.00%

Step by step

  1. 1Values used
  2. 2Solar Self Consumption
  3. 3Self-Consumption Rate= 24.23
  4. 4Solar Used On Site= 1,575.0 kWh
  5. 5Solar Exported= 4,925.0 kWh
  6. 6Electricity Still Imported= 2,925.0 kWh
  7. 7Self-Sufficiency= 35.00

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Solar Self Consumption calculated?

Self-consumption = solar used on site ÷ total solar generated Self-consumption and self-sufficiency are different: the first measures what happens to the solar, the second what happens to the load. A battery raises both by shifting midday surplus into the evening.

Why does Solar Self Consumption matter?

Self-consumption drives the economics wherever export payments are far below retail import prices, which is now the norm.

What values do I need to enter?

This calculator takes 4 inputs: Annual solar generation, Annual electricity consumption, Share of consumption during daylight, Battery capacity. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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