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Hybrid Solar System Calculator

Size a hybrid solar system with battery and grid backup.

About Hybrid Solar System Calculator

A hybrid system sizes the array on annual energy and the battery on the evening load it must time-shift. That typically lifts self-sufficiency from around 35 per cent to 70 or more. Batteries rarely reach full self-sufficiency because winter generation is far below consumption, which is why the grid connection is retained.

Formula

Hybrid Solar System

Array sized on annual consumption; battery sized on the evening load it must shift

self-sufficiency
Share of consumption met from solar, directly or via the battery

Worked example

With the default values below, Hybrid Solar System Calculator returns Array Size of 4.773. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual consumptionminimum 0 kWh
5,000 kWh
Average peak sun hoursaccepts 0.1–12 h
3.5 h
Evening and night consumptionminimum 0 kWh
6 kWh
Battery depth of dischargeaccepts 0–100 %
90 %
System lossesaccepts 0–100 %
18 %
Import price per kWhminimum 0
0.25

Results

Array Size
4.773 kW
Battery Capacity
6.667 kWh
Estimated Self-Sufficiency
71.0%
Estimated Annual Saving
$887.50
Annual Generation
5,000.0 kWh

Step by step

  1. 1Values used
  2. 2Hybrid Solar System
  3. 3Array Size= 4.773 kW
  4. 4Battery Capacity= 6.667 kWh
  5. 5Estimated Self-Sufficiency= 71.0
  6. 6Estimated Annual Saving= 887.50
  7. 7Annual Generation= 5,000.0 kWh

Assumptions and limits

  • The result is derived only from the 6 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or tax into account.
  • Figures are rounded for display to 3 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 Hybrid Solar System calculated?

Array sized on annual consumption; battery sized on the evening load it must shift A hybrid system sizes the array on annual energy and the battery on the evening load it must time-shift. That typically lifts self-sufficiency from around 35 per cent to 70 or more.

Why does Hybrid Solar System matter?

Batteries rarely reach full self-sufficiency because winter generation is far below consumption, which is why the grid connection is retained.

What values do I need to enter?

This calculator takes 6 inputs: Annual consumption, Average peak sun hours, Evening and night consumption, Battery depth of discharge, System losses, Import price per kWh. 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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