Battery Size Optimiser

Compare a smaller and larger home battery to see whether the extra capacity produces enough additional annual saving.

Smaller battery usable capacity (kWh)Smaller battery installed cost (£)Larger battery usable capacity (kWh)Larger battery installed cost (£)Average energy available to shift each day (kWh)Value per shifted kWh (p/kWh)Round-trip efficiency (%)

Worked example

A 10 kWh battery is not automatically twice as valuable as a 5 kWh battery if your household only has 7 kWh/day available to shift.

Frequently asked questions

What does energy available to shift mean?

The typical cheap-rate or surplus solar energy you can realistically move each day.

Does this include power limits?

No.

Battery Size Optimiser

Worked example

Frequently asked questions

What does energy available to shift mean?

Does this include power limits?

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