Off-Grid Solar Sizing Tool (V1)

1. What are you setting up?

Choose a starting setup, or build your own.

Starting setup

2. What will you power?

Tap an item to add it, then choose how heavily you use it.

Add something not listed

Name

Watts

Hours/day

3. Your conditions

Set the conditions the estimate should allow for.

When does the system need to work?

Where in the UK are you?

How long should the battery cope without useful solar?

4. Your recommendation

Your system

Solar

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Battery

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Inverter

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Daily use

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Choose a starting setup or add an appliance to begin sizing your system.

Your recommended system

Solar

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Battery

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Inverter

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Daily use

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What this system supports

Your selected appliances, with capacity buffers for real-world use.

Key assumptions

Conservative UK solar conditions, two days of battery autonomy, and standard system losses.

Show full system specification

Recommended specs

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Daily energy use (buffered)

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Charge controller (rough sizing)

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Battery capacity (Ah)

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If you're using Simple mode estimates, treat this as a planning figure — not a lab measurement.

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Advanced calculation settings

Battery chemistry

System voltage

Panel oversize factor

Simultaneous load

Want to build this system?

Solar System Estimator

1. What are you setting up?

2. What will you power?

Appliances 0 selected

3. Your conditions

4. Your recommendation

Matching solar kits and components