Off-Grid Solar Sizing Tool (UK)

DIY-focused sizing for real-world use — conservative by default for UK conditions.

Step 1 of 4
Scenario

Start with a scenario (optional)

Swap in a curated appliance set plus sensible defaults for a typical scenario.

Add your appliances

Choose common items, then tweak watts/hours to match how you actually use power.
Tap an appliance to add it
Simple: Uses typical daily estimates (fast). Simple mode uses typical daily-use estimates. Use Expert if you want to match your exact watts/hours. Expert: Edit watts/hours/surge (advanced). Simple mode uses typical daily-use estimates. Use Expert if you want to match your exact watts/hours.
Add a custom item
Use this if you don’t see your appliance above.

Appliances

Your system

Your recommended system
Solar array
Battery capacity
Inverter size
WHAT TO BUY
Here are the closest off-the-shelf components that match your recommended system.
Closest matching ready-made kit
Why this recommendation works
This configuration is designed to support your selected appliances without running the system at its limits, and it’s also rounded to standard, readily available system sizes so you can buy off-the-shelf components.
Details (optional)
Show technical details & assumptions
Recommended specs
Daily energy use (buffered)
Charge controller (rough sizing)
Battery capacity (Ah)
If you're using Simple mode estimates, treat this as a planning figure — not a lab measurement.
Planning estimate based on conservative UK assumptions.

Adjust assumptions

Tune resilience, seasonal conditions, and system defaults before finalizing your plan.


Advanced settings