Answer three quick questions and we'll calculate your payback period, annual savings and 25-year return — personalised to your location and roof.
1
Your Energy
2
Your Roof
3
Your System
Step 1 of 3 · About 30 seconds
Your current energy costs
Upload a bill for instant results, or enter your details manually below.
Drop your bill here, or
JPG, PNG or PDF · max 5MB
⏳Reading your bill…
Found — check and adjust if needed
or enter manually
£/mo
p/kWh
Step 2 of 3 · About 20 seconds
Your location & roof
Solar output varies significantly by region and roof direction.
°
South — optimal generation
Step 3 of 3 · About 10 seconds
System size & cost
Adjust as you receive installer quotes — the cost is the biggest variable.
4 kWp
2 kWp · ~4 panels13 kWp · ~26 panels
£
£
kWh
Your battery can charge overnight at a cheap rate and discharge during the day instead of buying expensive electricity — this load-shifting saving is calculated separately from your solar benefit.
p/kWh
p/kWh
Defaults are based on Octopus Intelligent Go rates — adjust to match your tariff.
Annual savings
£—
bill reduction + export
Payback period
— yrs
break-even point
25-year profit
£—
after all costs
Payback timeline
Loading…
Install25 years
SEG rate assumed at 15p/kWh — check your supplier's current offer. Energy price rise of 3.5%/year applied to savings projection. Figures are estimates; an installer survey will provide a more accurate quote.
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Get quotes from MCS-certified installers near you — vetted, local, and free to contact.
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Free site survey included
Just one contact method needed — email or phone is fine.